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author | Tejun Heo <tj@kernel.org> | 2014-05-19 15:52:10 -0400 |
---|---|---|
committer | Pawel Osmialowski <p.osmialowsk@mcdsrvbld02.digital.local> | 2015-03-27 18:13:19 +0100 |
commit | 22ba078d6bbe928adfbfcfdead50c2294efa3933 (patch) | |
tree | f87a81ad507843e4eb8d7c48a00362b9eaf7442a | |
parent | 2fa66b1f180631e1908ea005328925d004b53c3c (diff) | |
download | linux-3.10-22ba078d6bbe928adfbfcfdead50c2294efa3933.tar.gz linux-3.10-22ba078d6bbe928adfbfcfdead50c2294efa3933.tar.bz2 linux-3.10-22ba078d6bbe928adfbfcfdead50c2294efa3933.zip |
sysfs: make sure read buffer is zeroedsandbox/pawelo/kernfs_better
13c589d5b0ac ("sysfs: use seq_file when reading regular files")
switched sysfs from custom read implementation to seq_file to enable
later transition to kernfs. After the change, the buffer passed to
->show() is acquired through seq_get_buf(); unfortunately, this
introduces a subtle behavior change. Before the commit, the buffer
passed to ->show() was always zero as it was allocated using
get_zeroed_page(). Because seq_file doesn't clear buffers on
allocation and neither does seq_get_buf(), after the commit, depending
on the behavior of ->show(), we may end up exposing uninitialized data
to userland thus possibly altering userland visible behavior and
leaking information.
Fix it by explicitly clearing the buffer.
Signed-off-by: Tejun Heo <tj@kernel.org>
Reported-by: Ron <ron@debian.org>
Fixes: 13c589d5b0ac ("sysfs: use seq_file when reading regular files")
Cc: stable <stable@vger.kernel.org> # 3.13+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | fs/sysfs/file.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c index a67d1c682fe..a7a188c3ed5 100644 --- a/fs/sysfs/file.c +++ b/fs/sysfs/file.c @@ -47,12 +47,13 @@ static int sysfs_kf_seq_show(struct seq_file *sf, void *v) ssize_t count; char *buf; - /* acquire buffer and ensure that it's >= PAGE_SIZE */ + /* acquire buffer and ensure that it's >= PAGE_SIZE and clear */ count = seq_get_buf(sf, &buf); if (count < PAGE_SIZE) { seq_commit(sf, -1); return 0; } + memset(buf, 0, PAGE_SIZE); /* * Invoke show(). Control may reach here via seq file lseek even |