From: Al Viro <viro@zeniv.linux.org.uk>
To: Hugh Dickins <hughd@google.com>
Cc: Laura Abbott <labbott@redhat.com>,
David Howells <dhowells@redhat.com>,
Linux-MM <linux-mm@kvack.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-fsdevel@vger.kernel.org
Subject: Re: mount on tmpfs failing to parse context option
Date: Tue, 8 Oct 2019 02:26:22 +0100 [thread overview]
Message-ID: <20191008012622.GP26530@ZenIV.linux.org.uk> (raw)
In-Reply-To: <alpine.LSU.2.11.1910071655060.4431@eggly.anvils>
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?
diff --git a/mm/shmem.c b/mm/shmem.c
index 0f7fd4a85db6..8dcc8d04cbaf 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 (;;) {
next prev parent reply other threads:[~2019-10-08 1:26 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-30 16:07 mount on tmpfs failing to parse context option Laura Abbott
2019-10-07 14:45 ` Laura Abbott
2019-10-08 0:50 ` Hugh Dickins
2019-10-08 1:26 ` Al Viro [this message]
2019-10-08 16:33 ` Laura Abbott
2019-10-08 12:38 ` Ian Kent
2019-10-08 12:52 ` Ian Kent
2019-10-08 12:56 ` Karel Zak
2019-10-08 19:51 ` Hugh Dickins
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