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authorLaura Abbott <labbott@redhat.com>2017-04-04 23:09:00 +0200
committerKees Cook <keescook@chromium.org>2017-04-05 21:30:18 +0200
commit517e1fbeb65f5eade8d14f46ac365db6c75aea9b (patch)
treee11991a0fd19229b26d945d72415938609238b99 /mm/usercopy.c
parentusercopy: Move enum for arch_within_stack_frames() (diff)
downloadlinux-517e1fbeb65f5eade8d14f46ac365db6c75aea9b.tar.xz
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mm/usercopy: Drop extra is_vmalloc_or_module() check
Previously virt_addr_valid() was insufficient to validate if virt_to_page() could be called on an address on arm64. This has since been fixed up so there is no need for the extra check. Drop it. Signed-off-by: Laura Abbott <labbott@redhat.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'mm/usercopy.c')
-rw-r--r--mm/usercopy.c11
1 files changed, 0 insertions, 11 deletions
diff --git a/mm/usercopy.c b/mm/usercopy.c
index 1eba99baf1cf..a9852b24715d 100644
--- a/mm/usercopy.c
+++ b/mm/usercopy.c
@@ -200,17 +200,6 @@ static inline const char *check_heap_object(const void *ptr, unsigned long n,
{
struct page *page;
- /*
- * Some architectures (arm64) return true for virt_addr_valid() on
- * vmalloced addresses. Work around this by checking for vmalloc
- * first.
- *
- * We also need to check for module addresses explicitly since we
- * may copy static data from modules to userspace
- */
- if (is_vmalloc_or_module_addr(ptr))
- return NULL;
-
if (!virt_addr_valid(ptr))
return NULL;