* [Bug libdw/28677] New: Bad dynamic entry conversion in dwfl_link_map_report
@ 2021-12-09 20:14 mark at klomp dot org
2021-12-09 20:28 ` [Bug libdw/28677] " mark at klomp dot org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: mark at klomp dot org @ 2021-12-09 20:14 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=28677
Bug ID: 28677
Summary: Bad dynamic entry conversion in dwfl_link_map_report
Product: elfutils
Version: unspecified
Status: NEW
Severity: normal
Priority: P2
Component: libdw
Assignee: unassigned at sourceware dot org
Reporter: mark at klomp dot org
CC: elfutils-devel at sourceware dot org
Target Milestone: ---
Created attachment 13841
--> https://sourceware.org/bugzilla/attachment.cgi?id=13841&action=edit
Corrupt core file
Reproducer from Bug 28666
$ valgrind -q eu-stack --core ./poc2
==500881== Invalid read of size 8
==500881== at 0x4851268: __GI_memmove (vg_replace_strmem.c:1271)
==500881== by 0x48994CB: elf32_xlatetom (in
/usr/lib/aarch64-linux-gnu/libelf-0.183.so)
==500881== by 0x49232D3: ??? (in /usr/lib/aarch64-linux-gnu/libdw-0.183.so)
==500881== by 0x4924977: dwfl_core_file_report (in
/usr/lib/aarch64-linux-gnu/libdw-0.183.so)
==500881== by 0x10AAB7: ??? (in /usr/bin/eu-stack)
==500881== by 0x4C2ABAF: group_parse (argp-parse.c:257)
==500881== by 0x4C2ABAF: parser_finalize (argp-parse.c:604)
==500881== by 0x4C2ABAF: argp_parse (argp-parse.c:922)
==500881== by 0x10A273: ??? (in /usr/bin/eu-stack)
==500881== by 0x4B6C217: (below main) (libc-start.c:308)
==500881== Address 0x4034000 is 0 bytes after the brk data segment limit
0x4034000
==500881==
==500881== Invalid read of size 8
==500881== at 0x4851278: __GI_memmove (vg_replace_strmem.c:1271)
==500881== by 0x48994CB: elf32_xlatetom (in
/usr/lib/aarch64-linux-gnu/libelf-0.183.so)
==500881== by 0x49232D3: ??? (in /usr/lib/aarch64-linux-gnu/libdw-0.183.so)
==500881== by 0x4924977: dwfl_core_file_report (in
/usr/lib/aarch64-linux-gnu/libdw-0.183.so)
==500881== by 0x10AAB7: ??? (in /usr/bin/eu-stack)
==500881== by 0x4C2ABAF: group_parse (argp-parse.c:257)
==500881== by 0x4C2ABAF: parser_finalize (argp-parse.c:604)
==500881== by 0x4C2ABAF: argp_parse (argp-parse.c:922)
==500881== by 0x10A273: ??? (in /usr/bin/eu-stack)
==500881== by 0x4B6C217: (below main) (libc-start.c:308)
==500881== Address 0x4034008 is 8 bytes after the brk data segment limit
0x4034000
==500881==
==500881== Invalid read of size 8
==500881== at 0x4851280: __GI_memmove (vg_replace_strmem.c:1271)
==500881== by 0x48994CB: elf32_xlatetom (in
/usr/lib/aarch64-linux-gnu/libelf-0.183.so)
==500881== by 0x49232D3: ??? (in /usr/lib/aarch64-linux-gnu/libdw-0.183.so)
==500881== by 0x4924977: dwfl_core_file_report (in
/usr/lib/aarch64-linux-gnu/libdw-0.183.so)
==500881== by 0x10AAB7: ??? (in /usr/bin/eu-stack)
==500881== by 0x4C2ABAF: group_parse (argp-parse.c:257)
==500881== by 0x4C2ABAF: parser_finalize (argp-parse.c:604)
==500881== by 0x4C2ABAF: argp_parse (argp-parse.c:922)
==500881== by 0x10A273: ??? (in /usr/bin/eu-stack)
==500881== by 0x4B6C217: (below main) (libc-start.c:308)
==500881== Address 0x4034010 is 16 bytes after the brk data segment limit
0x4034000
==500881==
==500881== Invalid read of size 8
==500881== at 0x4851288: __GI_memmove (vg_replace_strmem.c:1271)
==500881== by 0x48994CB: elf32_xlatetom (in
/usr/lib/aarch64-linux-gnu/libelf-0.183.so)
==500881== by 0x49232D3: ??? (in /usr/lib/aarch64-linux-gnu/libdw-0.183.so)
==500881== by 0x4924977: dwfl_core_file_report (in
/usr/lib/aarch64-linux-gnu/libdw-0.183.so)
==500881== by 0x10AAB7: ??? (in /usr/bin/eu-stack)
