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2016-11-17selftests/x86: Add test_vdso to test getcpu()Andy Lutomirski
I'll eventually add tests for more vDSO functions here. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Megha <megha.dey@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/945cd29901a62a3cc6ea7d6ee5e389ab1ec1ac0c.1479320367.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-10-10Merge branch 'mm-pkeys-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull protection keys syscall interface from Thomas Gleixner: "This is the final step of Protection Keys support which adds the syscalls so user space can actually allocate keys and protect memory areas with them. Details and usage examples can be found in the documentation. The mm side of this has been acked by Mel" * 'mm-pkeys-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/pkeys: Update documentation x86/mm/pkeys: Do not skip PKRU register if debug registers are not used x86/pkeys: Fix pkeys build breakage for some non-x86 arches x86/pkeys: Add self-tests x86/pkeys: Allow configuration of init_pkru x86/pkeys: Default to a restrictive init PKRU pkeys: Add details of system call use to Documentation/ generic syscalls: Wire up memory protection keys syscalls x86: Wire up protection keys system calls x86/pkeys: Allocation/free syscalls x86/pkeys: Make mprotect_key() mask off additional vm_flags mm: Implement new pkey_mprotect() system call x86/pkeys: Add fault handling for PF_PK page fault bit
2016-09-13selftests/x86/sigreturn: Use CX, not AX, as the scratch registerAndy Lutomirski
RAX is handled specially in ESPFIX64. Use CX as our scratch register so that, if something goes wrong with RAX handling, we'll notice. Signed-off-by: Andy Lutomirski <luto@kernel.org> Reviewed-by: Borislav Petkov <bp@suse.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/9ceeb24ea56925586c330dc46306f757ddea9fb5.1473717910.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-09-09x86/pkeys: Add self-testsDave Hansen
This code should be a good demonstration of how to use the new system calls as well as how to use protection keys in general. This code shows how to: 1. Manipulate the Protection Keys Rights User (PKRU) register 2. Set a protection key on memory 3. Fetch and/or modify PKRU from the signal XSAVE state 4. Read the kernel-provided protection key in the siginfo 5. Set up an execute-only mapping There are currently 13 tests: test_read_of_write_disabled_region test_read_of_access_disabled_region test_write_of_write_disabled_region test_write_of_access_disabled_region test_kernel_write_of_access_disabled_region test_kernel_write_of_write_disabled_region test_kernel_gup_of_access_disabled_region test_kernel_gup_write_to_write_disabled_region test_executing_on_unreadable_memory test_ptrace_of_child test_pkey_syscalls_on_non_allocated_pkey test_pkey_syscalls_bad_args test_pkey_alloc_exhaust Each of the tests is run with plain memory (via mmap(MAP_ANON)), transparent huge pages, and hugetlb. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Cc: linux-arch@vger.kernel.org Cc: Dave Hansen <dave@sr71.net> Cc: mgorman@techsingularity.net Cc: arnd@arndb.de Cc: linux-api@vger.kernel.org Cc: shuahkh@osg.samsung.com Cc: linux-mm@kvack.org Cc: luto@kernel.org Cc: akpm@linux-foundation.org Cc: torvalds@linux-foundation.org Link: http://lkml.kernel.org/r/20160729163024.FC5A0C2D@viggo.jf.intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2016-09-08selftests/x86: Fix spelling mistake "preseve" -> "preserve"Colin Ian King
Trivial fix to spelling mistakes in printf messages. Signed-off-by: Colin Ian King <colin.king@canonical.com> Acked-by: Andy Lutomirski <luto@kernel.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kselftest@vger.kernel.org Link: http://lkml.kernel.org/r/20160828105106.9763-1-colin.king@canonical.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-07-15Merge branch 'x86/asm' into x86/mm, to resolve conflictsIngo Molnar
Conflicts: tools/testing/selftests/x86/Makefile Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-07-08selftests/x86: Add vDSO mremap() testDmitry Safonov
Should print this on vDSO remapping success (on new kernels): [root@localhost ~]# ./test_mremap_vdso_32 AT_SYSINFO_EHDR is 0xf773f000 [NOTE] Moving vDSO: [f773f000, f7740000] -> [a000000, a001000] [OK] Or print that mremap() for vDSOs is unsupported: [root@localhost ~]# ./test_mremap_vdso_32 AT_SYSINFO_EHDR is 0xf773c000 [NOTE] Moving vDSO: [0xf773c000, 0xf773d000] -> [0xf7737000, 0xf7738000] [FAIL] mremap() of the vDSO does not work on this kernel! Suggested-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com> Acked-by: Andy Lutomirski <luto@kernel.org> Cc: 0x7f454c46@gmail.com Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kselftest@vger.kernel.org Cc: linux-mm@kvack.org Link: http://lkml.kernel.org/r/20160628113539.13606-3-dsafonov@virtuozzo.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-06-14x86/mpx, selftests: Add MPX self testDave Hansen
