diff options
author | Sasha Levin <levinsasha928@gmail.com> | 2012-07-16 18:01:26 -0400 |
---|---|---|
committer | J. Bruce Fields <bfields@redhat.com> | 2012-10-17 14:59:10 -0400 |
commit | 212ba90696ab4884e2025b0b13726d67aadc2cd4 (patch) | |
tree | 276684ec966fb9888b0f351f347bc8ecd6bba1f9 /net/sunrpc/cache.c | |
parent | cd0b16c1c3cda12dbed1f8de8f1a9b0591990724 (diff) |
SUNRPC: Prevent kernel stack corruption on long values of flush
The buffer size in read_flush() is too small for the longest possible values
for it. This can lead to a kernel stack corruption:
[ 43.047329] Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: ffffffff833e64b4
[ 43.047329]
[ 43.049030] Pid: 6015, comm: trinity-child18 Tainted: G W 3.5.0-rc7-next-20120716-sasha #221
[ 43.050038] Call Trace:
[ 43.050435] [<ffffffff836c60c2>] panic+0xcd/0x1f4
[ 43.050931] [<ffffffff833e64b4>] ? read_flush.isra.7+0xe4/0x100
[ 43.051602] [<ffffffff810e94e6>] __stack_chk_fail+0x16/0x20
[ 43.052206] [<ffffffff833e64b4>] read_flush.isra.7+0xe4/0x100
[ 43.052951] [<ffffffff833e6500>] ? read_flush_pipefs+0x30/0x30
[ 43.053594] [<ffffffff833e652c>] read_flush_procfs+0x2c/0x30
[ 43.053596] [<ffffffff812b9a8c>] proc_reg_read+0x9c/0xd0
[ 43.053596] [<ffffffff812b99f0>] ? proc_reg_write+0xd0/0xd0
[ 43.053596] [<ffffffff81250d5b>] do_loop_readv_writev+0x4b/0x90
[ 43.053596] [<ffffffff81250fd6>] do_readv_writev+0xf6/0x1d0
[ 43.053596] [<ffffffff812510ee>] vfs_readv+0x3e/0x60
[ 43.053596] [<ffffffff812511b8>] sys_readv+0x48/0xb0
[ 43.053596] [<ffffffff8378167d>] system_call_fastpath+0x1a/0x1f
Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Cc: stable@kernel.org
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Diffstat (limited to 'net/sunrpc/cache.c')
-rw-r--r-- | net/sunrpc/cache.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c index 2a68bb3db772..fc2f7aa4dca7 100644 --- a/net/sunrpc/cache.c +++ b/net/sunrpc/cache.c | |||
@@ -1409,11 +1409,11 @@ static ssize_t read_flush(struct file *file, char __user *buf, | |||
1409 | size_t count, loff_t *ppos, | 1409 | size_t count, loff_t *ppos, |
1410 | struct cache_detail *cd) | 1410 | struct cache_detail *cd) |
1411 | { | 1411 | { |
1412 | char tbuf[20]; | 1412 | char tbuf[22]; |
1413 | unsigned long p = *ppos; | 1413 | unsigned long p = *ppos; |
1414 | size_t len; | 1414 | size_t len; |
1415 | 1415 | ||
1416 | sprintf(tbuf, "%lu\n", convert_to_wallclock(cd->flush_time)); | 1416 | snprintf(tbuf, sizeof(tbuf), "%lu\n", convert_to_wallclock(cd->flush_time)); |
1417 | len = strlen(tbuf); | 1417 | len = strlen(tbuf); |
1418 | if (p >= len) | 1418 | if (p >= len) |
1419 | return 0; | 1419 | return 0; |