diff options
| author | Sven Schnelle <svens@linux.ibm.com> | 2021-06-25 15:06:06 +0200 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2021-07-08 22:12:17 +0200 |
| commit | fbf50f47ea99d07aec59859027352d4837e84ce1 (patch) | |
| tree | 1d8aae4f639d404a5619c0739485002bde932f4c /arch/s390/mm | |
| parent | df29a7440c4b5c65765c8f60396b3b13063e24e9 (diff) | |
s390/signal: remove sigreturn on stack
{rt_}sigreturn is now called from the vdso, so we no longer
need the svc on the stack, and therefore no hack to support that
mechanism on machines with non-executable stack.
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/mm')
| -rw-r--r-- | arch/s390/mm/fault.c | 23 |
1 files changed, 0 insertions, 23 deletions
diff --git a/arch/s390/mm/fault.c b/arch/s390/mm/fault.c index 18b6212bd449..e33c43b38afe 100644 --- a/arch/s390/mm/fault.c +++ b/arch/s390/mm/fault.c @@ -285,26 +285,6 @@ static noinline void do_sigbus(struct pt_regs *regs) (void __user *)(regs->int_parm_long & __FAIL_ADDR_MASK)); } -static noinline int signal_return(struct pt_regs *regs) -{ - u16 instruction; - int rc; - - rc = __get_user(instruction, (u16 __user *) regs->psw.addr); - if (rc) - return rc; - if (instruction == 0x0a77) { - set_pt_regs_flag(regs, PIF_SYSCALL); - regs->int_code = 0x00040077; - return 0; - } else if (instruction == 0x0aad) { - set_pt_regs_flag(regs, PIF_SYSCALL); - regs->int_code = 0x000400ad; - return 0; - } - return -EACCES; -} - static noinline void do_fault_error(struct pt_regs *regs, int access, vm_fault_t fault) { @@ -312,9 +292,6 @@ static noinline void do_fault_error(struct pt_regs *regs, int access, switch (fault) { case VM_FAULT_BADACCESS: - if (access == VM_EXEC && signal_return(regs) == 0) - break; - fallthrough; case VM_FAULT_BADMAP: /* Bad memory access. Check if it is kernel or user space. */ if (user_mode(regs)) { |