* [Bug general/23786] New: Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174
@ 2018-10-17 8:37 wcventure at 126 dot com
2018-10-17 8:38 ` [Bug general/23786] " wcventure at 126 dot com
` (9 more replies)
0 siblings, 10 replies; 11+ messages in thread
From: wcventure at 126 dot com @ 2018-10-17 8:37 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=23786
Bug ID: 23786
Summary: Divide-by-zero Problem in function arlib_add_symbols()
in arlib.c in elfutils-0.174
Product: elfutils
Version: unspecified
Status: UNCONFIRMED
Severity: critical
Priority: P2
Component: general
Assignee: unassigned at sourceware dot org
Reporter: wcventure at 126 dot com
CC: elfutils-devel at sourceware dot org
Target Milestone: ---
Hi,
I found some floating point exception in function arlib_add_symbols() in
arlib.c of the latest elfutils-0.174 code base. I have confirmed them with GDB
and Address Sanitizer.
Here are the POC files. Please use " ./eu-ranlib $POC " to reproduce this bug.
I'll also show you the debugging process. It seems that this is caused by the
divide-by-zero.
In arlib.c:255, there exist a division calculation:
> int nsyms = shdr->sh_size / shdr->sh_entsize;
I can provide you some testcases to make shdr->sh_entsize = 0. And you can use
the testcases to reproduce the bug. Divide by zero is bad. We need to make a
check before doing division calculation.
--- Comment #1 from wcventure <wcventure at 126 dot com> ---
Created attachment 11336
--> https://sourceware.org/bugzilla/attachment.cgi?id=11336&action=edit
POC1
I have also confirmed them with Address Sanitizer.
The ASAN dumps the stack trace as follows:
ASAN:DEADLYSIGNAL
=================================================================
==2496==ERROR: AddressSanitizer: FPE on unknown address 0x0000004065d8 (pc
0x0000004065d8 bp 0x7ffd4c109620 sp 0x7ffd4c109550 T0)
#0 0x4065d7 in arlib_add_symbols
/media/hjwang/01D3344861A8D2E0/wcventure/Project/elfutils/src/arlib.c:255
#1 0x4029c5 in handle_file
/media/hjwang/01D3344861A8D2E0/wcventure/Project/elfutils/src/ranlib.c:193
#2 0x4029c5 in main
/media/hjwang/01D3344861A8D2E0/wcventure/Project/elfutils/src/ranlib.c:110
#3 0x7fc97b51982f in __libc_start_main
(/lib/x86_64-linux-gnu/libc.so.6+0x2082f)
#4 0x403d28 in _start
(/media/hjwang/01D3344861A8D2E0/wcventure/Project/elfutils/build/bin/eu-ranlib+0x403d28)
AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: FPE
/media/hjwang/01D3344861A8D2E0/wcventure/Project/elfutils/src/arlib.c:255 in
arlib_add_symbols
==2496==ABORTING
Aborted
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* [Bug general/23786] Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174
2018-10-17 8:37 [Bug general/23786] New: Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174 wcventure at 126 dot com
@ 2018-10-17 8:38 ` wcventure at 126 dot com
2018-10-18 17:03 ` mark at klomp dot org
` (8 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: wcventure at 126 dot com @ 2018-10-17 8:38 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=23786
--- Comment #2 from wcventure <wcventure at 126 dot com> ---
Created attachment 11337
--> https://sourceware.org/bugzilla/attachment.cgi?id=11337&action=edit
POC2
Please use " ./eu-ranlib $POC " to reproduce this bug. This bug was discovered
by NTU Cyber-Security-Lab, for fuzzing research work. If you have any
questions, please let me know.
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* [Bug general/23786] Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174
2018-10-17 8:37 [Bug general/23786] New: Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174 wcventure at 126 dot com
2018-10-17 8:38 ` [Bug general/23786] " wcventure at 126 dot com
@ 2018-10-18 17:03 ` mark at klomp dot org
2018-10-19 22:58 ` mark at klomp dot org
` (7 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: mark at klomp dot org @ 2018-10-18 17:03 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=23786
Mark Wielaard <mark at klomp dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-10-18
CC| |mark at klomp dot org
Ever confirmed|0 |1
--- Comment #3 from Mark Wielaard <mark at klomp dot org> ---
Thanks for the report. Proposed fix posted:
https://sourceware.org/ml/elfutils-devel/2018-q4/msg00055.html
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* [Bug general/23786] Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174
2018-10-17 8:37 [Bug general/23786] New: Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174 wcventure at 126 dot com
2018-10-17 8:38 ` [Bug general/23786] " wcventure at 126 dot com
2018-10-18 17:03 ` mark at klomp dot org
@ 2018-10-19 22:58 ` mark at klomp dot org
2018-11-14 11:50 ` mark at klomp dot org
` (6 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: mark at klomp dot org @ 2018-10-19 22:58 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=23786
Mark Wielaard <mark at klomp dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Mark Wielaard <mark at klomp dot org> ---
commit 2b16a9be69939822dcafe075413468daac98b327
Author: Mark Wielaard <mark@klomp.org>
Date: Thu Oct 18 19:01:52 2018 +0200
arlib: Check that sh_entsize isn't zero.
