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Bug#882175: marked as done (busybox: out-of-bounds read in get_header_ar())

Your message dated Wed, 12 Jan 2022 12:06:22 +0100
with message-id <3581500.OEUHVdaxbK@bagend>
and subject line Re: busybox: out-of-bounds read in get_header_ar()
has caused the Debian Bug report #882175,
regarding busybox: out-of-bounds read in get_header_ar()
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
882175: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=882175
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: busybox
Version: 1:1.27.2-1

Apparently an out-of-bounds read can happen when unpacking ar archives:

  $ valgrind -q -- busybox ar p oob.ar > /dev/null
  ==2180== Invalid read of size 1
  ==2180==    at 0x4831403: __GI_strlen (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
  ==2180==    by 0x48B9F5A: strdup (strdup.c:41)
  ==2180==    by 0x1108BC: xstrdup (xfuncs_printf.c:81)
  ==2180==    by 0x15C560: get_header_ar (get_header_ar.c:116)
  ==2180==    by 0x15C26F: unpack_ar_archive (unpack_ar_archive.c:20)
  ==2180==    by 0x14D956: ar_main (ar.c:291)
  ==2180==    by 0x10F788: run_applet_no_and_exit (appletlib.c:916)
  ==2180==    by 0x10FA50: run_applet_and_exit (appletlib.c:934)
  ==2180==    by 0x10FA38: busybox_main (appletlib.c:875)
  ==2180==    by 0x10FA38: run_applet_and_exit (appletlib.c:927)
  ==2180==    by 0x10FADC: main (appletlib.c:1032)
  ==2180==  Address 0x4a0715c is 0 bytes after a block of size 4 alloc'd
  ==2180==    at 0x482E2BC: malloc (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
  ==2180==    by 0x110847: xmalloc (xfuncs_printf.c:47)
  ==2180==    by 0x15C4A0: get_header_ar (get_header_ar.c:86)
  ==2180==    by 0x15C26F: unpack_ar_archive (unpack_ar_archive.c:20)
  ==2180==    by 0x14D956: ar_main (ar.c:291)
  ==2180==    by 0x10F788: run_applet_no_and_exit (appletlib.c:916)
  ==2180==    by 0x10FA50: run_applet_and_exit (appletlib.c:934)
  ==2180==    by 0x10FA38: busybox_main (appletlib.c:875)
  ==2180==    by 0x10FA38: run_applet_and_exit (appletlib.c:927)
  ==2180==    by 0x10FADC: main (appletlib.c:1032)
  ...

Found using American Fuzzy Lop:
http://lcamtuf.coredump.cx/afl/


-- System Information:
Architecture: i386

Versions of packages busybox depends on:
ii  libc6  2.25-1

--
Jakub Wilk

Attachment: oob.ar
Description: Binary data


--- End Message ---
--- Begin Message --- 
Version: 1:1.30.1-1

This was fixed in upstream commit 0a90960f446ebaf062244afbc626546b14689e0a and 
part of the upstream 1.29.0 release. The first version uploaded to Debian with 
that fix was 1:1.30.1-1, so close it with that version.

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