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Fix CVE-2016-2037 (out of bounds write in process_copy_in()).
Copied from upstream mailing list:
https://lists.gnu.org/archive/html/bug-cpio/2016-01/msg00005.html
---
Other calls to cpio_safer_name_suffix seem to be safe.
.
* src/copyin.c (process_copy_in): Make sure that file_hdr.c_name
has at least two bytes allocated.
* src/util.c (cpio_safer_name_suffix): Document that use of this
function requires to be careful.
Author: Pavel Raiskup <praiskup@redhat.com>
---
src/copyin.c | 2 ++
src/util.c | 5 ++++-
2 files changed, 6 insertions(+), 1 deletion(-)
Index: cpio-2.11+dfsg/src/copyin.c
===================================================================
--- cpio-2.11+dfsg.orig/src/copyin.c
+++ cpio-2.11+dfsg/src/copyin.c
@@ -1433,6 +1433,8 @@ process_copy_in ()
break;
}
+ if (file_hdr.c_namesize <= 1)
+ file_hdr.c_name = xrealloc(file_hdr.c_name, 2);
cpio_safer_name_suffix (file_hdr.c_name, false, !no_abs_paths_flag,
false);
Index: cpio-2.11+dfsg/src/util.c
===================================================================
--- cpio-2.11+dfsg.orig/src/util.c
+++ cpio-2.11+dfsg/src/util.c
@@ -1374,7 +1374,10 @@ set_file_times (int fd,
}
/* Do we have to ignore absolute paths, and if so, does the filename
- have an absolute path? */
+ have an absolute path?
+ Before calling this function make sure that the allocated NAME buffer has
+ capacity at least 2 bytes to allow us to store the "." string inside. */
+
void
cpio_safer_name_suffix (char *name, bool link_target, bool absolute_names,
bool strip_leading_dots)
|
