bugThe FreeType Project - Bugs: bug #45922, buffer overflow in skip_comment...


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bug #45922: buffer overflow in skip_comment while doing FT_New_Memory_Face

Submitted by:  Kostya Serebryany <kcc>
Submitted on:  Fri 11 Sep 2015 06:18:30 AM UTC
Severity:  3 - Normal Item Group:  Crash
Status:  Fixed Privacy:  Public
Assigned to:  wl Open/Closed:  Closed
Planned Release:  2.6.1
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Sat 12 Sep 2015 06:33:50 AM UTC, comment #1: 

Fixed in git, thanks!

Werner LEMBERG <wl>
Project Administrator
Fri 11 Sep 2015 06:18:30 AM UTC, original submission:  

found on fresh git with libFuzzer+AddressSanitizer

#include <ft2build.h>
#include FT_FREETYPE_H
#include <assert.h>
#include <stdlib.h>
#include <string.h>
static FT_Library  library;
void TestOneInput(const unsigned char *data, size_t size) {
  FT_Face face;
  if (size < 1) return;
  if (!FT_New_Memory_Face(library, data, size, 0, &face)) {
unsigned char a[] = {
    0x25, 0x21, 0x46, 0x6f, 0x6e, 0x74, 0x54, 0x79, 0x70, 0x65, 0x31, 0x2d,
    0x31, 0x2e, 0x30, 0x3a, 0x20, 0x2f, 0x54, 0x54, 0x41, 0x35, 0x41, 0x39,
    0x6f, 0x30, 0x30, 0x2b, 0x5a, 0x45, 0x56, 0x48, 0x50, 0x65, 0x2d, 0x31,
    0x20, 0x30, 0x30, 0x31, 0x2e, 0x30, 0x30, 0x33, 0xd,  0x31, 0x31, 0x22,
    0x64, 0x69, 0x63, 0x74, 0x20, 0x62, 0x65, 0x67, 0x69, 0x6f, 0x6e, 0x6e,
    0xd,  0x46, 0x2f, 0x74, 0x54, 0x79, 0x70, 0x31, 0x20, 0x65, 0x20, 0x2f,
    0x65, 0x66, 0x64, 0xd,  0x46, 0x6f, 0x6e, 0x74, 0x4d, 0x61, 0x74, 0x72,
    0x69, 0x78, 0x20, 0x5b, 0x30, 0x2e, 0x30, 0x31, 0x20, 0x30, 0x20, 0x30,
    0x20, 0x30, 0x2e, 0x30, 0x30, 0x31, 0x20, 0x30, 0x20, 0x30, 0x5d, 0x20,
    0x72, 0x65, 0x61, 0x64, 0x6f, 0x6e, 0x6c, 0x79, 0x20, 0x64, 0x65, 0x66,
    0xd,  0x2d, 0x46, 0x6f, 0x6e, 0x74, 0x4e, 0x61, 0xf2, 0x6d, 0x65, 0x20,
    0x2f, 0x54, 0x41, 0x30, 0x41, 0x39, 0x6f, 0x30, 0x30, 0x2b, 0x5a, 0x45,
    0x56, 0x48, 0x50, 0x45, 0x2d, 0x31, 0x20, 0x64, 0x65, 0x66, 0xd,  0x2f,
    0x46, 0x6f, 0x6e, 0x74, 0x42, 0x42, 0x6f, 0x78, 0x25, 0x21, 0x50, 0x53,
    0x2d, 0x41, 0x64, 0x65, 0x6f, 0x6f, 0x62, 0x46, 0x6e, 0x74, 0x2d, 0x31,
    0x4f, 0x54, 0x54, 0x4f, 0x0,  0x9,  0x80, 0x0,  0x3,  0x0,  0x10, 0x43,
    0x80, 0x1,  0x1b, 0xe,  0x0,  0x0,  0x25, 0x21, 0x50, 0x2d, 0x41, 0x64,
    0x6f, 0x62, 0x65, 0x46, 0x6f, 0x6e, 0x74, 0x2d, 0x31, 0x2e, 0x31, 0x3a,
    0x20, 0x43, 0x4d, 0x52, 0x31, 0x30, 0x20, 0x31, 0x2e, 0x30, 0x30, 0x42,
    0xd,  0x3c, 0x25, 0x25, 0x43, 0x72, 0x65, 0x61, 0x74, 0x69, 0x6f, 0x6e,
    0x44, 0x61, 0x74, 0x65, 0x3a, 0x20, 0x31, 0x39, 0x39, 0x32, 0x20, 0x46,
    0x65, 0x62, 0x20, 0x39};
int main(int argc, char **argv) {
  if (FT_Init_FreeType(&library)) {
    printf("Could not initialize library.\n");
    return 1;
  TestOneInput(a, sizeof(a));

==7310==ERROR: AddressSanitizer: global-buffer-overflow on address 0x000000897da0 at pc 0x00000061bdb0 bp 0x7ffd08d2db50 sp 0x7ffd08d2db48
READ of size 1 at 0x000000897da0 thread T0
    #0 0x61bdaf in skip_comment src/psaux/psobjs.c:293:12
    #1 0x61bdaf in skip_spaces src/psaux/psobjs.c:315
    #2 0x61bdaf in ps_parser_skip_spaces src/psaux/psobjs.c:605
    #3 0x61bdaf in ps_parser_to_token src/psaux/psobjs.c:626
    #4 0x61c449 in ps_parser_load_field src/psaux/psobjs.c:1059:7
    #5 0x534d8f in t1_load_keyword src/type1/t1load.c:1016:17
    #6 0x534d8f in parse_dict src/type1/t1load.c:2005
    #7 0x528466 in T1_Open_Face src/type1/t1load.c:2113:13
    #8 0x528466 in T1_Face_Init src/type1/t1objs.c:339
    #9 0x4debc4 in open_face src/base/ftobjs.c:1166:15
    #10 0x4dd6ff in FT_Open_Face src/base/ftobjs.c:2152:19
    #11 0x4de85c in FT_New_Memory_Face src/base/ftobjs.c:1256:12
    #12 0x4d449a in TestOneInput (/usr/local/google/home/kcc/fuzz/freetype/repro_asan+0x4d449a)
    #13 0x4d4586 in main (/usr/local/google/home/kcc/fuzz/freetype/repro_asan+0x4d4586)
    #14 0x7f424f36dec4 in __libc_start_main /build/buildd/eglibc-2.19/csu/libc-start.c:287
    #15 0x41c145 in _start (/usr/local/google/home/kcc/fuzz/freetype/repro_asan+0x41c145)

0x000000897da0 is located 0 bytes to the right of global variable 'a' defined in './repro1.c:14:15' (0x897ca0) of size 256

Kostya Serebryany <kcc>
Project Member


(Note: upload size limit is set to 16384 kB, after insertion of the required escape characters.)

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    Follow 5 latest changes.

    Date Changed by Updated Field Previous Value => Replaced by
    2015-09-12 wl Item GroupNone => Crash
        StatusNone => Fixed
        Assigned toNone => wl
        Open/ClosedOpen => Closed
        Planned ReleaseNone => 2.6.1

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