==500881== by 0x4C2ABAF: group_parse (argp-parse.c:257)
==500881== by 0x4C2ABAF: parser_finalize (argp-parse.c:604)
==500881== by 0x4C2ABAF: argp_parse (argp-parse.c:922)
==500881== by 0x10A273: ??? (in /usr/bin/eu-stack)
==500881== by 0x4B6C217: (below main) (libc-start.c:308)
==500881== Address 0x4034018 is 24 bytes after the brk data segment limit
0x4034000
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* [Bug libdw/28677] Bad dynamic entry conversion in dwfl_link_map_report
2021-12-09 20:14 [Bug libdw/28677] New: Bad dynamic entry conversion in dwfl_link_map_report mark at klomp dot org
@ 2021-12-09 20:28 ` mark at klomp dot org
2021-12-09 21:27 ` evvers at ya dot ru
2021-12-10 10:14 ` mark at klomp dot org
2 siblings, 0 replies; 4+ messages in thread
From: mark at klomp dot org @ 2021-12-09 20:28 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=28677
Mark Wielaard <mark at klomp dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at sourceware dot org |mark at klomp dot org
--- Comment #1 from Mark Wielaard <mark at klomp dot org> ---
Proposed patch:
https://sourceware.org/pipermail/elfutils-devel/2021q4/004507.html
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* [Bug libdw/28677] Bad dynamic entry conversion in dwfl_link_map_report
2021-12-09 20:14 [Bug libdw/28677] New: Bad dynamic entry conversion in dwfl_link_map_report mark at klomp dot org
2021-12-09 20:28 ` [Bug libdw/28677] " mark at klomp dot org
@ 2021-12-09 21:27 ` evvers at ya dot ru
2021-12-10 10:14 ` mark at klomp dot org
2 siblings, 0 replies; 4+ messages in thread
From: evvers at ya dot ru @ 2021-12-09 21:27 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=28677
Evgeny Vereshchagin <evvers at ya dot ru> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |evvers at ya dot ru
--- Comment #2 from Evgeny Vereshchagin <evvers at ya dot ru> ---
(In reply to Mark Wielaard from comment #1)
> Proposed patch:
> https://sourceware.org/pipermail/elfutils-devel/2021q4/004507.html
With that patch applied I can no longer reproduce the issue. Thanks!
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* [Bug libdw/28677] Bad dynamic entry conversion in dwfl_link_map_report
2021-12-09 20:14 [Bug libdw/28677] New: Bad dynamic entry conversion in dwfl_link_map_report mark at klomp dot org
2021-12-09 20:28 ` [Bug libdw/28677] " mark at klomp dot org
2021-12-09 21:27 ` evvers at ya dot ru
@ 2021-12-10 10:14 ` mark at klomp dot org
2 siblings, 0 replies; 4+ messages in thread
From: mark at klomp dot org @ 2021-12-10 10:14 UTC (permalink / raw)
To: elfutils-devel
https://sourceware.org/bugzilla/show_bug.cgi?id=28677
Mark Wielaard <mark at klomp dot org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|ASSIGNED |RESOLVED
--- Comment #3 from Mark Wielaard <mark at klomp dot org> ---
Thanks for testing. Applied as:
commit 78ecba0926216e0ad90b71f789636d1e0a9777ca
Author: Mark Wielaard <mark@klomp.org>
Date: Thu Dec 9 21:24:18 2021 +0100
libdwfl: Don't try to convert too many dyns in dwfl_link_map_report
When trying to read (corrupt) dynamic entries from a core file we only
want to read and convert the entries we could read. Also make sure we
don't try to allocate too bug a buffer.
Signed-off-by: Mark Wielaard <mark@klomp.org>
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2021-12-09 20:14 [Bug libdw/28677] New: Bad dynamic entry conversion in dwfl_link_map_report mark at klomp dot org
2021-12-09 20:28 ` [Bug libdw/28677] " mark at klomp dot org
2021-12-09 21:27 ` evvers at ya dot ru
2021-12-10 10:14 ` mark at klomp dot org
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