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udev: check that passed symbolic link path starts with /dev

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This commit is contained in:
Yu Watanabe
2021-06-02 19:25:53 +09:00
parent d46969072a
commit cd8bcff507
1 changed files with 7 additions and 2 deletions
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9
src/udev/udev-node.c
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@ -228,18 +228,23 @@ static size_t escape_path(const char *src, char *dest, size_t size) {
/* manage "stack of names" with possibly specified device priorities */
static int link_update(sd_device *dev, const char *slink, bool add) {
_cleanup_free_ char *filename = NULL, *dirname = NULL;
const char *slink_name, *id;
char name_enc[PATH_MAX];
const char *id;
int i, r, retries;
assert(dev);
assert(slink);
slink_name = path_startswith(slink, "/dev");
if (!slink_name)
return log_device_debug_errno(dev, SYNTHETIC_ERRNO(EINVAL),
"Invalid symbolic link of device node: %s", slink);
r = device_get_device_id(dev, &id);
if (r < 0)
return log_device_debug_errno(dev, r, "Failed to get device id: %m");
escape_path(slink + STRLEN("/dev"), name_enc, sizeof(name_enc));
escape_path(slink_name, name_enc, sizeof(name_enc));
dirname = path_join("/run/udev/links/", name_enc);
if (!dirname)
return log_oom();