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authorLaura Abbott <labbott@redhat.com>2017-01-11 00:35:45 +0300
committerWill Deacon <will.deacon@arm.com>2017-01-11 16:56:50 +0300
commit46f6236aa1c48e06b10a2fe0386ac4114b438622 (patch)
treec935d6d0772a5b4e78bc9e7cf2ff4f6011b67fa2 /mm/usercopy.c
parent5c6a84a3f4558a6115fef1b59343c7ae56b3abc3 (diff)
downloadlinux-46f6236aa1c48e06b10a2fe0386ac4114b438622.tar.xz
mm/usercopy: Switch to using lm_alias
The usercopy checking code currently calls __va(__pa(...)) to check for aliases on symbols. Switch to using lm_alias instead. Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Laura Abbott <labbott@redhat.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'mm/usercopy.c')
-rw-r--r--mm/usercopy.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/usercopy.c b/mm/usercopy.c
index 3c8da0af9695..8345299e3e3b 100644
--- a/mm/usercopy.c
+++ b/mm/usercopy.c
@@ -108,13 +108,13 @@ static inline const char *check_kernel_text_object(const void *ptr,
* __pa() is not just the reverse of __va(). This can be detected
* and checked:
*/
- textlow_linear = (unsigned long)__va(__pa(textlow));
+ textlow_linear = (unsigned long)lm_alias(textlow);
/* No different mapping: we're done. */
if (textlow_linear == textlow)
return NULL;
/* Check the secondary mapping... */
- texthigh_linear = (unsigned long)__va(__pa(texthigh));
+ texthigh_linear = (unsigned long)lm_alias(texthigh);
if (overlaps(ptr, n, textlow_linear, texthigh_linear))
return "<linear kernel text>";