I've had this code for a while, but never submitted it upstream. Now that Skylake hardware is out in the wild, folks can actually run this for real. It tests the following: 1. The MPX hardware is enabled by the kernel and doing what it is supposed to 2. The MPX management code is present and enabled in the kernel 3. MPX Signal handling 4. The MPX bounds table population code (on-demand population) 5. The MPX bounds table unmapping code (kernel-initiated freeing when unused) This has also caught bugs in the XSAVE code because MPX state is saved/restored with XSAVE. I'm submitting it now because it would have caught the recent issues with the compat_siginfo code not being properly augmented when new siginfo state is added. Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave@sr71.net> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20160608172535.5B40B0EE@viggo.jf.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-04-29selftests/x86/ldt_gdt: Test set_thread_area() deletion of an active segmentAndy Lutomirski
Now that set_thread_area() is supposed to give deterministic behavior when it modifies in-use segments, test it. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/f2bc11af1ee1a0f815ed910840cbdba06b640a20.1461698311.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-04-13selftests/x86: Test the FSBASE/GSBASE API and context switchingAndy Lutomirski
This catches two distinct bugs in the current code. I'll fix them. Signed-off-by: Andy Lutomirski <luto@kernel.org> Reviewed-by: Borislav Petkov <bp@suse.de> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rudolf Marek <r.marek@assembler.cz> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/7e5941148d1e2199f070dadcdf7355959f5f8e85.1460075211.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-03-17selftests/x86: Add an iopl testAndy Lutomirski
This exercises two cases that are known to be buggy on Xen PV right now. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andrew Cooper <andrew.cooper3@citrix.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: David Vrabel <david.vrabel@citrix.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Jan Beulich <JBeulich@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/61afe904c95c92abb29cd075b51e10e7feb0f774.1458162709.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-03-10selftests/x86: In syscall_nt, test NT|TF as wellAndy Lutomirski
Setting TF prevents fastpath returns in most cases, which causes the test to fail on 32-bit kernels because 32-bit kernels do not, in fact, handle NT correctly on SYSENTER entries. The next patch will fix 32-bit kernels. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andrew Cooper <andrew.cooper3@citrix.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/bd4bb48af6b10c0dc84aec6dbcf487ed25683495.1457578375.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-02-17selftests/x86: Add a test for syscall restart under ptraceAndy Lutomirski
This catches a regression from the compat syscall rework. The 32-bit variant of this test currently fails. The issue is that, for a 32-bit tracer and a 32-bit tracee, GETREGS+SETREGS with no changes should be a no-op. It currently isn't a no-op if RAX indicates signal restart, because the high bits get cleared and the kernel loses track of the restart state. Reported-by: Robert O'Callahan <robert@ocallahan.org> Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/c4040b40b5b4a37ed31375a69b683f753ec6788a.1455142412.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-02-17selftests/x86: Fix some error messages in ptrace_syscallAndy Lutomirski
I had some obvious typos. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Robert O'Callahan <robert@ocallahan.org> Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/e5e6772d4802986cf7df702e646fa24ac14f2204.1455142412.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-02-17selftests/x86: Add tests for UC_SIGCONTEXT_SS and UC_STRICT_RESTORE_SSAndy Lutomirski
This tests the two ABI-preserving cases that DOSEMU cares about, and it also explicitly tests the new UC_SIGCONTEXT_SS and UC_STRICT_RESTORE_SS flags. Signed-off-by: Andy Lutomirski <luto@kernel.org> Acked-by: Borislav Petkov <bp@alien8.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Brian Gerst <brgerst@gmail.com> Cc: Cyrill Gorcunov <gorcunov@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Stas Sergeev <stsp@list.ru> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/f3d08f98541d0bd3030ceb35e05e21f59e30232c.1455664054.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-02-17x86/signal/64: Re-add support for SS in the 64-bit signal contextAndy Lutomirski
This is a second attempt to make the improvements from c6f2062935c8 ("x86/signal/64: Fix SS handling for signals delivered to 64-bit programs"), which was reverted by 51adbfbba5c6 ("x86/signal/64: Add support for SS in the 64-bit signal context"). This adds two new uc_flags flags. UC_SIGCONTEXT_SS will be set for all 64-bit signals (including x32). It indicates that the saved SS field is valid and that the kernel supports the new behavior. The goal is to fix a problems with signal handling in 64-bit tasks: SS wasn't saved in the 64-bit signal context, making it awkward to determine what SS was at the time of signal delivery and making it impossible to return to a non-flat SS (as calling sigreturn clobbers SS). This also made it extremely difficult for 64-bit tasks to return to fully-defined 16-bit contexts, because only the kernel can easily do espfix64, but sigreturn was unable to set a non-flag SS:ESP. (DOSEMU has a monstrous hack to partially work around this limitation.) If we could go back in time, the correct fix would be to make 64-bit signals work just like 32-bit signals with respect to SS: save it in signal context, reset it when delivering a signal, and restore it in sigreturn. Unfortunately, doing that (as I tried originally) breaks DOSEMU: DOSEMU wouldn't reset the signal context's SS when clearing the LDT and changing the saved CS to 64-bit