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authorChen Qi <Qi.Chen@windriver.com>2021-04-07 21:55:18 -0700
committerAnuj Mittal <anuj.mittal@intel.com>2021-04-20 10:37:33 +0800
commit147a08dced5e565f19f4987a3c199780dc00f878 (patch)
treee199eef91dfe605a23cd5ee84e74c6f2bfa2d724
parent30cf99e92f4ccaa13a685c987b3b77aeb966d7f7 (diff)
downloadopenembedded-core-contrib-147a08dced5e565f19f4987a3c199780dc00f878.tar.gz
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busybox: fix CVE-2021-28831
Backport patch to fix CVE-2021-28831. Signed-off-by: Chen Qi <Qi.Chen@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org> (cherry picked from commit e579dbd9a6b2472ca90f411c0b594da9e38c9aca) Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
-rw-r--r--meta/recipes-core/busybox/busybox/0001-decompress_gunzip-Fix-DoS-if-gzip-is-corrupt.patch58
-rw-r--r--meta/recipes-core/busybox/busybox_1.32.0.bb3
2 files changed, 60 insertions, 1 deletions
diff --git a/meta/recipes-core/busybox/busybox/0001-decompress_gunzip-Fix-DoS-if-gzip-is-corrupt.patch b/meta/recipes-core/busybox/busybox/0001-decompress_gunzip-Fix-DoS-if-gzip-is-corrupt.patch
new file mode 100644
index 00000000000..67c9f189cc0
--- /dev/null
+++ b/meta/recipes-core/busybox/busybox/0001-decompress_gunzip-Fix-DoS-if-gzip-is-corrupt.patch
@@ -0,0 +1,58 @@
+From fe791386ebc270219ca00406c9fdadc5130b64ee Mon Sep 17 00:00:00 2001
+From: Samuel Sapalski <samuel.sapalski@nokia.com>
+Date: Wed, 3 Mar 2021 16:31:22 +0100
+Subject: [PATCH] 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>
+
+Upstream-Status: Backport
+CVE: CVE-2021-28831
+Signed-off-by: Chen Qi <Qi.Chen@windriver.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)
diff --git a/meta/recipes-core/busybox/busybox_1.32.0.bb b/meta/recipes-core/busybox/busybox_1.32.0.bb
index 8e23b0d4a28..b91f7cf711f 100644
--- a/meta/recipes-core/busybox/busybox_1.32.0.bb
+++ b/meta/recipes-core/busybox/busybox_1.32.0.bb
@@ -46,7 +46,8 @@ SRC_URI = "https://busybox.net/downloads/busybox-${PV}.tar.bz2;name=tarball \
file://0001-hwclock-make-glibc-2.31-compatible.patch \
file://rev.cfg \
file://pgrep.cfg \
-"
+ file://0001-decompress_gunzip-Fix-DoS-if-gzip-is-corrupt.patch \
+ "
SRC_URI_append_libc-musl = " file://musl.cfg "
SRC_URI[tarball.md5sum] = "9576986f1a960da471d03b72a62f13c7"