[PATCH] keys: Fix proc_keys_next to increase position index

[David Howells]

From: Vasily Averin <vvs@xxxxxxxxxxxxx>

If seq_file .next function does not change position index,
read after some lseek can generate unexpected output:

$ dd if=/proc/keys bs=1  # full usual output
0f6bfdf5 I--Q---     2 perm 3f010000  1000  1000 user      4af2f79ab8848d0a: 740
1fb91b32 I--Q---     3 perm 1f3f0000  1000 65534 keyring   _uid.1000: 2
27589480 I--Q---     1 perm 0b0b0000     0     0 user      invocation_id: 16
2f33ab67 I--Q---   152 perm 3f030000     0     0 keyring   _ses: 2
33f1d8fa I--Q---     4 perm 3f030000  1000  1000 keyring   _ses: 1
3d427fda I--Q---     2 perm 3f010000  1000  1000 user      69ec44aec7678e5a: 740
3ead4096 I--Q---     1 perm 1f3f0000  1000 65534 keyring   _uid_ses.1000: 1
521+0 records in
521+0 records out
521 bytes copied, 0,00123769 s, 421 kB/s

$ dd if=/proc/keys bs=500 skip=1  # read after lseek in middle of last line
dd: /proc/keys: cannot skip to specified offset
g   _uid_ses.1000: 1        <<<< end of last line
3ead4096 I--Q---     1 perm 1f3f0000  1000 65534 keyring   _uid_ses.1000: 1
   <<<< and whole last line again
0+1 records in
0+1 records out
97 bytes copied, 0,000135035 s, 718 kB/s

$ dd if=/proc/keys bs=1000 skip=1   # read after lseek beyond end of file
dd: /proc/keys: cannot skip to specified offset
3ead4096 I--Q---     1 perm 1f3f0000  1000 65534 keyring   _uid_ses.1000: 1
   <<<< generates last line
0+1 records in
0+1 records out
76 bytes copied, 0,000119981 s, 633 kB/s

See https://bugzilla.kernel.org/show_bug.cgi?id=206283

Cc: stable@xxxxxxxxxxxxxxx
Fixes: 1f4aace60b0e ("fs/seq_file.c: simplify seq_file iteration code ...")
Signed-off-by: Vasily Averin <vvs@xxxxxxxxxxxxx>
Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
---

 security/keys/proc.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/security/keys/proc.c b/security/keys/proc.c
index 415f3f1c2da0..d0cde6685627 100644
--- a/security/keys/proc.c
+++ b/security/keys/proc.c
@@ -139,6 +139,8 @@ static void *proc_keys_next(struct seq_file *p, void *v, loff_t *_pos)
 	n = key_serial_next(p, v);
 	if (n)
 		*_pos = key_node_serial(n);
+	else
+		(*_pos)++;
 	return n;
 }