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authorSahitya Tummala <stummala@codeaurora.org>2019-01-03 16:48:15 +0530
committerChristoph Hellwig <hch@lst.de>2019-05-28 08:11:58 +0200
commitf6122ed2a4f9c9c1c073ddf6308d1b2ac10e0781 (patch)
treef0740d5387ddff7ad1251dcfb101864a729dce75 /fs/configfs/dir.c
parentcd6c84d8f0cdc911df435bb075ba22ce3c605b07 (diff)
configfs: Fix use-after-free when accessing sd->s_dentry
In the vfs_statx() context, during path lookup, the dentry gets added to sd->s_dentry via configfs_attach_attr(). In the end, vfs_statx() kills the dentry by calling path_put(), which invokes configfs_d_iput(). Ideally, this dentry must be removed from sd->s_dentry but it doesn't if the sd->s_count >= 3. As a result, sd->s_dentry is holding reference to a stale dentry pointer whose memory is already freed up. This results in use-after-free issue, when this stale sd->s_dentry is accessed later in configfs_readdir() path. This issue can be easily reproduced, by running the LTP test case - sh fs_racer_file_list.sh /config (https://github.com/linux-test-project/ltp/blob/master/testcases/kernel/fs/racer/fs_racer_file_list.sh) Fixes: 76ae281f6307 ('configfs: fix race between dentry put and lookup') Signed-off-by: Sahitya Tummala <stummala@codeaurora.org> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/configfs/dir.c')
-rw-r--r--fs/configfs/dir.c14
1 files changed, 6 insertions, 8 deletions
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index 5e7932d668ab..22203a3423a3 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -58,15 +58,13 @@ static void configfs_d_iput(struct dentry * dentry,
if (sd) {
/* Coordinate with configfs_readdir */
spin_lock(&configfs_dirent_lock);
- /* Coordinate with configfs_attach_attr where will increase
- * sd->s_count and update sd->s_dentry to new allocated one.
- * Only set sd->dentry to null when this dentry is the only
- * sd owner.
- * If not do so, configfs_d_iput may run just after
- * configfs_attach_attr and set sd->s_dentry to null
- * even it's still in use.
+ /*
+ * Set sd->s_dentry to null only when this dentry is the one
+ * that is going to be killed. Otherwise configfs_d_iput may
+ * run just after configfs_attach_attr and set sd->s_dentry to
+ * NULL even it's still in use.
*/
- if (atomic_read(&sd->s_count) <= 2)
+ if (sd->s_dentry == dentry)
sd->s_dentry = NULL;
spin_unlock(&configfs_dirent_lock);