bugmake - Bugs: bug #45050, Invalid read / heap overflow in...

 
 

bug #45050: Invalid read / heap overflow in unescape_char()

Submitted by:  Hanno Boeck <hanno>
Submitted on:  Thu 07 May 2015 10:12:01 PM UTC  
 
Severity: 3 - NormalItem Group: None
Status: FixedPrivacy: Public
Assigned to: Paul D. Smith <psmith>Open/Closed: Closed
Component Version: 4.1Operating System: None
Fixed Release: 4.2Triage Status: None

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Mon 13 Jul 2015 04:14:41 AM UTC, comment #2:

I pushed a fix for this to Git. Thanks for the report!

Paul D. Smith <psmith>
Project AdministratorIn charge of this item.
Mon 11 May 2015 01:30:51 AM UTC, comment #1:

after some check, I believe that the problem is in the code:

char * unescape_char(char *string, int c) {
.....

/* here, s can point to 0, however, after ++, the s might skip the 0 and continue reading "wild memory" */
(p++) = (s++);
.....
}

chen <chenzero>
Thu 07 May 2015 10:12:01 PM UTC, original submission:

Attached file will cause a heap overflow / invalid read error in make. This can be seen with address sanitizer or valgrind.

I'll attach Address Sanitizer output. This was found with american fuzzy lop.

Hanno Boeck <hanno>

 

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

Attach File(s):
   
   
Comment:
   

Attached Files
file #33960:  Makefile.heapoverflow-unescape_char added by hanno (3B - application/octet-stream)

 

Depends on the following items: None found

Items that depend on this one: None found

 

Carbon-Copy List
  • -unavailable- added by psmith (Posted a comment)
  • -unavailable- added by chenzero (Posted a comment)
  • -unavailable- added by hanno (Submitted the item)
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    Follow 7 latest changes.

    Date Changed By Updated Field Previous Value => Replaced By
    Mon 13 Jul 2015 04:14:41 AM UTCpsmithComponent VersionNone=>4.1
      Fixed ReleaseNone=>4.2
    Mon 13 Jul 2015 04:14:40 AM UTCpsmithStatusNone=>Fixed
      Assigned toNone=>psmith
      Open/ClosedOpen=>Closed
    Thu 07 May 2015 10:12:01 PM UTChannoAttached File-=>Added Makefile.heapoverflow-unescape_char, #33960
      Attached File-=>Added Makefile.heapoverflow-unescape_char.asan.txt, #33961

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