summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorLéo Le Bouter <lle-bout@zaclys.net>2021-03-19 11:56:38 +0100
committerLéo Le Bouter <lle-bout@zaclys.net>2021-03-19 11:56:38 +0100
commit572528e7ddcf6af213c78e70eb60953a82b96a96 (patch)
tree6c93447608978a27457efff19cf37f7e6a726ba2
parentc1245f01efdc126e37a0bf432a8a1b315ccb33a5 (diff)
gnu: busybox: Fix CVE-2021-28831.
* 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.
-rw-r--r--gnu/local.mk1
-rw-r--r--gnu/packages/busybox.scm3
-rw-r--r--gnu/packages/patches/busybox-CVE-2021-28831.patch57
3 files changed, 60 insertions, 1 deletions
diff --git a/gnu/local.mk b/gnu/local.mk
index afd9c17f9c..8325c071bd 100644
--- a/gnu/local.mk
+++ b/gnu/local.mk
@@ -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 \
diff --git a/gnu/packages/busybox.scm b/gnu/packages/busybox.scm
index 5af67e084d..17c90c3c65 100644
--- a/gnu/packages/busybox.scm
+++ b/gnu/packages/busybox.scm
@@ -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
diff --git a/gnu/packages/patches/busybox-CVE-2021-28831.patch b/gnu/packages/patches/busybox-CVE-2021-28831.patch
new file mode 100644
index 0000000000..da3107fbb1
--- /dev/null
+++ b/gnu/packages/patches/busybox-CVE-2021-28831.patch
@@ -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)
+--
+cgit v1.2.1
+