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BufferOverflow Hardening #1896

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BufferOverflow Hardening #1896

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895d43a
BufferOverflow Hardening
Abdullah-Ebryx Oct 15, 2025
4af9422
Styling Commit
Abdullah-Ebryx Oct 15, 2025
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4 changes: 2 additions & 2 deletions src/libcrun/chroot_realpath.c
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Original file line number Diff line number Diff line change
Expand Up @@ -47,7 +47,7 @@

#define MAX_READLINKS 32

char *chroot_realpath(const char *chroot, const char *path, char resolved_path[])
char *chroot_realpath(const char *chroot, const char *path, char resolved_path[],size_t size_resolved_path)
{
char copy_path[PATH_MAX];
char link_path[PATH_MAX];
Expand Down Expand Up @@ -135,7 +135,7 @@ char *chroot_realpath(const char *chroot, const char *path, char resolved_path[]
if (n < 0) {
/* If a component doesn't exist, then return what we could translate. */
if (errno == ENOENT) {
int ret = snprintf (resolved_path, PATH_MAX, "%s%s%s", got_path, path[0] == '/' || path[0] == '\0' ? "" : "/", path);
int ret = snprintf (resolved_path, size_resolved_path, "%s%s%s", got_path, path[0] == '/' || path[0] == '\0' ? "" : "/", path);
if (ret >= PATH_MAX) {
__set_errno(ENAMETOOLONG);
return NULL;
Expand Down
6 changes: 3 additions & 3 deletions src/libcrun/criu.c
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Expand Up @@ -52,7 +52,7 @@
# endif

/* Defined in chroot_realpath.c */
char *chroot_realpath (const char *chroot, const char *path, char resolved_path[]);
char *chroot_realpath (const char *chroot, const char *path, char resolved_path[],size_t size_resolved_path);

static const char *console_socket = NULL;

Expand Down Expand Up @@ -640,7 +640,7 @@ libcrun_container_checkpoint_linux_criu (libcrun_container_status_t *status, lib
if (nofollow)
return crun_make_error (err, 0, "CRIU does not support `src-nofollow` for bind mounts");

dest_in_root = chroot_realpath (status->rootfs, def->mounts[i]->destination, buf);
dest_in_root = chroot_realpath (status->rootfs, def->mounts[i]->destination, buf, sizeof(buf));
if (UNLIKELY (dest_in_root == NULL))
{
if (errno != ENOENT)
Expand Down Expand Up @@ -971,7 +971,7 @@ libcrun_container_restore_linux_criu (libcrun_container_status_t *status, libcru
if (nofollow)
return crun_make_error (err, 0, "CRIU does not support `src-nofollow` for bind mounts");

dest_in_root = chroot_realpath (status->rootfs, def->mounts[i]->destination, buf);
dest_in_root = chroot_realpath (status->rootfs, def->mounts[i]->destination, buf,sizeof(buf));
if (UNLIKELY (dest_in_root == NULL))
{
if (errno != ENOENT)
Expand Down
4 changes: 2 additions & 2 deletions src/libcrun/utils.c
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Expand Up @@ -347,7 +347,7 @@ close_and_replace (int *oldfd, int newfd)
}

/* Defined in chroot_realpath.c */
char *chroot_realpath (const char *chroot, const char *path, char resolved_path[]);
char *chroot_realpath (const char *chroot, const char *path, char resolved_path[],size_t size_resolved_path);

static int
safe_openat_fallback (int dirfd, const char *rootfs, const char *path, int flags,
Expand All @@ -359,7 +359,7 @@ safe_openat_fallback (int dirfd, const char *rootfs, const char *path, int flags
size_t rootfs_len = strlen (rootfs);
int ret;

path_in_chroot = chroot_realpath (rootfs, path, buffer);
path_in_chroot = chroot_realpath (rootfs, path, buffer,sizeof(buffer));
if (path_in_chroot == NULL)
return crun_make_error (err, errno, "cannot resolve `%s` under rootfs", path);

Expand Down
4 changes: 2 additions & 2 deletions tests/tests_libcrun_fuzzer.c
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Expand Up @@ -111,7 +111,7 @@ test_generate_ebpf (uint8_t *buf, size_t len)
return 0;
}

char *chroot_realpath (const char *chroot, const char *path, char resolved_path[]);
char *chroot_realpath (const char *chroot, const char *path, char resolved_path[],size_t size_resolved_path);

static int
test_chroot_realpath (uint8_t *buf, size_t len)
Expand All @@ -123,7 +123,7 @@ test_chroot_realpath (uint8_t *buf, size_t len)
if (path == NULL)
return 0;

chroot_realpath (".", path, resolved_path);
chroot_realpath (".", path, resolved_path,sizeof(resolved_path));
(void) resolved_path;
return 0;
}
Expand Down
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