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author | Leo Famulari <leo@famulari.name> | 2017-12-21 02:12:55 -0500 |
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committer | Leo Famulari <leo@famulari.name> | 2017-12-21 12:28:47 -0500 |
commit | 0c9c9526bb3fb665997b3b054f8b57ffdb559043 (patch) | |
tree | e1bae92a8873494f1efe7a42f7e93b6ec2f73eb3 /gnu/packages/patches | |
parent | 2a0e3d163581f053138508b0d40a28e07dc37923 (diff) | |
download | guix-0c9c9526bb3fb665997b3b054f8b57ffdb559043.tar.gz |
gnu: libxslt: Fix CVE-2017-5029 and re-apply the fix for CVE-2016-4738.
This is a followup to commit 2663c38826cd6c2ef0c5119f8072fac8e89b2e9b. * gnu/packages/xml.scm (libxslt)[replacement]: New field. (libxslt/fixed): New variable. * gnu/packages/patches/libxslt-CVE-2017-5029.patch: New file. * gnu/local.mk (dist_patch_DATA): Add it.
Diffstat (limited to 'gnu/packages/patches')
-rw-r--r-- | gnu/packages/patches/libxslt-CVE-2017-5029.patch | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/gnu/packages/patches/libxslt-CVE-2017-5029.patch b/gnu/packages/patches/libxslt-CVE-2017-5029.patch new file mode 100644 index 0000000000..cd86928b21 --- /dev/null +++ b/gnu/packages/patches/libxslt-CVE-2017-5029.patch @@ -0,0 +1,82 @@ +Fix CVE-2017-5029: + +https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5029 + +Patch copied from upstream source repository: + +https://git.gnome.org/browse/libxslt/commit/?id=08ab2774b870de1c7b5a48693df75e8154addae5 + +From 08ab2774b870de1c7b5a48693df75e8154addae5 Mon Sep 17 00:00:00 2001 +From: Nick Wellnhofer <wellnhofer@aevum.de> +Date: Thu, 12 Jan 2017 15:39:52 +0100 +Subject: [PATCH] Check for integer overflow in xsltAddTextString + +Limit buffer size in xsltAddTextString to INT_MAX. The issue can be +exploited to trigger an out of bounds write on 64-bit systems. + +Originally reported to Chromium: + +https://crbug.com/676623 +--- + libxslt/transform.c | 25 ++++++++++++++++++++++--- + libxslt/xsltInternals.h | 4 ++-- + 2 files changed, 24 insertions(+), 5 deletions(-) + +diff --git a/libxslt/transform.c b/libxslt/transform.c +index 519133fc..02bff34a 100644 +--- a/libxslt/transform.c ++++ b/libxslt/transform.c +@@ -813,13 +813,32 @@ xsltAddTextString(xsltTransformContextPtr ctxt, xmlNodePtr target, + return(target); + + if (ctxt->lasttext == target->content) { ++ int minSize; + +- if (ctxt->lasttuse + len >= ctxt->lasttsize) { ++ /* Check for integer overflow accounting for NUL terminator. */ ++ if (len >= INT_MAX - ctxt->lasttuse) { ++ xsltTransformError(ctxt, NULL, target, ++ "xsltCopyText: text allocation failed\n"); ++ return(NULL); ++ } ++ minSize = ctxt->lasttuse + len + 1; ++ ++ if (ctxt->lasttsize < minSize) { + xmlChar *newbuf; + int size; ++ int extra; ++ ++ /* Double buffer size but increase by at least 100 bytes. */ ++ extra = minSize < 100 ? 100 : minSize; ++ ++ /* Check for integer overflow. */ ++ if (extra > INT_MAX - ctxt->lasttsize) { ++ size = INT_MAX; ++ } ++ else { ++ size = ctxt->lasttsize + extra; ++ } + +- size = ctxt->lasttsize + len + 100; +- size *= 2; + newbuf = (xmlChar *) xmlRealloc(target->content,size); + if (newbuf == NULL) { + xsltTransformError(ctxt, NULL, target, +diff --git a/libxslt/xsltInternals.h b/libxslt/xsltInternals.h +index 060b1783..5ad17719 100644 +--- a/libxslt/xsltInternals.h ++++ b/libxslt/xsltInternals.h +@@ -1754,8 +1754,8 @@ struct _xsltTransformContext { + * Speed optimization when coalescing text nodes + */ + const xmlChar *lasttext; /* last text node content */ +- unsigned int lasttsize; /* last text node size */ +- unsigned int lasttuse; /* last text node use */ ++ int lasttsize; /* last text node size */ ++ int lasttuse; /* last text node use */ + /* + * Per Context Debugging + */ +-- +2.15.1 + |