Currently x86's get_sigframe() checks for "current->sas_ss_size"
to determine whether there is a need to switch to sigaltstack.
The common practice used by all other arches is to check for
sas_ss_flags(sp) == 0
This patch makes the code consistent with other arches and also
allows for the further sigaltstack improvements within this patch serie.
CC: Andy Lutomirski <[email protected]>
CC: [email protected]
CC: Thomas Gleixner <[email protected]>
CC: Ingo Molnar <[email protected]>
CC: "H. Peter Anvin" <[email protected]>
CC: [email protected]
CC: Borislav Petkov <[email protected]>
CC: Brian Gerst <[email protected]>
CC: Oleg Nesterov <[email protected]>
CC: Richard Weinberger <[email protected]>
Signed-off-by: Stas Sergeev <[email protected]>
---
arch/x86/kernel/signal.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index cb6282c..3955259 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -216,7 +216,7 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs
*regs, size_t frame_size,
if (!onsigstack) {
/* This is the X/Open sanctioned signal stack switching. */
if (ka->sa.sa_flags & SA_ONSTACK) {
- if (current->sas_ss_size)
+ if (sas_ss_flags(sp) == 0)
sp = current->sas_ss_sp + current->sas_ss_size;
} else if (config_enabled(CONFIG_X86_32) &&
(regs->ss & 0xffff) != __USER_DS &&
--
2.5.0
