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x86/headers: Make sigcontext pointers bit independent 

Before we can eliminate the duplication between 'struct
sigcontext_32' and 'struct sigcontext_ia32', make the 'fpstate'
pointer field in 'struct sigcontext_32' bit independent.

Acked-by: Mikko Rapeli <mikko.rapeli@iki.fi>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/1441438363-9999-12-git-send-email-mingo@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Ingo Molnar 2015-09-05 09:32:39 +02:00
parent f2c609bca0
commit 530e5c8271
2 changed files with 5 additions and 3 deletions
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4
arch/x86/include/uapi/asm/sigcontext.h
View File

@ -218,7 +218,7 @@ struct sigcontext_32 {
* of extended memory layout. See comments at the definition of
* (struct _fpx_sw_bytes)
*/
void __user *fpstate; /* Zero when no FPU/extended context */
__u32 fpstate; /* Zero when no FPU/extended context */
__u32 oldmask;
__u32 cr2;
};
@ -258,7 +258,7 @@ struct sigcontext_64 {
* of extended memory layout. See comments at the definition of
* (struct _fpx_sw_bytes)
*/
void __user *fpstate; /* Zero when no FPU/extended context */
__u64 fpstate; /* Zero when no FPU/extended context */
__u64 reserved1[8];
};

4
arch/x86/kernel/signal.c
View File

@ -63,6 +63,7 @@
int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
{
unsigned long buf_val;
void __user *buf;
unsigned int tmpflags;
unsigned int err = 0;
@ -107,7 +108,8 @@ int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc)
regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
regs->orig_ax = -1; /* disable syscall checks */
get_user_ex(buf, &sc->fpstate);
get_user_ex(buf_val, &sc->fpstate);
buf = (void __user *)buf_val;
} get_user_catch(err);
err |= fpu__restore_sig(buf, config_enabled(CONFIG_X86_32));