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| author | Michal Hocko <mhocko@suse.com> | 2017-05-09 00:57:24 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-05-09 02:15:12 +0200 |
| commit | 81be3dee96346fbe08c31be5ef74f03f6b63cf68 (patch) | |
| tree | 0da1345c2f9b956b944c442e1df062dce6d692f9 /lib/iov_iter.c | |
| parent | net/ipv6/ila/ila_xlat.c: simplify a strange allocation pattern (diff) | |
| download | linux-81be3dee96346fbe08c31be5ef74f03f6b63cf68.tar.xz linux-81be3dee96346fbe08c31be5ef74f03f6b63cf68.zip | |
fs/xattr.c: zero out memory copied to userspace in getxattr
getxattr uses vmalloc to allocate memory if kzalloc fails. This is
filled by vfs_getxattr and then copied to the userspace. vmalloc,
however, doesn't zero out the memory so if the specific implementation
of the xattr handler is sloppy we can theoretically expose a kernel
memory. There is no real sign this is really the case but let's make
sure this will not happen and use vzalloc instead.
Fixes: 779302e67835 ("fs/xattr.c:getxattr(): improve handling of allocation failures")
Link: http://lkml.kernel.org/r/20170306103327.2766-1-mhocko@kernel.org
Acked-by: Kees Cook <keescook@chromium.org>
Reported-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Michal Hocko <mhocko@suse.com>
Cc: <stable@vger.kernel.org> [3.6+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/iov_iter.c')
0 files changed, 0 insertions, 0 deletions