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authorAneesh Kumar K.V <aneesh.kumar@linux.ibm.com>2020-07-09 08:59:44 +0530
committerMichael Ellerman <mpe@ellerman.id.au>2020-07-22 00:00:56 +1000
commit0eaa3b5ca7b5a76e3783639c828498343be66a01 (patch)
tree5f114c7383bf82c3df50bfbb5f0d867391fdb42d /tools/testing/selftests/powerpc
parent9a11f12e0a6c374b3ef1ce81e32ce477d28eb1b8 (diff)
selftests/powerpc: ptrace-pkey: Update the test to mark an invalid pkey correctly
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20200709032946.881753-22-aneesh.kumar@linux.ibm.com
Diffstat (limited to 'tools/testing/selftests/powerpc')
-rw-r--r--tools/testing/selftests/powerpc/ptrace/ptrace-pkey.c30
1 files changed, 12 insertions, 18 deletions
diff --git a/tools/testing/selftests/powerpc/ptrace/ptrace-pkey.c b/tools/testing/selftests/powerpc/ptrace/ptrace-pkey.c
index a32a8034f956..80dc5085a412 100644
--- a/tools/testing/selftests/powerpc/ptrace/ptrace-pkey.c
+++ b/tools/testing/selftests/powerpc/ptrace/ptrace-pkey.c
@@ -66,11 +66,6 @@ static int sys_pkey_alloc(unsigned long flags, unsigned long init_access_rights)
return syscall(__NR_pkey_alloc, flags, init_access_rights);
}
-static int sys_pkey_free(int pkey)
-{
- return syscall(__NR_pkey_free, pkey);
-}
-
static int child(struct shared_info *info)
{
unsigned long reg;
@@ -100,7 +95,11 @@ static int child(struct shared_info *info)
info->amr1 |= 3ul << pkeyshift(pkey1);
info->amr2 |= 3ul << pkeyshift(pkey2);
- info->invalid_amr |= info->amr2 | 3ul << pkeyshift(pkey3);
+ /*
+ * invalid amr value where we try to force write
+ * things which are deined by a uamor setting.
+ */
+ info->invalid_amr = info->amr2 | (~0x0UL & ~info->expected_uamor);
if (disable_execute)
info->expected_iamr |= 1ul << pkeyshift(pkey1);
@@ -111,17 +110,12 @@ static int child(struct shared_info *info)
info->expected_uamor |= 3ul << pkeyshift(pkey1) |
3ul << pkeyshift(pkey2);
- info->invalid_iamr |= 1ul << pkeyshift(pkey1) | 1ul << pkeyshift(pkey2);
- info->invalid_uamor |= 3ul << pkeyshift(pkey1);
-
/*
- * We won't use pkey3. We just want a plausible but invalid key to test
- * whether ptrace will let us write to AMR bits we are not supposed to.
- *
- * This also tests whether the kernel restores the UAMOR permissions
- * after a key is freed.
+ * Create an IAMR value different from expected value.
+ * Kernel will reject an IAMR and UAMOR change.
*/
- sys_pkey_free(pkey3);
+ info->invalid_iamr = info->expected_iamr | (1ul << pkeyshift(pkey1) | 1ul << pkeyshift(pkey2));
+ info->invalid_uamor = info->expected_uamor & ~(0x3ul << pkeyshift(pkey1));
printf("%-30s AMR: %016lx pkey1: %d pkey2: %d pkey3: %d\n",
user_write, info->amr1, pkey1, pkey2, pkey3);
@@ -196,9 +190,9 @@ static int parent(struct shared_info *info, pid_t pid)
PARENT_SKIP_IF_UNSUPPORTED(ret, &info->child_sync);
PARENT_FAIL_IF(ret, &info->child_sync);
- info->amr1 = info->amr2 = info->invalid_amr = regs[0];
- info->expected_iamr = info->invalid_iamr = regs[1];
- info->expected_uamor = info->invalid_uamor = regs[2];
+ info->amr1 = info->amr2 = regs[0];
+ info->expected_iamr = regs[1];
+ info->expected_uamor = regs[2];
/* Wake up child so that it can set itself up. */
ret = prod_child(&info->child_sync);