A bogus ELF file could have sh_entsize as zero. Don't divide by zero,
but just assume there are no symbols in the section.
https://sourceware.org/bugzilla/show_bug.cgi?id=23786
Signed-off-by: Mark Wielaard <mark@klomp.org>
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* [Bug general/23786] Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174
2018-10-17 8:37 [Bug general/23786] New: Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174 wcventure at 126 dot com
` (2 preceding siblings ...)
2018-10-19 22:58 ` mark at klomp dot org
@ 2018-11-14 11:50 ` mark at klomp dot org
2018-11-14 11:56 ` [Bug tools/23786] " mark at klomp dot org
` (5 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: mark at klomp dot org @ 2018-11-14 11:50 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=23786
--- Comment #5 from Mark Wielaard <mark at klomp dot org> ---
For reference this was assigned CVE-2018-18521.
Note that this bug was not in a generic library, just in the code shared by the
eu-ar and eu-ranlib binaries.
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* [Bug tools/23786] Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174
2018-10-17 8:37 [Bug general/23786] New: Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174 wcventure at 126 dot com
` (3 preceding siblings ...)
2018-11-14 11:50 ` mark at klomp dot org
@ 2018-11-14 11:56 ` mark at klomp dot org
2020-03-16 9:10 ` mda.feedbck at gmail dot com
` (4 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: mark at klomp dot org @ 2018-11-14 11:56 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=23786
Mark Wielaard <mark at klomp dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Component|general |tools
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* [Bug tools/23786] Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174
2018-10-17 8:37 [Bug general/23786] New: Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174 wcventure at 126 dot com
` (4 preceding siblings ...)
2018-11-14 11:56 ` [Bug tools/23786] " mark at klomp dot org
@ 2020-03-16 9:10 ` mda.feedbck at gmail dot com
2020-08-21 9:42 ` scottswayer at gmail dot com
` (3 subsequent siblings)
9 siblings, 0 replies; 11+ messages in thread
From: mda.feedbck at gmail dot com @ 2020-03-16 9:10 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=23786
alaha <mda.feedbck at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |mda.feedbck at gmail dot com
--- Comment #6 from alaha <mda.feedbck at gmail dot com> ---
Bully Anniversary Edition: https://modandroidapk.com/bully-anniversary-edition/
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* [Bug tools/23786] Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174
2018-10-17 8:37 [Bug general/23786] New: Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174 wcventure at 126 dot com
` (5 preceding siblings ...)
2020-03-16 9:10 ` mda.feedbck at gmail dot com
@ 2020-08-21 9:42 ` scottswayer at gmail dot com
2020-11-22 14:50 ` hegdemegha216 at gmail dot com
` (2 subsequent siblings)
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From: scottswayer at gmail dot com @ 2020-08-21 9:42 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=23786
Scott Swayer <scottswayer at gmail dot com> changed:
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CC| |scottswayer at gmail dot com
--- Comment #7 from Scott Swayer <scottswayer at gmail dot com> ---
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* [Bug tools/23786] Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174
2018-10-17 8:37 [Bug general/23786] New: Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174 wcventure at 126 dot com
` (6 preceding siblings ...)
2020-08-21 9:42 ` scottswayer at gmail dot com
@ 2020-11-22 14:50 ` hegdemegha216 at gmail dot com
2021-01-13 18:29 ` ittech.euh at gmail dot com
2021-01-13 19:09 ` mark at klomp dot org
9 siblings, 0 replies; 11+ messages in thread
From: hegdemegha216 at gmail dot com @ 2020-11-22 14:50 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=23786
megha <hegdemegha216 at gmail dot com> changed:
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CC| |hegdemegha216 at gmail dot com
--- Comment #8 from megha <hegdemegha216 at gmail dot com> ---
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* [Bug tools/23786] Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174
2018-10-17 8:37 [Bug general/23786] New: Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174 wcventure at 126 dot com
` (7 preceding siblings ...)
2020-11-22 14:50 ` hegdemegha216 at gmail dot com
@ 2021-01-13 18:29 ` ittech.euh at gmail dot com
2021-01-13 19:09 ` mark at klomp dot org
9 siblings, 0 replies; 11+ messages in thread
From: ittech.euh at gmail dot com @ 2021-01-13 18:29 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=23786
EagleEye404 <ittech.euh at gmail dot com> changed:
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CC| |ittech.euh at gmail dot com
--- Comment #9 from EagleEye404 <ittech.euh at gmail dot com> ---
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* [Bug tools/23786] Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174
2018-10-17 8:37 [Bug general/23786] New: Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174 wcventure at 126 dot com
` (8 preceding siblings ...)
2021-01-13 18:29 ` ittech.euh at gmail dot com
@ 2021-01-13 19:09 ` mark at klomp dot org
9 siblings, 0 replies; 11+ messages in thread
From: mark at klomp dot org @ 2021-01-13 19:09 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=23786
Mark Wielaard <mark at klomp dot org> changed:
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----------------------------------------------------------------------------
CC|elfutils-devel at sourceware dot o |
|rg, |
|hegdemegha216 at gmail dot com, |
|ittech.euh at gmail dot com, |
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|scottswayer at gmail dot com |
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2018-10-17 8:37 [Bug general/23786] New: Divide-by-zero Problem in function arlib_add_symbols() in arlib.c in elfutils-0.174 wcventure at 126 dot com
2018-10-17 8:38 ` [Bug general/23786] " wcventure at 126 dot com
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