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gnu: busybox: Fix CVE-2021-28831.

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* gnu/packages/patches/busybox-CVE-2021-28831.patch: New patch.
* gnu/local.mk (dist_patch_DATA): Register it.
* gnu/packages/busybox.scm (busybox): Apply it.
This commit is contained in:
Léo Le Bouter 2021-03-19 11:56:38 +01:00
parent c1245f01ef
commit 572528e7dd
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GPG Key ID: 45A8B1E86BCD10A6
3 changed files with 60 additions and 1 deletions
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1
gnu/local.mk
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@ -872,6 +872,7 @@ dist_patch_DATA = \
%D%/packages/patches/blender-2.79-python-3.7-fix.patch \
%D%/packages/patches/blender-2.79-python-3.8-fix.patch \
%D%/packages/patches/bpftrace-disable-bfd-disasm.patch \
%D%/packages/patches/busybox-CVE-2021-28831.patch \
%D%/packages/patches/byobu-writable-status.patch \
%D%/packages/patches/cairo-CVE-2018-19876.patch \
%D%/packages/patches/cairo-CVE-2020-35492.patch \

3
gnu/packages/busybox.scm
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@ -41,7 +41,8 @@
version ".tar.bz2"))
(sha256
(base32
"1vhd59qmrdyrr1q7rvxmyl96z192mxl089hi87yl0hcp6fyw8mwx"))))
"1vhd59qmrdyrr1q7rvxmyl96z192mxl089hi87yl0hcp6fyw8mwx"))
(patches (search-patches "busybox-CVE-2021-28831.patch"))))
(build-system gnu-build-system)
(arguments
'(#:phases

57
gnu/packages/patches/busybox-CVE-2021-28831.patch Normal file
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@ -0,0 +1,57 @@
From f25d254dfd4243698c31a4f3153d4ac72aa9e9bd Mon Sep 17 00:00:00 2001
From: Samuel Sapalski <samuel.sapalski@nokia.com>
Date: Wed, 3 Mar 2021 16:31:22 +0100
Subject: decompress_gunzip: Fix DoS if gzip is corrupt
On certain corrupt gzip files, huft_build will set the error bit on
the result pointer. If afterwards abort_unzip is called huft_free
might run into a segmentation fault or an invalid pointer to
free(p).
In order to mitigate this, we check in huft_free if the error bit
is set and clear it before the linked list is freed.
Signed-off-by: Samuel Sapalski <samuel.sapalski@nokia.com>
Signed-off-by: Peter Kaestle <peter.kaestle@nokia.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---
archival/libarchive/decompress_gunzip.c | 12 ++++++++++--
1 file changed, 10 insertions(+), 2 deletions(-)
diff --git a/archival/libarchive/decompress_gunzip.c b/archival/libarchive/decompress_gunzip.c
index eb3b64930..e93cd5005 100644
--- a/archival/libarchive/decompress_gunzip.c
+++ b/archival/libarchive/decompress_gunzip.c
@@ -220,10 +220,20 @@ static const uint8_t border[] ALIGN1 = {
* each table.
* t: table to free
*/
+#define BAD_HUFT(p) ((uintptr_t)(p) & 1)
+#define ERR_RET ((huft_t*)(uintptr_t)1)
static void huft_free(huft_t *p)
{
huft_t *q;
+ /*
+ * If 'p' has the error bit set we have to clear it, otherwise we might run
+ * into a segmentation fault or an invalid pointer to free(p)
+ */
+ if (BAD_HUFT(p)) {
+ p = (huft_t*)((uintptr_t)(p) ^ (uintptr_t)(ERR_RET));
+ }
+
/* Go through linked list, freeing from the malloced (t[-1]) address. */
while (p) {
q = (--p)->v.t;
@@ -289,8 +299,6 @@ static unsigned fill_bitbuffer(STATE_PARAM unsigned bitbuffer, unsigned *current
* or a valid pointer to a Huffman table, ORed with 0x1 if incompete table
* is given: "fixed inflate" decoder feeds us such data.
*/
-#define BAD_HUFT(p) ((uintptr_t)(p) & 1)
-#define ERR_RET ((huft_t*)(uintptr_t)1)
static huft_t* huft_build(const unsigned *b, const unsigned n,
const unsigned s, const struct cp_ext *cp_ext,
unsigned *m)
--
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