diff options
| -rw-r--r-- | arch/i386/kernel/signal.c | 6 | ||||
| -rw-r--r-- | arch/x86_64/ia32/ia32_signal.c | 6 |
2 files changed, 10 insertions, 2 deletions
diff --git a/arch/i386/kernel/signal.c b/arch/i386/kernel/signal.c index 61eb0c8a6e4..adcd069db91 100644 --- a/arch/i386/kernel/signal.c +++ b/arch/i386/kernel/signal.c @@ -338,7 +338,11 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) esp = (unsigned long) ka->sa.sa_restorer; } - return (void __user *)((esp - frame_size) & -8ul); + esp -= frame_size; + /* Align the stack pointer according to the i386 ABI, + * i.e. so that on function entry ((sp + 4) & 15) == 0. */ + esp = ((esp + 4) & -16ul) - 4; + return (void __user *) esp; } /* These symbols are defined with the addresses in the vsyscall page. diff --git a/arch/x86_64/ia32/ia32_signal.c b/arch/x86_64/ia32/ia32_signal.c index 66e2821533d..0903cc1faef 100644 --- a/arch/x86_64/ia32/ia32_signal.c +++ b/arch/x86_64/ia32/ia32_signal.c @@ -425,7 +425,11 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size) rsp = (unsigned long) ka->sa.sa_restorer; } - return (void __user *)((rsp - frame_size) & -8UL); + rsp -= frame_size; + /* Align the stack pointer according to the i386 ABI, + * i.e. so that on function entry ((sp + 4) & 15) == 0. */ + rsp = ((rsp + 4) & -16ul) - 4; + return (void __user *) rsp; } int ia32_setup_frame(int sig, struct k_sigaction *ka, |