diff options
Diffstat (limited to 'community/mupdf/mupdf-1.3-stack-buffer-overflow-in-xps_parse_color.patch')
| -rw-r--r-- | community/mupdf/mupdf-1.3-stack-buffer-overflow-in-xps_parse_color.patch | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/community/mupdf/mupdf-1.3-stack-buffer-overflow-in-xps_parse_color.patch b/community/mupdf/mupdf-1.3-stack-buffer-overflow-in-xps_parse_color.patch new file mode 100644 index 000000000..bfe86f320 --- /dev/null +++ b/community/mupdf/mupdf-1.3-stack-buffer-overflow-in-xps_parse_color.patch @@ -0,0 +1,135 @@ +From 60dabde18d7fe12b19da8b509bdfee9cc886aafc Mon Sep 17 00:00:00 2001 +From: =?utf8?q?Simon=20B=C3=BCnzli?= <zeniko@gmail.com> +Date: Thu, 16 Jan 2014 22:04:51 +0100 +Subject: [PATCH] Bug 694957: fix stack buffer overflow in xps_parse_color +MIME-Version: 1.0 +Content-Type: text/plain; charset=utf8 +Content-Transfer-Encoding: 8bit + +xps_parse_color happily reads more than FZ_MAX_COLORS values out of a +ContextColor array which overflows the passed in samples array. +Limiting the number of allowed samples to FZ_MAX_COLORS and make sure +to use that constant for all callers fixes the problem. + +Thanks to Jean-Jamil Khalifé for reporting and investigating the issue +and providing a sample exploit file. +--- + source/xps/xps-common.c | 22 ++++++++++++++-------- + source/xps/xps-glyphs.c | 2 +- + source/xps/xps-gradient.c | 2 +- + source/xps/xps-path.c | 2 +- + 4 files changed, 17 insertions(+), 11 deletions(-) + +diff --git a/source/xps/xps-common.c b/source/xps/xps-common.c +index b780f42..32a30ba 100644 +--- a/source/xps/xps-common.c ++++ b/source/xps/xps-common.c +@@ -89,7 +89,7 @@ xps_begin_opacity(xps_document *doc, const fz_matrix *ctm, const fz_rect *area, + if (scb_color_att) + { + fz_colorspace *colorspace; +- float samples[32]; ++ float samples[FZ_MAX_COLORS]; + xps_parse_color(doc, base_uri, scb_color_att, &colorspace, samples); + opacity = opacity * samples[0]; + } +@@ -208,12 +208,13 @@ void + xps_parse_color(xps_document *doc, char *base_uri, char *string, + fz_colorspace **csp, float *samples) + { ++ fz_context *ctx = doc->ctx; + char *p; + int i, n; + char buf[1024]; + char *profile; + +- *csp = fz_device_rgb(doc->ctx); ++ *csp = fz_device_rgb(ctx); + + samples[0] = 1; + samples[1] = 0; +@@ -259,7 +260,7 @@ xps_parse_color(xps_document *doc, char *base_uri, char *string, + profile = strchr(buf, ' '); + if (!profile) + { +- fz_warn(doc->ctx, "cannot find icc profile uri in '%s'", string); ++ fz_warn(ctx, "cannot find icc profile uri in '%s'", string); + return; + } + +@@ -267,12 +268,17 @@ xps_parse_color(xps_document *doc, char *base_uri, char *string, + p = strchr(profile, ' '); + if (!p) + { +- fz_warn(doc->ctx, "cannot find component values in '%s'", profile); ++ fz_warn(ctx, "cannot find component values in '%s'", profile); + return; + } + + *p++ = 0; + n = count_commas(p) + 1; ++ if (n > FZ_MAX_COLORS) ++ { ++ fz_warn(ctx, "ignoring %d color components (max %d allowed)", n - FZ_MAX_COLORS, FZ_MAX_COLORS); ++ n = FZ_MAX_COLORS; ++ } + i = 0; + while (i < n) + { +@@ -292,10 +298,10 @@ xps_parse_color(xps_document *doc, char *base_uri, char *string, + /* TODO: load ICC profile */ + switch (n) + { +- case 2: *csp = fz_device_gray(doc->ctx); break; +- case 4: *csp = fz_device_rgb(doc->ctx); break; +- case 5: *csp = fz_device_cmyk(doc->ctx); break; +- default: *csp = fz_device_gray(doc->ctx); break; ++ case 2: *csp = fz_device_gray(ctx); break; ++ case 4: *csp = fz_device_rgb(ctx); break; ++ case 5: *csp = fz_device_cmyk(ctx); break; ++ default: *csp = fz_device_gray(ctx); break; + } + } + } +diff --git a/source/xps/xps-glyphs.c b/source/xps/xps-glyphs.c +index b26e18d..e621257 100644 +--- a/source/xps/xps-glyphs.c ++++ b/source/xps/xps-glyphs.c +@@ -590,7 +590,7 @@ xps_parse_glyphs(xps_document *doc, const fz_matrix *ctm, + + if (fill_att) + { +- float samples[32]; ++ float samples[FZ_MAX_COLORS]; + fz_colorspace *colorspace; + + xps_parse_color(doc, base_uri, fill_att, &colorspace, samples); +diff --git a/source/xps/xps-gradient.c b/source/xps/xps-gradient.c +index 7d03f89..76188e9 100644 +--- a/source/xps/xps-gradient.c ++++ b/source/xps/xps-gradient.c +@@ -39,7 +39,7 @@ xps_parse_gradient_stops(xps_document *doc, char *base_uri, fz_xml *node, + struct stop *stops, int maxcount) + { + fz_colorspace *colorspace; +- float sample[8]; ++ float sample[FZ_MAX_COLORS]; + float rgb[3]; + int before, after; + int count; +diff --git a/source/xps/xps-path.c b/source/xps/xps-path.c +index b97ee17..ea84a81 100644 +--- a/source/xps/xps-path.c ++++ b/source/xps/xps-path.c +@@ -826,7 +826,7 @@ xps_parse_path(xps_document *doc, const fz_matrix *ctm, char *base_uri, xps_reso + + fz_stroke_state *stroke = NULL; + fz_matrix transform; +- float samples[32]; ++ float samples[FZ_MAX_COLORS]; + fz_colorspace *colorspace; + fz_path *path = NULL; + fz_path *stroke_path = NULL; +-- +1.7.9.5 + |