diff options
Diffstat (limited to 'gnu/packages/patches/libx11-CVE-2016-7943.patch')
| -rw-r--r-- | gnu/packages/patches/libx11-CVE-2016-7943.patch | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/gnu/packages/patches/libx11-CVE-2016-7943.patch b/gnu/packages/patches/libx11-CVE-2016-7943.patch new file mode 100644 index 0000000000..7bcbc58dd4 --- /dev/null +++ b/gnu/packages/patches/libx11-CVE-2016-7943.patch @@ -0,0 +1,113 @@ +Fix CVE-2016-7943: + +https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7943. + +Patch copied from upstream source repository: + +https://cgit.freedesktop.org/xorg/lib/libX11/commit/?id=8c29f1607a31dac0911e45a0dd3d74173822b3c9 + +From 8c29f1607a31dac0911e45a0dd3d74173822b3c9 Mon Sep 17 00:00:00 2001 +From: Tobias Stoeckmann <tobias@stoeckmann.org> +Date: Sun, 25 Sep 2016 21:22:57 +0200 +Subject: [PATCH] The validation of server responses avoids out of boundary + accesses. + +v2: FontNames.c return a NULL list whenever a single +length field from the server is incohent. + +Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org> +Reviewed-by: Matthieu Herrb <matthieu@herrb.eu> +--- + src/FontNames.c | 23 +++++++++++++++++------ + src/ListExt.c | 12 ++++++++---- + src/ModMap.c | 3 ++- + 3 files changed, 27 insertions(+), 11 deletions(-) + +diff --git a/src/FontNames.c b/src/FontNames.c +index 21dcafe..e55f338 100644 +--- a/src/FontNames.c ++++ b/src/FontNames.c +@@ -66,7 +66,7 @@ int *actualCount) /* RETURN */ + + if (rep.nFonts) { + flist = Xmalloc (rep.nFonts * sizeof(char *)); +- if (rep.length < (INT_MAX >> 2)) { ++ if (rep.length > 0 && rep.length < (INT_MAX >> 2)) { + rlen = rep.length << 2; + ch = Xmalloc(rlen + 1); + /* +1 to leave room for last null-terminator */ +@@ -93,11 +93,22 @@ int *actualCount) /* RETURN */ + if (ch + length < chend) { + flist[i] = ch + 1; /* skip over length */ + ch += length + 1; /* find next length ... */ +- length = *(unsigned char *)ch; +- *ch = '\0'; /* and replace with null-termination */ +- count++; +- } else +- flist[i] = NULL; ++ if (ch <= chend) { ++ length = *(unsigned char *)ch; ++ *ch = '\0'; /* and replace with null-termination */ ++ count++; ++ } else { ++ Xfree(flist); ++ flist = NULL; ++ count = 0; ++ break; ++ } ++ } else { ++ Xfree(flist); ++ flist = NULL; ++ count = 0; ++ break; ++ } + } + } + *actualCount = count; +diff --git a/src/ListExt.c b/src/ListExt.c +index be6b989..0516e45 100644 +--- a/src/ListExt.c ++++ b/src/ListExt.c +@@ -55,7 +55,7 @@ char **XListExtensions( + + if (rep.nExtensions) { + list = Xmalloc (rep.nExtensions * sizeof (char *)); +- if (rep.length < (INT_MAX >> 2)) { ++ if (rep.length > 0 && rep.length < (INT_MAX >> 2)) { + rlen = rep.length << 2; + ch = Xmalloc (rlen + 1); + /* +1 to leave room for last null-terminator */ +@@ -80,9 +80,13 @@ char **XListExtensions( + if (ch + length < chend) { + list[i] = ch+1; /* skip over length */ + ch += length + 1; /* find next length ... */ +- length = *ch; +- *ch = '\0'; /* and replace with null-termination */ +- count++; ++ if (ch <= chend) { ++ length = *ch; ++ *ch = '\0'; /* and replace with null-termination */ ++ count++; ++ } else { ++ list[i] = NULL; ++ } + } else + list[i] = NULL; + } +diff --git a/src/ModMap.c b/src/ModMap.c +index a809aa2..49a5d08 100644 +--- a/src/ModMap.c ++++ b/src/ModMap.c +@@ -42,7 +42,8 @@ XGetModifierMapping(register Display *dpy) + GetEmptyReq(GetModifierMapping, req); + (void) _XReply (dpy, (xReply *)&rep, 0, xFalse); + +- if (rep.length < (INT_MAX >> 2)) { ++ if (rep.length < (INT_MAX >> 2) && ++ (rep.length >> 1) == rep.numKeyPerModifier) { + nbytes = (unsigned long)rep.length << 2; + res = Xmalloc(sizeof (XModifierKeymap)); + if (res) +-- +2.10.1 + |