mode, since it predates the SS context field existing in the first place. This patch is a bit more complicated, and it tries to balance a bunch of goals. It makes most cases of changing ucontext->ss during signal handling work as expected. I do this by special-casing the interesting case. On sigreturn, ucontext->ss will be honored by default, unless the ucontext was created from scratch by an old program and had a 64-bit CS (unfortunately, CRIU can do this) or was the result of changing a 32-bit signal context to 64-bit without resetting SS (as DOSEMU does). For the benefit of new 64-bit software that uses segmentation (new versions of DOSEMU might), the new behavior can be detected with a new ucontext flag UC_SIGCONTEXT_SS. To avoid compilation issues, __pad0 is left as an alias for ss in ucontext. The nitty-gritty details are documented in the header file. This patch also re-enables the sigreturn_64 and ldt_gdt_64 selftests, as the kernel change allows both of them to pass. Tested-by: Stas Sergeev <stsp@list.ru> Signed-off-by: Andy Lutomirski <luto@kernel.org> Acked-by: Borislav Petkov <bp@alien8.de> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Brian Gerst <brgerst@gmail.com> Cc: Cyrill Gorcunov <gorcunov@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/749149cbfc3e75cd7fcdad69a854b399d792cc6f.1455664054.git.luto@kernel.org [ Small readability edit. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-01-29selftests/x86: Add check_initial_reg_state()Andy Lutomirski
This checks that ELF binaries are started with an appropriately blank register state. ( There's currently a nasty special case in the entry asm to arrange for this. I'm planning on removing the special case, and this will help make sure I don't break it. ) Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/ef54f8d066b30a3eb36bbf26300eebb242185700.1454022279.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-01-29selftests/x86: Extend Makefile to allow 64-bit-only testsAndy Lutomirski
Previously the Makefile supported 32-bit-only tests and tests that were 32-bit and 64-bit. This adds the support for tests that are only built as 64-bit binaries. There aren't any yet, but there might be a few some day. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shuah Khan <shuahkhan@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-api@vger.kernel.org Link: http://lkml.kernel.org/r/99789bfe65706e6df32cc7e13f656e8c9fa92031.1454022279.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-01-13selftests/x86: Test __kernel_sigreturn and __kernel_rt_sigreturnAndy Lutomirski
The vdso-based sigreturn mechanism is fragile and isn't used by modern glibc so, if we break it, we'll only notice when someone tests an unusual libc. Add an explicit selftest. [ I wrote this while debugging a Bionic breakage -- my first guess was that I had somehow messed up sigreturn. I've caused problems in that code before, and it's really easy to fail to notice it because there's nothing on a modern distro that needs vdso-based sigreturn. ] Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/32946d714156879cd8e5d8eab044cd07557ed558.1452628504.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2016-01-12selftests/x86: Disable the ldt_gdt_64 test for nowAndy Lutomirski
ldt_gdt.c relies on cross-cpu invalidation of SS to do one of its tests. On 32-bit builds, this works fine, but on 64-bit builds, it only works if the kernel has proper SS sigcontext handling for 64-bit user programs. Since the SS fixes are currently reverted, restrict the test case to 32 bits for now. In principle, I could change the test to use a different segment register, but it would be messy: CS can't point to the LDT for 64-bit code, and the other registers don't result in immediate faults because they aren't reloaded on kernel -> user transitions. When we fix sigcontext (in 4.6?), we can revert this. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/231591d9122d282402d8f53175134f8db5b3bc73.1452561752.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-11-03Merge branch 'x86-fpu-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 fpu changes from Ingo Molnar: "There are two main areas of changes: - Rework of the extended FPU state code to robustify the kernel's usage of cpuid provided xstate sizes - and related changes (Dave Hansen)" - math emulation enhancements: new modern FPU instructions support, with testcases, plus cleanups (Denys Vlasnko)" * 'x86-fpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (23 commits) x86/fpu: Fixup uninitialized feature_name warning x86/fpu/math-emu: Add support for FISTTP instructions x86/fpu/math-emu, selftests: Add test for FISTTP instructions x86/fpu/math-emu: Add support for FCMOVcc insns x86/fpu/math-emu: Add support for F[U]COMI[P] insns x86/fpu/math-emu: Remove define layer for undocumented opcodes x86/fpu/math-emu, selftests: Add tests for FCMOV and FCOMI insns x86/fpu/math-emu: Remove !NO_UNDOC_CODE x86/fpu: Check CPU-provided sizes against struct declarations x86/fpu: Check to ensure increasing-offset xstate offsets x86/fpu: Correct and check XSAVE xstate size calculations x86/fpu: Add C structures for AVX-512 state components x86/fpu: Rework YMM definition x86/fpu/mpx: Rework MPX 'xstate' types x86/fpu: Add xfeature_enabled() helper instead of test_bit() x86/fpu: Remove 'xfeature_nr' x86/fpu: Rework XSTATE_* macros to remove magic '2' x86/fpu: Rename XFEATURES_NR_MAX x86/fpu: Rename XSAVE macros x86/fpu: Remove partial LWP support definitions ...
