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| author | Julien Thierry <[email protected]> | 2018-09-11 09:13:23 +0000 |
|---|---|---|
| committer | Russell King <[email protected]> | 2018-10-05 09:51:15 +0000 |
| commit | 621afc677465db231662ed126ae1f355bf8eac47 (patch) | |
| tree | d57298968c10f00cb662edb7214beec809c1350a /arch/arm/include/asm/assembler.h | |
| parent | ARM: 8793/1: signal: replace __put_user_error with __put_user (diff) | |
| download | kernel-621afc677465db231662ed126ae1f355bf8eac47.tar.gz kernel-621afc677465db231662ed126ae1f355bf8eac47.zip | |
ARM: 8794/1: uaccess: Prevent speculative use of the current addr_limit
A mispredicted conditional call to set_fs could result in the wrong
addr_limit being forwarded under speculation to a subsequent access_ok
check, potentially forming part of a spectre-v1 attack using uaccess
routines.
This patch prevents this forwarding from taking place, but putting heavy
barriers in set_fs after writing the addr_limit.
Porting commit c2f0ad4fc089cff8 ("arm64: uaccess: Prevent speculative use
of the current addr_limit").
Signed-off-by: Julien Thierry <[email protected]>
Signed-off-by: Russell King <[email protected]>
Diffstat (limited to 'arch/arm/include/asm/assembler.h')
0 files changed, 0 insertions, 0 deletions