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| author | Amir Goldstein <amir73il@gmail.com> | 2023-10-12 15:08:28 +0200 |
|---|---|---|
| committer | Amir Goldstein <amir73il@gmail.com> | 2023-10-12 17:53:37 +0200 |
| commit | c34706acf40b43dd31f67c92c5a95d39666a1eb3 (patch) | |
| tree | 0cd2f1457a0531e6656ef557cb5ee601a04da1e6 /fs | |
| parent | fs: factor out vfs_parse_monolithic_sep() helper (diff) | |
| download | linux-c34706acf40b43dd31f67c92c5a95d39666a1eb3.tar.xz linux-c34706acf40b43dd31f67c92c5a95d39666a1eb3.zip | |
ovl: fix regression in parsing of mount options with escaped comma
Ever since commit 91c77947133f ("ovl: allow filenames with comma"), the
following example was legit overlayfs mount options:
mount -t overlay overlay -o 'lowerdir=/tmp/a\,b/lower' /mnt
The conversion to new mount api moved to using the common helper
generic_parse_monolithic() and discarded the specialized ovl_next_opt()
option separator.
Bring back ovl_next_opt() and use vfs_parse_monolithic_sep() to fix the
regression.
Reported-by: Ryan Hendrickson <ryan.hendrickson@alum.mit.edu>
Closes: https://lore.kernel.org/r/8da307fb-9318-cf78-8a27-ba5c5a0aef6d@alum.mit.edu/
Fixes: 1784fbc2ed9c ("ovl: port to new mount api")
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/overlayfs/params.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/fs/overlayfs/params.c b/fs/overlayfs/params.c index 95b751507ac8..17c74ef4f089 100644 --- a/fs/overlayfs/params.c +++ b/fs/overlayfs/params.c @@ -157,6 +157,34 @@ const struct fs_parameter_spec ovl_parameter_spec[] = { {} }; +static char *ovl_next_opt(char **s) +{ + char *sbegin = *s; + char *p; + + if (sbegin == NULL) + return NULL; + + for (p = sbegin; *p; p++) { + if (*p == '\\') { + p++; + if (!*p) + break; + } else if (*p == ',') { + *p = '\0'; + *s = p + 1; + return sbegin; + } + } + *s = NULL; + return sbegin; +} + +static int ovl_parse_monolithic(struct fs_context *fc, void *data) +{ + return vfs_parse_monolithic_sep(fc, data, ovl_next_opt); +} + static ssize_t ovl_parse_param_split_lowerdirs(char *str) { ssize_t nr_layers = 1, nr_colons = 0; @@ -682,6 +710,7 @@ static int ovl_reconfigure(struct fs_context *fc) } static const struct fs_context_operations ovl_context_ops = { + .parse_monolithic = ovl_parse_monolithic, .parse_param = ovl_parse_param, .get_tree = ovl_get_tree, .reconfigure = ovl_reconfigure, |