2015-11-03Merge branch 'x86-asm-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 asm changes from Ingo Molnar: "The main change in this cycle is another step in the big x86 system call interface rework by Andy Lutomirski, which moves most of the low level x86 entry code from assembly to C, for all syscall entries except native 64-bit system calls: arch/x86/entry/entry_32.S | 182 ++++------ arch/x86/entry/entry_64_compat.S | 547 ++++++++----------------------- 194 insertions(+), 535 deletions(-) ... our hope is that the final remaining step (converting native 64-bit system calls) will be less painful as all the previous steps, given that most of the legacies and quirks are concentrated around native 32-bit and compat environments" * 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (47 commits) x86/entry/32: Fix FS and GS restore in opportunistic SYSEXIT x86/entry/32: Fix entry_INT80_32() to expect interrupts to be on um/x86: Fix build after x86 syscall changes x86/asm: Remove the xyz_cfi macros from dwarf2.h selftests/x86: Style fixes for the 'unwind_vdso' test x86/entry/64/compat: Document sysenter_fix_flags's reason for existence x86/entry: Split and inline syscall_return_slowpath() x86/entry: Split and inline prepare_exit_to_usermode() x86/entry: Use pt_regs_to_thread_info() in syscall entry tracing x86/entry: Hide two syscall entry assertions behind CONFIG_DEBUG_ENTRY x86/entry: Micro-optimize compat fast syscall arg fetch x86/entry: Force inlining of 32-bit syscall code x86/entry: Make irqs_disabled checks in exit code depend on lockdep x86/entry: Remove unnecessary IRQ twiddling in fast 32-bit syscalls x86/asm: Remove thread_info.sysenter_return x86/entry/32: Re-implement SYSENTER using the new C path x86/entry/32: Switch INT80 to the new C syscall path x86/entry/32: Open-code return tracking from fork and kthreads x86/entry/compat: Implement opportunistic SYSRETL for compat syscalls x86/vdso/compat: Wire up SYSENTER and SYSCSALL for compat userspace ...
