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The 'pax' argument is unnecesary. Instead, store the RAX value directly in regs. This pattern goes all the way back to 2.1.106pre1, when restore_sigcontext() was changed to return an error code instead of EAX directly: https://git.kernel.org/cgit/linux/kernel/git/history/history.git/diff/arch/i386/kernel/signal.c?id=9a8f8b7ca3f319bd668298d447bdf32730e51174 In 2007 sigaltstack syscall support was added, where the return value of restore_sigcontext() was changed to carry the memory-copying failure code. But instead of putting 'ax' into regs->ax directly, it was carried in via a pointer and then returned, where the generic syscall return code copied it to regs->ax. So there was never any deeper reason for this suboptimal pattern, it was simply never noticed after being introduced. Signed-off-by: Brian Gerst <brgerst@gmail.com> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1428152303-17154-1-git-send-email-brgerst@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
21 lines
686 B
C
21 lines
686 B
C
#ifndef _ASM_X86_SIGHANDLING_H
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#define _ASM_X86_SIGHANDLING_H
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#include <linux/compiler.h>
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#include <linux/ptrace.h>
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#include <linux/signal.h>
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#include <asm/processor-flags.h>
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#define FIX_EFLAGS (X86_EFLAGS_AC | X86_EFLAGS_OF | \
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X86_EFLAGS_DF | X86_EFLAGS_TF | X86_EFLAGS_SF | \
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X86_EFLAGS_ZF | X86_EFLAGS_AF | X86_EFLAGS_PF | \
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X86_EFLAGS_CF | X86_EFLAGS_RF)
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void signal_fault(struct pt_regs *regs, void __user *frame, char *where);
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int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc);
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int setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate,
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struct pt_regs *regs, unsigned long mask);
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#endif /* _ASM_X86_SIGHANDLING_H */
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