diff mbox series

file: fix CVE-2019-18218

Message ID 20191104120910.15792-1-ross.burton@intel.com
State Superseded
Headers show
Series file: fix CVE-2019-18218 | expand

Commit Message

Ross Burton Nov. 4, 2019, 12:09 p.m. UTC 
Signed-off-by: Ross Burton <ross.burton@intel.com>

---
 .../file/file/CVE-2019-18218.patch            | 55 +++++++++++++++++++
 meta/recipes-devtools/file/file_5.37.bb       |  3 +-
 2 files changed, 57 insertions(+), 1 deletion(-)
 create mode 100644 meta/recipes-devtools/file/file/CVE-2019-18218.patch

-- 
2.20.1

-- 
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diff mbox series

Patch

diff --git a/meta/recipes-devtools/file/file/CVE-2019-18218.patch b/meta/recipes-devtools/file/file/CVE-2019-18218.patch
new file mode 100644
index 00000000000..3d02c5ad4b1
--- /dev/null
+++ b/meta/recipes-devtools/file/file/CVE-2019-18218.patch
@@ -0,0 +1,55 @@ 
+cdf_read_property_info in cdf.c in file through 5.37 does not restrict the
+number of CDF_VECTOR elements, which allows a heap-based buffer overflow (4-byte
+out-of-bounds write).
+
+CVE: CVE-2019-18218
+Upstream-Status: Backport
+Signed-off-by: Ross Burton <ross.burton@intel.com>
+
+From 46a8443f76cec4b41ec736eca396984c74664f84 Mon Sep 17 00:00:00 2001
+From: Christos Zoulas <christos@zoulas.com>
+Date: Mon, 26 Aug 2019 14:31:39 +0000
+Subject: [PATCH] Limit the number of elements in a vector (found by oss-fuzz)
+
+---
+ src/cdf.c | 9 ++++-----
+ src/cdf.h | 1 +
+ 2 files changed, 5 insertions(+), 5 deletions(-)
+
+diff --git a/src/cdf.c b/src/cdf.c
+index 9d6396742..bb81d6374 100644
+--- a/src/cdf.c
++++ b/src/cdf.c
+@@ -1016,8 +1016,9 @@ cdf_read_property_info(const cdf_stream_t *sst, const cdf_header_t *h,
+ 				goto out;
+ 			}
+ 			nelements = CDF_GETUINT32(q, 1);
+-			if (nelements == 0) {
+-				DPRINTF(("CDF_VECTOR with nelements == 0\n"));
++			if (nelements > CDF_ELEMENT_LIMIT || nelements == 0) {
++				DPRINTF(("CDF_VECTOR with nelements == %"
++				    SIZE_T_FORMAT "u\n", nelements));
+ 				goto out;
+ 			}
+ 			slen = 2;
+@@ -1060,8 +1061,6 @@ cdf_read_property_info(const cdf_stream_t *sst, const cdf_header_t *h,
+ 					goto out;
+ 				inp += nelem;
+ 			}
+-			DPRINTF(("nelements = %" SIZE_T_FORMAT "u\n",
+-			    nelements));
+ 			for (j = 0; j < nelements && i < sh.sh_properties;
+ 			    j++, i++)
+ 			{
+diff --git a/src/cdf.h b/src/cdf.h
+index 2f7e554b7..05056668f 100644
+--- a/src/cdf.h
++++ b/src/cdf.h
+@@ -48,6 +48,7 @@
+ typedef int32_t cdf_secid_t;
+ 
+ #define CDF_LOOP_LIMIT					10000
++#define CDF_ELEMENT_LIMIT				100000
+ 
+ #define CDF_SECID_NULL					0
+ #define CDF_SECID_FREE					-1
diff --git a/meta/recipes-devtools/file/file_5.37.bb b/meta/recipes-devtools/file/file_5.37.bb
index c53a120b840..71801f9d479 100644
--- a/meta/recipes-devtools/file/file_5.37.bb
+++ b/meta/recipes-devtools/file/file_5.37.bb
@@ -14,7 +14,8 @@  DEPENDS_class-native = "zlib-native"
 # Blacklist a bogus tag in upstream check
 UPSTREAM_CHECK_GITTAGREGEX = "FILE(?P<pver>(?!6_23).+)"
 
-SRC_URI = "git://github.com/file/file.git"
+SRC_URI = "git://github.com/file/file.git \
+           file://CVE-2019-18218.patch"
 
 SRCREV = "a0d5b0e4e9f97d74a9911e95cedd579852e25398"
 S = "${WORKDIR}/git"