2015-10-31selftests/x86: Add a fork() to entry_from_vm86 to catch fork bugsAndy Lutomirski
Mere possession of vm86 state is strange. Make sure that nothing gets corrupted if we fork after calling vm86(). Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Brian Gerst <brgerst@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Stas Sergeev <stsp@list.ru> Link: http://lkml.kernel.org/r/08f83295460a80e41dc5e3e81ec40d6844d316f5.1446270067.git.luto@kernel.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2015-10-14selftests/x86: Style fixes for the 'unwind_vdso' testAndy Lutomirski
Checkpatch is really quite bad for user code like this, but it caught two legit style issues. Reported-by: Borislav Petkov <bp@suse.de> Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/3335040bdd40d2bca4b1a28a3f8b165361c801b7.1444696194.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-10-07selftests/x86: Add a test for ptrace syscall restart and arg modificationAndy Lutomirski
This tests assumptions about how fast syscall works wrt pt_regs and, in particular, what happens if IP is decremented by 2 during a syscall. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Link: http://lkml.kernel.org/r/1c44dbfe59000ba135bbf35ccc5d2433a0b31618.1444091584.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-10-07selftests/x86: Add a test for vDSO unwindingAndy Lutomirski
While the kernel itself doesn't use DWARF unwinding, user code expects to be able to unwind the vDSO. The vsyscall (AT_SYSINFO) entry is manually CFI-annotated, and this tests that it unwinds correctly. I tested the test by incorrectly annotating __kernel_vsyscall, and the test indeed fails if I do that. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Link: http://lkml.kernel.org/r/8bf736d1925cdd165c0f980156a4248e55af47a1.1444091584.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-09-20x86/fpu/math-emu, selftests: Add test for FISTTP instructionsDenys Vlasenko
$ ./test_FISTTP_32 [RUN] Testing fisttp instructions [OK] fisttp Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Link: http://lkml.kernel.org/r/1442757790-27233-1-git-send-email-dvlasenk@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-09-20x86/fpu/math-emu, selftests: Add tests for FCMOV and FCOMI insnsDenys Vlasenko
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1442494933-13798-1-git-send-email-dvlasenk@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-09-18x86/asm/entry/32, selftests: Add 'test_syscall_vdso' testDenys Vlasenko
This new test checks that all x86 registers are preserved across 32-bit syscalls. It tests syscalls through VDSO (if available) and through INT 0x80, normally and under ptrace. If kernel is a 64-bit one, high registers (r8..r15) are poisoned before the syscall is called and are checked afterwards. They must be either preserved, or cleared to zero (but r11 is special); r12..15 must be preserved for INT 0x80. EFLAGS is checked for changes too, but change there is not considered to be a bug (paravirt kernels do not preserve arithmetic flags). Run-tested on 64-bit kernel: $ ./test_syscall_vdso_32 [RUN] Executing 6-argument 32-bit syscall via VDSO [OK] Arguments are preserved across syscall [NOTE] R11 has changed:0000000000200ed7 - assuming clobbered by SYSRET insn [OK] R8..R15 did not leak kernel data [RUN] Executing 6-argument 32-bit syscall via INT 80 [OK] Arguments are preserved across syscall [OK] R8..R15 did not leak kernel data [RUN] Running tests under ptrace [RUN] Executing 6-argument 32-bit syscall via VDSO [OK] Arguments are preserved across syscall [OK] R8..R15 did not leak kernel data [RUN] Executing 6-argument 32-bit syscall via INT 80 [OK] Arguments are preserved across syscall [OK] R8..R15 did not leak kernel data On 32-bit paravirt kernel: $ ./test_syscall_vdso_32 [NOTE] Not a 64-bit kernel, won't test R8..R15 leaks [RUN] Executing 6-argument 32-bit syscall via VDSO [WARN] Flags before=0000000000200ed7 id 0 00 o d i s z 0 a 0 p 1 c [WARN] Flags after=0000000000200246 id 0 00 i z 0 0 p 1 [WARN] Flags change=0000000000000c91 0 00 o d s 0 a 0 0 c [OK] Arguments are preserved across syscall [RUN] Executing 6-argument 32-bit syscall via INT 80 [OK] Arguments are preserved across syscall [RUN] Running tests under ptrace [RUN] Executing 6-argument 32-bit syscall via VDSO [OK] Arguments are preserved across syscall [RUN] Executing 6-argument 32-bit syscall via INT 80 [OK] Arguments are preserved across syscall Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com> Acked-by: Andy Lutomirski <luto@amacapital.net> Cc: Alexei Starovoitov <ast@plumgrid.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Drewry <wad@chromium.org> Cc: linux-kernel@vger.kernel.org Link: http://lkml.kernel.org/r/1442427809-2027-1-git-send-email-dvlasenk@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-09-05x86/vm86: Block non-root vm86(old) if mmap_min_addr != 0Andy Lutomirski
