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| author | Peter Zijlstra <peterz@infradead.org> | 2019-08-29 11:24:45 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2019-09-02 15:22:38 +0300 |
| commit | 9b8bd476e78e89c9ea26c3b435ad0201c3d7dbf5 (patch) | |
| tree | b9a0554a17fe68adb8624c7845fdb1d8e0d7d324 /arch/x86/hyperv/mmu.c | |
| parent | 29d9a0b50736768f042752070e5cdf4e4d4c00df (diff) | |
| download | linux-9b8bd476e78e89c9ea26c3b435ad0201c3d7dbf5.tar.xz | |
x86/uaccess: Don't leak the AC flags into __get_user() argument evaluation
Identical to __put_user(); the __get_user() argument evalution will too
leak UBSAN crud into the __uaccess_begin() / __uaccess_end() region.
While uncommon this was observed to happen for:
drivers/xen/gntdev.c: if (__get_user(old_status, batch->status[i]))
where UBSAN added array bound checking.
This complements commit:
6ae865615fc4 ("x86/uaccess: Dont leak the AC flag into __put_user() argument evaluation")
Tested-by Sedat Dilek <sedat.dilek@gmail.com>
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: broonie@kernel.org
Cc: sfr@canb.auug.org.au
Cc: akpm@linux-foundation.org
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: mhocko@suse.cz
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lkml.kernel.org/r/20190829082445.GM2369@hirez.programming.kicks-ass.net
Diffstat (limited to 'arch/x86/hyperv/mmu.c')
0 files changed, 0 insertions, 0 deletions