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3adb2d8723
Booting with vsyscall=xonly results in the following vsyscall VMA: ffffffffff600000-ffffffffff601000 --xp ... [vsyscall] Test does read from fixed vsyscall address to determine if kernel supports vsyscall page but it doesn't work because, well, vsyscall page is execute only. Fix test by trying to execute from the first byte of the page which contains gettimeofday() stub. This should work because vsyscall entry points have stable addresses by design. Alexey, avoiding parsing .config, /proc/config.gz and /proc/cmdline at all costs. Link: https://lkml.kernel.org/r/Ys2KgeiEMboU8Ytu@localhost.localdomain Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: Shuah Khan <skhan@linuxfoundation.org> Cc: <dylanbhatch@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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