* [Bug general/25831] New: Assertion failure in eu-objdump
@ 2020-04-16 6:28 nguyenmanhdung1710 at gmail dot com
2020-04-16 13:54 ` [Bug general/25831] " mark at klomp dot org
2020-04-21 20:29 ` mark at klomp dot org
0 siblings, 2 replies; 3+ messages in thread
From: nguyenmanhdung1710 at gmail dot com @ 2020-04-16 6:28 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=25831
Bug ID: 25831
Summary: Assertion failure in eu-objdump
Product: elfutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: general
Assignee: unassigned at sourceware dot org
Reporter: nguyenmanhdung1710 at gmail dot com
CC: elfutils-devel at sourceware dot org
Target Milestone: ---
Created attachment 12465
--> https://sourceware.org/bugzilla/attachment.cgi?id=12465&action=edit
PoC for an assertion failure
Hi,
An assertion failure was discovered in the latest commit 1a9fe4b of elfutils
0.179, as demonstrated by eu-objdump via a crafted file.
To reproduce: eu-objdump -d PoC
Valgrind says:
objdump: ../../libcpu/i386_disasm.c:449: x86_64_disasm: Assertion
`correct_prefix == 0 || (prefixes & correct_prefix) != 0' failed.
==6901==
==6901== Process terminating with default action of signal 6 (SIGABRT)
==6901== at 0x56F5428: raise (raise.c:54)
==6901== by 0x56F7029: abort (abort.c:89)
==6901== by 0x56EDBD6: __assert_fail_base (assert.c:92)
==6901== by 0x56EDC81: __assert_fail (assert.c:101)
==6901== by 0x47BF64: x86_64_disasm (i386_disasm.c:448)
==6901== by 0x4E4ECE0: disasm_cb (disasm_cb.c:178)
==6901== by 0x407017: show_disasm (objdump.c:737)
==6901== by 0x407017: handle_elf (objdump.c:783)
==6901== by 0x4029BD: process_file (objdump.c:251)
==6901== by 0x4029BD: main (objdump.c:164)
Thanks,
Manh Dung
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* [Bug general/25831] Assertion failure in eu-objdump
2020-04-16 6:28 [Bug general/25831] New: Assertion failure in eu-objdump nguyenmanhdung1710 at gmail dot com
@ 2020-04-16 13:54 ` mark at klomp dot org
2020-04-21 20:29 ` mark at klomp dot org
1 sibling, 0 replies; 3+ messages in thread
From: mark at klomp dot org @ 2020-04-16 13:54 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=25831
Mark Wielaard <mark at klomp dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2020-04-16
CC| |mark at klomp dot org
Ever confirmed|0 |1
Status|UNCONFIRMED |ASSIGNED
--- Comment #1 from Mark Wielaard <mark at klomp dot org> ---
It is bad code and so correct to reject it. But we can reject it without
asserting and just printing "(bad)". Proposed patch:
https://sourceware.org/pipermail/elfutils-devel/2020q2/002619.html
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* [Bug general/25831] Assertion failure in eu-objdump
2020-04-16 6:28 [Bug general/25831] New: Assertion failure in eu-objdump nguyenmanhdung1710 at gmail dot com
2020-04-16 13:54 ` [Bug general/25831] " mark at klomp dot org
@ 2020-04-21 20:29 ` mark at klomp dot org
1 sibling, 0 replies; 3+ messages in thread
From: mark at klomp dot org @ 2020-04-21 20:29 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=25831
Mark Wielaard <mark at klomp dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #2 from Mark Wielaard <mark at klomp dot org> ---
Pushed the fix:
commit 25d40a626d36c140c8bb309f410f25af2836ec9b
Author: Mark Wielaard <mark@klomp.org>
Date: Thu Apr 16 15:41:57 2020 +0200
libcpu: Replace assert with goto invalid_op for bad prefix.
https://sourceware.org/bugzilla/show_bug.cgi?id=25831
Signed-off-by: Mark Wielaard <mark@klomp.org>
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2020-04-16 13:54 ` [Bug general/25831] " mark at klomp dot org
2020-04-21 20:29 ` mark at klomp dot org
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