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ext4: avoid potential buffer over-read in parse_apply_sb_mount_options()

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[ Upstream commit 8ecb790ea8c3fc69e77bace57f14cf0d7c177bd8 ]

Unlike other strings in the ext4 superblock, we rely on tune2fs to
make sure s_mount_opts is NUL terminated.  Harden
parse_apply_sb_mount_options() by treating s_mount_opts as a potential
__nonstring.

Cc: stable@vger.kernel.org
Fixes: 8b67f04ab9 ("ext4: Add mount options in superblock")
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Message-ID: <20250916-tune2fs-v2-1-d594dc7486f0@mit.edu>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
[ applied to ext4_fill_super() instead of parse_apply_sb_mount_options() ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Theodore Ts'o 2025-10-21 13:49:05 -04:00 • committed by Greg Kroah-Hartman
commit 7bf46ff83a
1 changed files with 4 additions and 6 deletions
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10
fs/ext4/super.c
View file

@ -3882,18 +3882,16 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
}
if (sbi->s_es->s_mount_opts[0]) {
char *s_mount_opts = kstrndup(sbi->s_es->s_mount_opts,
sizeof(sbi->s_es->s_mount_opts),
GFP_KERNEL);
if (!s_mount_opts)
goto failed_mount;
char s_mount_opts[65];
strscpy_pad(s_mount_opts, sbi->s_es->s_mount_opts,
sizeof(s_mount_opts));
if (!parse_options(s_mount_opts, sb, &journal_devnum,
&journal_ioprio, 0)) {
ext4_msg(sb, KERN_WARNING,
"failed to parse options in superblock: %s",
s_mount_opts);
}
kfree(s_mount_opts);
}
sbi->s_def_mount_opt = sbi->s_mount_opt;
if (!parse_options((char *) data, sb, &journal_devnum,