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| author | Dan Williams <dan.j.williams@intel.com> | 2018-01-29 17:02:59 -0800 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2018-01-30 21:54:31 +0100 |
| commit | 2fbd7af5af8665d18bcefae3e9700be07e22b681 (patch) | |
| tree | e07c22dfe943ebbae6c3ca0a3d26aa3d31a2696d /include | |
| parent | c7f631cb07e7da06ac1d231ca178452339e32a94 (diff) | |
| download | linux-stable-2fbd7af5af8665d18bcefae3e9700be07e22b681.tar.gz linux-stable-2fbd7af5af8665d18bcefae3e9700be07e22b681.tar.bz2 linux-stable-2fbd7af5af8665d18bcefae3e9700be07e22b681.zip | |
x86/syscall: Sanitize syscall table de-references under speculation
The syscall table base is a user controlled function pointer in kernel
space. Use array_index_nospec() to prevent any out of bounds speculation.
While retpoline prevents speculating into a userspace directed target it
does not stop the pointer de-reference, the concern is leaking memory
relative to the syscall table base, by observing instruction cache
behavior.
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arch@vger.kernel.org
Cc: kernel-hardening@lists.openwall.com
Cc: gregkh@linuxfoundation.org
Cc: Andy Lutomirski <luto@kernel.org>
Cc: alan@linux.intel.com
Link: https://lkml.kernel.org/r/151727417984.33451.1216731042505722161.stgit@dwillia2-desk3.amr.corp.intel.com
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions