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f72a249b0b
copy_user_to_xstate() uses __copy_from_user(), which provides a negligible speedup. Fortunately, both call sites are at least almost correct. __fpu__restore_sig() checks access_ok() with xstate_sigframe_size() length and ptrace regset access uses fpu_user_xstate_size. These should be valid upper bounds on the length, so, at worst, this would cause spurious failures and not accesses to kernel memory. Nonetheless, this is far more fragile than necessary and none of these callers are in a hotpath. Use copy_from_user() instead. Signed-off-by: Andy Lutomirski <luto@kernel.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Acked-by: Dave Hansen <dave.hansen@linux.intel.com> Acked-by: Rik van Riel <riel@surriel.com> Link: https://lkml.kernel.org/r/20210608144346.140254130@linutronix.de |
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| entry | ||
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| hyperv | ||
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| include | ||
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| lib | ||
| math-emu | ||
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| .gitignore | ||
| Kbuild | ||
| Kconfig | ||
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| Kconfig.cpu | ||
| Kconfig.debug | ||
| Makefile | ||
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| Makefile_32.cpu | ||