diff options
| author | Dan Williams <[email protected]> | 2018-01-30 01:02:59 +0000 |
|---|---|---|
| committer | Thomas Gleixner <[email protected]> | 2018-01-30 20:54:31 +0000 |
| commit | 2fbd7af5af8665d18bcefae3e9700be07e22b681 (patch) | |
| tree | e07c22dfe943ebbae6c3ca0a3d26aa3d31a2696d /lib/debugobjects.c | |
| parent | x86/get_user: Use pointer masking to limit speculation (diff) | |
| download | kernel-2fbd7af5af8665d18bcefae3e9700be07e22b681.tar.gz kernel-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 <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: Andy Lutomirski <[email protected]>
Cc: [email protected]
Link: https://lkml.kernel.org/r/151727417984.33451.1216731042505722161.stgit@dwillia2-desk3.amr.corp.intel.com
Diffstat (limited to 'lib/debugobjects.c')
0 files changed, 0 insertions, 0 deletions