Messages in this thread Patch in this message | | | Subject | [PATCH 3/4] x86: signal: unify the sigaltstack check with other arches | From | Stas Sergeev <> | Date | Sun, 31 Jan 2016 19:24:04 +0300 |
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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 <luto@amacapital.net> CC: linux-kernel@vger.kernel.org CC: Thomas Gleixner <tglx@linutronix.de> CC: Ingo Molnar <mingo@redhat.com> CC: "H. Peter Anvin" <hpa@zytor.com> CC: x86@kernel.org CC: Borislav Petkov <bp@suse.de> CC: Brian Gerst <brgerst@gmail.com> CC: Oleg Nesterov <oleg@redhat.com> CC: Richard Weinberger <richard@nod.at>
Signed-off-by: Stas Sergeev <stsp@users.sourceforge.net> --- 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
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