diff options
Diffstat (limited to 'arch/x86/kernel/sigframe.h')
| -rw-r--r-- | arch/x86/kernel/sigframe.h | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/arch/x86/kernel/sigframe.h b/arch/x86/kernel/sigframe.h index 8b4956e800a..cc673aa55ce 100644 --- a/arch/x86/kernel/sigframe.h +++ b/arch/x86/kernel/sigframe.h @@ -3,9 +3,18 @@ struct sigframe { char __user *pretcode; int sig; struct sigcontext sc; - struct _fpstate fpstate; + /* + * fpstate is unused. fpstate is moved/allocated after + * retcode[] below. This movement allows to have the FP state and the + * future state extensions (xsave) stay together. + * And at the same time retaining the unused fpstate, prevents changing + * the offset of extramask[] in the sigframe and thus prevent any + * legacy application accessing/modifying it. + */ + struct _fpstate fpstate_unused; unsigned long extramask[_NSIG_WORDS-1]; char retcode[8]; + /* fp state follows here */ }; struct rt_sigframe { @@ -15,14 +24,15 @@ struct rt_sigframe { void __user *puc; struct siginfo info; struct ucontext uc; - struct _fpstate fpstate; char retcode[8]; + /* fp state follows here */ }; #else struct rt_sigframe { char __user *pretcode; struct ucontext uc; struct siginfo info; + /* fp state follows here */ }; int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info, |