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From db379c4b35d376201113a798aacb7e01a6f63375 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Tue, 8 Oct 2019 02:26:22 +0100
Subject: [PATCH] mount on tmpfs failing to parse context option
On Mon, Oct 07, 2019 at 05:50:31PM -0700, Hugh Dickins wrote:
[sorry for being MIA - had been sick through the last week, just digging
myself from under piles of mail; my apologies]
> (tmpfs, very tiresomely, supports a NUMA "mpol" mount option which can
> have commas in it e.g "mpol=bind:0,2": which makes all its comma parsing
> awkward. I assume that where the new mount API commits bend over to
> accommodate that peculiarity, they end up mishandling the comma in
> the context string above.)
Dumber than that, I'm afraid. mpol is the reason for having
->parse_monolithic() in the first place, all right, but the problem is
simply the lack of security_sb_eat_lsm_opts() call in it.
Could you check if the following fixes that one?
---
mm/shmem.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/mm/shmem.c b/mm/shmem.c
index cd570cc79c76..220be9fa2c41 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -3482,6 +3482,12 @@ static int shmem_parse_options(struct fs_context *fc, void *data)
{
char *options = data;
+ if (options) {
+ int err = security_sb_eat_lsm_opts(options, &fc->security);
+ if (err)
+ return err;
+ }
+
while (options != NULL) {
char *this_char = options;
for (;;) {
--
2.21.0
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