vm86 exposes an interesting attack surface against the entry code. Since vm86 is mostly useless anyway if mmap_min_addr != 0, just turn it off in that case. There are some reports that vbetool can work despite setting mmap_min_addr to zero. This shouldn't break that use case, as CAP_SYS_RAWIO already overrides mmap_min_addr. Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Arjan van de Ven <arjan@linux.intel.com> Cc: Austin S Hemmelgarn <ahferroin7@gmail.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Josh Boyer <jwboyer@fedoraproject.org> Cc: Kees Cook <keescook@chromium.org> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stas Sergeev <stsp@list.ru> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-08-18selftests/x86: Add syscall_nt selftestAndy Lutomirski
I've had this sitting around for a while. Add it to the selftests tree. Far Cry running under Wine depends on this behavior. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/ee4d63799a9e5294b70930618b71d04d2770eb2d.1439838962.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-08-18selftests/x86: Disable sigreturn_64Andy Lutomirski
sigreturn_64 was broken by ed596cde9425 ("Revert x86 sigcontext cleanups"). Turn it off until we have a better fix. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/a184e75ff170a0bcd76bf376c41cad2c402fe9f7.1439838962.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-07-31selftests/x86/vm86: Fix entry_from_vm86 test on 64-bit kernelsAndy Lutomirski
The test failed due to an oversight on my part when run on a 64-bit kernel. vm86 isn't expected to work at all, and I mistakenly failed one part of the test because no signal was delivered. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/502c8bef877b33fe4943885ded6125dfcc7892db.1438205722.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-07-31selftests/x86, x86/ldt: Add a selftest for modify_ldt()Andy Lutomirski
This tests general modify_ldt() behavior (only writes, so far) as well as synchronous updates via IPI. It fails on old kernels. I called this ldt_gdt because I'll add set_thread_area() tests to it at some point. Signed-off-by: Andy Lutomirski <luto@kernel.org> Reviewed-by: Kees Cook <keescook@chromium.org> Cc: Andrew Cooper <andrew.cooper3@citrix.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Jan Beulich <jbeulich@suse.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sasha Levin <sasha.levin@oracle.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: security@kernel.org <security@kernel.org> Cc: xen-devel <xen-devel@lists.xen.org> Link: http://lkml.kernel.org/r/dcfda65dad07ff5a3ea97a9172b5963bf8031b2e.1438291540.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-07-21x86/selftests, x86/vm86: Improve entry_from_vm86 selftestAndy Lutomirski
The entry_from_vm86 selftest was very weak. Improve it: test more types of kernel entries from vm86 mode and test them more carefully. While we're at it, try to improve behavior on non-SEP CPUs. The old code was buggy because I misunderstood the intended semantics of #UD in vm86, so I didn't handle a possible signal. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Denys Vlasenko <vda.linux@googlemail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/d8ef1d7368ac70d8342481563ed50f9a7d2eea6f.1436492057.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-07-07x86/entry, selftests/x86: Add a test for 32-bit fast syscall arg faultsAndy Lutomirski
This test passes on 4.0 and fails on some newer kernels. Fortunately, the failure is likely not a big deal. This test will make sure that we don't break it further (e.g. OOPSing) as we clean up the entry code and that we eventually fix the regression. There's arguably no need to preserve the old ABI here -- anything that makes it into a fast (vDSO) syscall with a bad stack is about to crash no matter what we do. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Denys Vlasenko <vda.linux@googlemail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: paulmck@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/9cfcc51005168cb1b06b31991931214d770fc59a.1435952415.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-06-29Merge tag 'linux-kselftest-4.2-rc1' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest Pull kselftest update from Shuah Khan: "This update adds two new test suites: futex and seccomp. In addition, it includes fixes for bugs in timers, other tests, and compile framework. It introduces new quicktest feature to enable users to choose to run tests that complete in a short time" * tag 'linux-kselftest-4.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest: selftests: add quicktest support selftests: add seccomp suite selftest, x86: fix incorrect comment tools selftests: Fix 'clean' target with make 3.81 selftests/futex: Add .gitignore kselftest: Add exit code defines selftests: Add futex tests to the top-level Makefile selftests/futex: Increment ksft pass and fail counters selftests/futex: Update Makefile to use lib.mk selftests: Add futex functional tests kselftests: timers: Check _ALARM clockids are supported before suspending kselftests: timers: Ease alarmtimer-suspend unreasonable latency value kselftests: timers: Increase delay between suspends in alarmtimer-suspend selftests/exec: do not install subdir as it is already created selftests/ftrace: install test.d selftests: copy TEST_DIRS to INSTALL_PATH Test compaction of mlocked memory selftests/mount: output WARN messages when mount test skipped selftests/timers: Make git ignore all binaries in timers test suite
