autofs/autofs-5.1.7-add-buffer-length-checks-to-autofs-mount_mount.patch

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2023-06-16 00:13:26 +00:00
autofs-5.1.7 - add buffer length checks to autofs mount_mount()
From: Ian Kent <raven@themaw.net>
---
CHANGELOG | 1
modules/mount_autofs.c | 59 +++++++++++++++++++++++++++++++++----------------
2 files changed, 41 insertions(+), 19 deletions(-)
--- autofs-5.1.7.orig/CHANGELOG
+++ autofs-5.1.7/CHANGELOG
@@ -138,6 +138,7 @@
- fix amd selector function matching.
- get rid entry thid field.
- continue expire immediately after submount check.
+- add buffer length checks to autofs mount_mount().
25/01/2021 autofs-5.1.7
- make bind mounts propagation slave by default.
--- autofs-5.1.7.orig/modules/mount_autofs.c
+++ autofs-5.1.7/modules/mount_autofs.c
@@ -50,8 +50,8 @@ int mount_mount(struct autofs_point *ap,
{
struct startup_cond suc;
pthread_t thid;
- char realpath[PATH_MAX];
- char mountpoint[PATH_MAX];
+ char realpath[PATH_MAX + 1];
+ char mountpoint[PATH_MAX + 1];
const char **argv;
int argc, status;
int nobind = ap->flags & MOUNT_FLAG_NOBIND;
@@ -68,32 +68,53 @@ int mount_mount(struct autofs_point *ap,
struct mnt_list *mnt;
char buf[MAX_ERR_BUF];
char *options, *p;
- int len, ret;
+ int err, ret;
int hosts = 0;
/* Root offset of multi-mount */
- len = strlen(root);
- if (root[len - 1] == '/') {
- strcpy(realpath, ap->path);
- strcat(realpath, "/");
- strcat(realpath, name);
- len--;
- strncpy(mountpoint, root, len);
- mountpoint[len] = '\0';
+ if (root[strlen(root) - 1] == '/') {
+ err = snprintf(realpath, PATH_MAX + 1, "%s/%s", ap->path, name);
+ if (err > PATH_MAX) {
+ error(ap->logopt, MODPREFIX "string too long for realpath");
+ return 1;
+ }
+ err = snprintf(mountpoint, PATH_MAX + 1, "%s", root);
+ if (err > PATH_MAX) {
+ error(ap->logopt, MODPREFIX "string too long for mountpoint");
+ return 1;
+ }
+ mountpoint[err - 1] = 0;
} else if (*name == '/') {
if (ap->flags & MOUNT_FLAG_REMOUNT) {
- strcpy(mountpoint, name);
- strcpy(realpath, name);
+ err = snprintf(mountpoint, PATH_MAX + 1, "%s", name);
+ if (err > PATH_MAX) {
+ error(ap->logopt, MODPREFIX "string too long for mountpoint");
+ return 1;
+ }
+ err = snprintf(realpath, PATH_MAX + 1, "%s", name);
+ if (err > PATH_MAX) {
+ error(ap->logopt, MODPREFIX "string too long for realpath");
+ return 1;
+ }
} else {
- strcpy(mountpoint, root);
- strcpy(realpath, name);
+ err = snprintf(mountpoint, PATH_MAX + 1, "%s", root);
+ if (err > PATH_MAX) {
+ error(ap->logopt, MODPREFIX "string too long for mountpoint");
+ return 1;
+ }
+ err = snprintf(realpath, PATH_MAX + 1, "%s", name);
+ if (err > PATH_MAX) {
+ error(ap->logopt, MODPREFIX "string too long for realpath");
+ return 1;
+ }
}
} else {
- strcpy(mountpoint, root);
- strcat(mountpoint, "/");
+ err = snprintf(mountpoint, PATH_MAX + 1, "%s/%s", root, name);
+ if (err > PATH_MAX) {
+ error(ap->logopt, MODPREFIX "string too long for mountpoint");
+ return 1;
+ }
strcpy(realpath, mountpoint);
- strcat(mountpoint, name);
- strcat(realpath, name);
}
options = NULL;