diff options
| author | Andy Lutomirski <[email protected]> | 2018-08-29 15:47:18 +0000 |
|---|---|---|
| committer | Thomas Gleixner <[email protected]> | 2018-08-31 15:08:22 +0000 |
| commit | 4012e77a903d114f915fc607d6d2ed54a3d6c9b1 (patch) | |
| tree | aa56d63db999604dd3004855996dca36c293e1cf /tools/lib/bpf/str_error.c | |
| parent | x86: Allow generating user-space headers without a compiler (diff) | |
| download | kernel-4012e77a903d114f915fc607d6d2ed54a3d6c9b1.tar.gz kernel-4012e77a903d114f915fc607d6d2ed54a3d6c9b1.zip | |
x86/nmi: Fix NMI uaccess race against CR3 switching
A NMI can hit in the middle of context switching or in the middle of
switch_mm_irqs_off(). In either case, CR3 might not match current->mm,
which could cause copy_from_user_nmi() and friends to read the wrong
memory.
Fix it by adding a new nmi_uaccess_okay() helper and checking it in
copy_from_user_nmi() and in __copy_from_user_nmi()'s callers.
Signed-off-by: Andy Lutomirski <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Rik van Riel <[email protected]>
Cc: Nadav Amit <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Jann Horn <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: [email protected]
Link: https://lkml.kernel.org/r/dd956eba16646fd0b15c3c0741269dfd84452dac.1535557289.git.luto@kernel.org
Diffstat (limited to 'tools/lib/bpf/str_error.c')
0 files changed, 0 insertions, 0 deletions