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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e49d3cbef0
The error code in a page fault on a kernel address indicates whether that address is mapped, which should not be revealed in a signal. The normal code path for a page fault on a kernel address sanitizes the bit, but the paths for vsyscall emulation and SIGBUS do not. Both are harmless, but for subtle reasons. SIGBUS is never sent for a kernel address, and vsyscall emulation will never fault on a kernel address per se because it will fail an access_ok() check instead. Make the code more robust by adding a helper that sets the relevant fields and sanitizing the error code in the helper. This also cleans up the code -- we had three copies of roughly the same thing. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@surriel.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Yu-cheng Yu <yu-cheng.yu@intel.com> Link: http://lkml.kernel.org/r/b31159bd55bd0c4fa061a20dfd6c429c094bebaa.1542667307.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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