x86/vsyscall: Show something useful on a read fault

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Just segfaulting the application when it tries to read the vsyscall page in
xonly mode is not helpful for those who need to debug it.

Emit a hint.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Florian Weimer <fweimer@redhat.com>
Cc: Jann Horn <jannh@google.com>
Link: https://lkml.kernel.org/r/8016afffe0eab497be32017ad7f6f7030dc3ba66.1561610354.git.luto@kernel.org

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Andy Lutomirski 2019-06-26 21:45:04 -07:00 • committed by Thomas Gleixner

parent bd49e16e33

commit 918ce32509

3 changed files with 27 additions and 9 deletions

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19

arch/x86/entry/vsyscall/vsyscall_64.c

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6

arch/x86/include/asm/vsyscall.h

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11

arch/x86/mm/fault.c

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