2015-06-22Merge branch 'x86-core-for-linus' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip Pull x86 core updates from Ingo Molnar: "There were so many changes in the x86/asm, x86/apic and x86/mm topics in this cycle that the topical separation of -tip broke down somewhat - so the result is a more traditional architecture pull request, collected into the 'x86/core' topic. The topics were still maintained separately as far as possible, so bisectability and conceptual separation should still be pretty good - but there were a handful of merge points to avoid excessive dependencies (and conflicts) that would have been poorly tested in the end. The next cycle will hopefully be much more quiet (or at least will have fewer dependencies). The main changes in this cycle were: * x86/apic changes, with related IRQ core changes: (Jiang Liu, Thomas Gleixner) - This is the second and most intrusive part of changes to the x86 interrupt handling - full conversion to hierarchical interrupt domains: [IOAPIC domain] ----- | [MSI domain] --------[Remapping domain] ----- [ Vector domain ] | (optional) | [HPET MSI domain] ----- | | [DMAR domain] ----------------------------- | [Legacy domain] ----------------------------- This now reflects the actual hardware and allowed us to distangle the domain specific code from the underlying parent domain, which can be optional in the case of interrupt remapping. It's a clear separation of functionality and removes quite some duct tape constructs which plugged the remap code between ioapic/msi/hpet and the vector management. - Intel IOMMU IRQ remapping enhancements, to allow direct interrupt injection into guests (Feng Wu) * x86/asm changes: - Tons of cleanups and small speedups, micro-optimizations. This is in preparation to move a good chunk of the low level entry code from assembly to C code (Denys Vlasenko, Andy Lutomirski, Brian Gerst) - Moved all system entry related code to a new home under arch/x86/entry/ (Ingo Molnar) - Removal of the fragile and ugly CFI dwarf debuginfo annotations. Conversion to C will reintroduce many of them - but meanwhile they are only getting in the way, and the upstream kernel does not rely on them (Ingo Molnar) - NOP handling refinements. (Borislav Petkov) * x86/mm changes: - Big PAT and MTRR rework: making the code more robust and preparing to phase out exposing direct MTRR interfaces to drivers - in favor of using PAT driven interfaces (Toshi Kani, Luis R Rodriguez, Borislav Petkov) - New ioremap_wt()/set_memory_wt() interfaces to support Write-Through cached memory mappings. This is especially important for good performance on NVDIMM hardware (Toshi Kani) * x86/ras changes: - Add support for deferred errors on AMD (Aravind Gopalakrishnan) This is an important RAS feature which adds hardware support for poisoned data. That means roughly that the hardware marks data which it has detected as corrupted but wasn't able to correct, as poisoned data and raises an APIC interrupt to signal that in the form of a deferred error. It is the OS's responsibility then to take proper recovery action and thus prolonge system lifetime as far as possible. - Add support for Intel "Local MCE"s: upcoming CPUs will support CPU-local MCE interrupts, as opposed to the traditional system- wide broadcasted MCE interrupts (Ashok Raj) - Misc cleanups (Borislav Petkov) * x86/platform changes: - Intel Atom SoC updates ... and lots of other cleanups, fixlets and other changes - see the shortlog and the Git log for details" * 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (222 commits) x86/hpet: Use proper hpet device number for MSI allocation x86/hpet: Check for irq==0 when allocating hpet MSI interrupts x86/mm/pat, drivers/infiniband/ipath: Use arch_phys_wc_add() and require PAT disabled x86/mm/pat, drivers/media/ivtv: Use arch_phys_wc_add() and require PAT disabled x86/platform/intel/baytrail: Add comments about why we disabled HPET on Baytrail genirq: Prevent crash in irq_move_irq() genirq: Enhance irq_data_to_desc() to support hierarchy irqdomain iommu, x86: Properly handle posted interrupts for IOMMU hotplug iommu, x86: Provide irq_remapping_cap() interface iommu, x86: Setup Posted-Interrupts capability for Intel iommu iommu, x86: Add cap_pi_support() to detect VT-d PI capability iommu, x86: Avoid migrating VT-d posted interrupts iommu, x86: Save the mode (posted or remapped) of an IRTE iommu, x86: Implement irq_set_vcpu_affinity for intel_ir_chip iommu: dmar: Provide helper to copy shared irte fields iommu: dmar: Extend struct irte for VT-d Posted-Interrupts iommu: Add new member capability to struct irq_remap_ops x86/asm/entry/64: Disentangle error_entry/exit gsbase/ebx/usermode code x86/asm/entry/32: Shorten __audit_syscall_entry() args preparation x86/asm/entry/32: Explain reloading of registers after __audit_syscall_entry() ...
