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Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/fs/namei.c b/fs/namei.c
index d11f404667e9..b83d38f614ff 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1678,6 +1678,15 @@ struct file *do_filp_open(int dfd, const char *pathname,
int will_write;
int flag = open_to_namei_flags(open_flag);
+ /*
+ * O_SYNC is implemented as __O_SYNC|O_DSYNC. As many places only
+ * check for O_DSYNC if the need any syncing at all we enforce it's
+ * always set instead of having to deal with possibly weird behaviour
+ * for malicious applications setting only __O_SYNC.
+ */
+ if (open_flag & __O_SYNC)
+ open_flag |= O_DSYNC;
+
if (!acc_mode)
acc_mode = MAY_OPEN | ACC_MODE(flag);