The patch titled
fs/select.c: fix information leak to userspace
has been removed from the -mm tree. Its filename was
fs-select-fix-information-leak-to-userspace.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: fs/select.c: fix information leak to userspace
From: Vasiliy Kulikov <segooon@xxxxxxxxx>
On some architectures __kernel_suseconds_t is int. On these archs struct
timeval has padding bytes at the end. This struct is copied to userspace
with these padding bytes uninitialized. This leads to leaking of contents
of kernel stack memory.
This bug was added with v2.6.27-rc5-286-gb773ad4.
[akpm@xxxxxxxxxxxxxxxxxxxx: avoid the memset on architectures which don't need it]
Signed-off-by: Vasiliy Kulikov <segooon@xxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/select.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN fs/select.c~fs-select-fix-information-leak-to-userspace fs/select.c
--- a/fs/select.c~fs-select-fix-information-leak-to-userspace
+++ a/fs/select.c
@@ -306,6 +306,8 @@ static int poll_select_copy_remaining(st
rts.tv_sec = rts.tv_nsec = 0;
if (timeval) {
+ if (sizeof(rtv) > sizeof(rtv.tv_sec) + sizeof(rtv.tv_usec))
+ memset(&rtv, 0, sizeof(rtv));
rtv.tv_sec = rts.tv_sec;
rtv.tv_usec = rts.tv_nsec / NSEC_PER_USEC;
_
Patches currently in -mm which might be from segooon@xxxxxxxxx are
origin.patch
linux-next.patch
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