diff options
| author | Chang S. Bae <chang.seok.bae@intel.com> | 2021-05-18 22:03:16 +0200 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2021-05-19 11:46:27 +0200 |
| commit | 939ef713297df2cc910592305aa26af0e87f28ac (patch) | |
| tree | 346b1c50d3928c071d45e4c899b4ffef58ef7b31 /arch/x86/include/asm | |
| parent | uapi/auxvec: Define the aux vector AT_MINSIGSTKSZ (diff) | |
| download | linux-939ef713297df2cc910592305aa26af0e87f28ac.tar.xz linux-939ef713297df2cc910592305aa26af0e87f28ac.zip | |
x86/signal: Introduce helpers to get the maximum signal frame size
Signal frames do not have a fixed format and can vary in size when a number
of things change: supported XSAVE features, 32 vs. 64-bit apps, etc.
Add support for a runtime method for userspace to dynamically discover
how large a signal stack needs to be.
Introduce a new variable, max_frame_size, and helper functions for the
calculation to be used in a new user interface. Set max_frame_size to a
system-wide worst-case value, instead of storing multiple app-specific
values.
Signed-off-by: Chang S. Bae <chang.seok.bae@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Len Brown <len.brown@intel.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: H.J. Lu <hjl.tools@gmail.com>
Link: https://lkml.kernel.org/r/20210518200320.17239-3-chang.seok.bae@intel.com
Diffstat (limited to 'arch/x86/include/asm')
| -rw-r--r-- | arch/x86/include/asm/fpu/signal.h | 2 | ||||
| -rw-r--r-- | arch/x86/include/asm/sigframe.h | 2 |
2 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/include/asm/fpu/signal.h b/arch/x86/include/asm/fpu/signal.h index 7fb516b6893a..8b6631dffefd 100644 --- a/arch/x86/include/asm/fpu/signal.h +++ b/arch/x86/include/asm/fpu/signal.h @@ -29,6 +29,8 @@ unsigned long fpu__alloc_mathframe(unsigned long sp, int ia32_frame, unsigned long *buf_fx, unsigned long *size); +unsigned long fpu__get_fpstate_size(void); + extern void fpu__init_prepare_fx_sw_frame(void); #endif /* _ASM_X86_FPU_SIGNAL_H */ diff --git a/arch/x86/include/asm/sigframe.h b/arch/x86/include/asm/sigframe.h index 84eab2724875..5b1ed650b124 100644 --- a/arch/x86/include/asm/sigframe.h +++ b/arch/x86/include/asm/sigframe.h @@ -85,4 +85,6 @@ struct rt_sigframe_x32 { #endif /* CONFIG_X86_64 */ +void __init init_sigframe_size(void); + #endif /* _ASM_X86_SIGFRAME_H */ |