2015-05-30x86/asm/entry/32, selftests: Add a selftest for kernel entries from VM86 modeAndy Lutomirski
Test a couple of special cases in 32-bit kernels for entries from vm86 mode. This will OOPS both old kernels due to a bug and and 4.1-rc5 due to a regression I introduced, and it should make sure that the SYSENTER-from-vm86-mode hack in the kernel keeps working. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Jan Beulich <JBeulich@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/09a9916761e0a9e42d4922f147af45a0079cc1e8.1432936374.git.luto@kernel.org Tests: 394838c96013 x86/asm/entry/32: Fix user_mode() misuses Tests: 7ba554b5ac69 x86/asm/entry/32: Really make user_mode() work correctly for VM86 mode Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-05-26selftest, x86: fix incorrect commentMartin Kelly
The current comment indicates it's checking for a 32-bit build environment, but it actually checks for a 64-bit environment. Fix this. Signed-off-by: Martin Kelly <martkell@amazon.com> Acked-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
2015-05-17Merge branch 'linus' into x86/asm, to resolve conflictsIngo Molnar
Conflicts: tools/testing/selftests/x86/Makefile tools/testing/selftests/x86/run_x86_tests.sh
2015-05-12selftests, x86: Rework x86 target architecture detectionAndy Lutomirski
We currently fail to build on a non-multilib x86_64 target. We print a helpful error, but it's nicer to allow the build to succeed. Fix it and improve cross-compilation support by detecting architecture support directly and building only the relevant tests. Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
2015-05-12selftests, x86: Remove useless run_tests ruleAndy Lutomirski
Now that selftests/x86 uses the kselftest infrastructure, the run_x86_tests.sh mechanism is just in the way. Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
2015-05-12selftests/x86: install testsTyler Baker
Include lib.mk and set TEST_PROGS where appropriate. Cc: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Tyler Baker <tyler.baker@linaro.org> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
2015-05-12selftest/x86: have no dependency on all when cross buildingTyler Baker
If the CROSS_COMPILE is set remove all's dependency on all_32 and all_64. Cc: Andy Lutomirski <luto@amacapital.net> Acked-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Tyler Baker <tyler.baker@linaro.org> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
2015-05-12selftest/x86: build both bitnessesTyler Baker
Using uname with the processor flag option in some cases can yield 'unknown' so lets use the machine flag option as it is deterministic. Add a dependency for all_32 when building on a x86 64 bit host so that both bitnesses are built in this case. Cc: Andy Lutomirski <luto@amacapital.net> Acked-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Tyler Baker <tyler.baker@linaro.org> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
2015-05-08x86, selftests: Add a test for the "sysret_ss_attrs" bugAndy Lutomirski
On AMD CPUs, SYSRET can return with a valid SS descriptor with with the hidden attributes set to an unusable state. Make sure the kernel doesn't let this happen. This detects an as-yet-unfixed regression. Note that the 64-bit version of this test fails on AMD CPUs on all kernel versions, although the issue in the 64-bit case is much less severe than in the 32-bit case. Reported-by: Brian Gerst <brgerst@gmail.com> Tested-by: Denys Vlasenko <dvlasenk@redhat.com> Signed-off-by: Andy Lutomirski <luto@kernel.org> Tests: e7d6eefaaa44 ("x86/vdso32/syscall.S: Do not load __USER32_DS to %ss") Cc: Alexei Starovoitov <ast@plumgrid.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Denys Vlasenko <vda.linux@googlemail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Drewry <wad@chromium.org> Link: http://lkml.kernel.org/r/resend_4d740841bac383742949e2fefb03982736595087.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-04-16x86, selftests: Add single_step_syscall testAndy Lutomirski
This is a very simple test that makes system calls with TF set. This test currently fails when running the 32-bit build on a 64-bit kernel on an Intel CPU. This bug will be fixed by the next commit. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Denys Vlasenko <vda.linux@googlemail.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Shuah Khan <shuah.kh@samsung.com> Link: http://lkml.kernel.org/r/20e68021155f6ab5c60590dcad81d37c68ea2c4f.1429139075.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
2015-04-08x86, selftests: Add sigreturn selftestAndy Lutomirski
This is my sigreturn test, added mostly unchanged from its old home. It exercises the sigreturn(2) syscall, specifically focusing on its interactions with various IRET corner cases. It tests for correct behavior in several areas that were historically dangerously buggy. For example, it exercises espfix on kernels of both bitnesses under various conditions, and it contains testcases for several now-fixed bugs in IRET error handling. If you run it on older kernels without the fixes, your system will crash. It probably won't eat your data in the process. There is no released kernel on which the sigreturn_64 test will pass, but it passes on tip:x86/asm. I plan to switch to lib.mk for Linux 4.2. I'm not using the ksft_ helpers at all yet. I can do that later. Signed-off-by: Andy Lutomirski <luto@kernel.org> Acked-by: Shuah Khan <shuahkh@osg.samsung.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Denys Vlasenko <vda.linux@googlemail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Shuah Khan <shuah.kh@samsung.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/89d10b76b92c7202d8123654dc8d36701c017b3d.1428386971.git.luto@kernel.org [ Fixed empty format string GCC build warning in trivial_32bit_program.c ] Signed-off-by: Ingo Molnar <mingo@kernel.org>