Bug 589920

Summary:

bad dwarf cfi data in yp-tools binary

Product:

Red Hat Enterprise Linux 6

Reporter:

Mark Wielaard <mjw>

Component:

yp-tools

Assignee:

Karel Klíč <kklic>

Status:

CLOSED CURRENTRELEASE

QA Contact:

Ales Zelinka <azelinka>

Severity:

medium

Docs Contact:

Priority:

low

Version:

6.0

CC:

azelinka, rvokal

Target Milestone:

Target Release:

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Hardware:

All

OS:

Linux

Whiteboard:

Fixed In Version:

yp-tools-2.9-10.el6

Doc Type:

Bug Fix

Doc Text:

Story Points:

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Clone Of:

Environment:

Last Closed:

2010-11-10 21:59:53 UTC

Type:

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Regression:

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Mount Type:

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Documentation:

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CRM:

Verified Versions:

Category:

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oVirt Team:

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RHEL 7.3 requirements from Atomic Host:

Cloudforms Team:

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Target Upstream Version:

Embargoed:

Attachments:

Description	Flags
python script to check for bad cfi in a binary	none

Description Mark Wielaard 2010-05-07 10:05:58 UTC

Description of problem:

An old version of gcc generated bad dwarf cfi expressions. This would not impact the functioning of the package itself, but might make debugging the binary with gdb, or tracing with systemtap less practical. This isn't a very high priority. But if the package can be rebuild with a current toolchain, gcc-4.4.3-19.el6 or later, that would solve this issue. Background information: http://gcc.gnu.org/ml/gcc-patches/2010-04/msg01422.html This only affects a very small number of packages (and only the i686 binaries).

Version-Release number of selected component (if applicable):

yp-tools-2.9-9.el6.i686 (/usr/bin/yppasswd, /usr/bin/ypchfn, /usr/bin/ypchsh)

The attached check_cfi.py script (thanks to Petr Machata) can be used to check the output of readelf --debug-dump=frames to see whether the faulty dwarf cfi expressions are present in the binary. There should be no output, currently the output is:

-rwxr-xr-x. 3 root root 19K Feb 26 16:28 /usr/bin/yppasswd
readelf --debug-dump=frames /usr/bin/yppasswd | tail -n +3 | python check_cfi.py
['00000000', '00000014', '00000000', 'CIE']
   DW_CFA_def_cfa: r4 (esp) ofs 4
   DW_CFA_offset: r8 (eip) at cfa-4
   DW_CFA_nop
   DW_CFA_nop
['00000144', '00000044', '00000148', 'FDE', 'cie=00000000', 'pc=08049880..0804b1
49']
   DW_CFA_advance_loc: 4 to 08049884
>  DW_CFA_def_cfa: r1 (ecx) ofs 0
   DW_CFA_advance_loc: 9 to 0804988d
   DW_CFA_expression: r5 (ebp) (DW_OP_breg5: 0)
   DW_CFA_advance_loc: 6 to 08049893
   DW_CFA_expression: r7 (edi) (DW_OP_breg5: -4)
   DW_CFA_advance_loc: 3 to 08049896
>  DW_CFA_def_cfa_expression (DW_OP_breg5: -16; DW_OP_deref)
   DW_CFA_advance_loc: 10 to 080498a0
   DW_CFA_expression: r3 (ebx) (DW_OP_breg5: -12)
   DW_CFA_expression: r6 (esi) (DW_OP_breg5: -8)
   DW_CFA_advance_loc2: 521 to 08049aa9
   DW_CFA_remember_state
>  DW_CFA_def_cfa_register: r1 (ecx)
   DW_CFA_advance_loc: 1 to 08049aaa
   DW_CFA_restore: r3 (ebx)
   DW_CFA_advance_loc: 1 to 08049aab
   DW_CFA_restore: r6 (esi)
   DW_CFA_advance_loc: 1 to 08049aac
   DW_CFA_restore: r7 (edi)
   DW_CFA_advance_loc: 1 to 08049aad
   DW_CFA_restore: r5 (ebp)
   DW_CFA_advance_loc: 3 to 08049ab0
   DW_CFA_def_cfa: r4 (esp) ofs 4
   DW_CFA_advance_loc: 8 to 08049ab8
   DW_CFA_restore_state
   DW_CFA_nop
   DW_CFA_nop
error in instr #17, DW_CFA_def_cfa_register


readelf --debug-dump=frames /usr/bin/ypchfn | tail -n +3 | python check_cfi.py
['00000000', '00000014', '00000000', 'CIE']
   DW_CFA_def_cfa: r4 (esp) ofs 4
   DW_CFA_offset: r8 (eip) at cfa-4
   DW_CFA_nop
   DW_CFA_nop
['00000144', '00000044', '00000148', 'FDE', 'cie=00000000', 'pc=08049880..0804b149']
   DW_CFA_advance_loc: 4 to 08049884
>  DW_CFA_def_cfa: r1 (ecx) ofs 0
   DW_CFA_advance_loc: 9 to 0804988d
   DW_CFA_expression: r5 (ebp) (DW_OP_breg5: 0)
   DW_CFA_advance_loc: 6 to 08049893
   DW_CFA_expression: r7 (edi) (DW_OP_breg5: -4)
   DW_CFA_advance_loc: 3 to 08049896
>  DW_CFA_def_cfa_expression (DW_OP_breg5: -16; DW_OP_deref)
   DW_CFA_advance_loc: 10 to 080498a0
   DW_CFA_expression: r3 (ebx) (DW_OP_breg5: -12)
   DW_CFA_expression: r6 (esi) (DW_OP_breg5: -8)
   DW_CFA_advance_loc2: 521 to 08049aa9
   DW_CFA_remember_state
>  DW_CFA_def_cfa_register: r1 (ecx)
   DW_CFA_advance_loc: 1 to 08049aaa
   DW_CFA_restore: r3 (ebx)
   DW_CFA_advance_loc: 1 to 08049aab
   DW_CFA_restore: r6 (esi)
   DW_CFA_advance_loc: 1 to 08049aac
   DW_CFA_restore: r7 (edi)
   DW_CFA_advance_loc: 1 to 08049aad
   DW_CFA_restore: r5 (ebp)
   DW_CFA_advance_loc: 3 to 08049ab0
   DW_CFA_def_cfa: r4 (esp) ofs 4
   DW_CFA_advance_loc: 8 to 08049ab8
   DW_CFA_restore_state
   DW_CFA_nop
   DW_CFA_nop
error in instr #17, DW_CFA_def_cfa_register


readelf --debug-dump=frames /usr/bin/ypchsh | tail -n +3 | python check_cfi.py
['00000000', '00000014', '00000000', 'CIE']
   DW_CFA_def_cfa: r4 (esp) ofs 4
   DW_CFA_offset: r8 (eip) at cfa-4
   DW_CFA_nop
   DW_CFA_nop
['00000144', '00000044', '00000148', 'FDE', 'cie=00000000', 'pc=08049880..0804b149']
   DW_CFA_advance_loc: 4 to 08049884
>  DW_CFA_def_cfa: r1 (ecx) ofs 0
   DW_CFA_advance_loc: 9 to 0804988d
   DW_CFA_expression: r5 (ebp) (DW_OP_breg5: 0)
   DW_CFA_advance_loc: 6 to 08049893
   DW_CFA_expression: r7 (edi) (DW_OP_breg5: -4)
   DW_CFA_advance_loc: 3 to 08049896
>  DW_CFA_def_cfa_expression (DW_OP_breg5: -16; DW_OP_deref)
   DW_CFA_advance_loc: 10 to 080498a0
   DW_CFA_expression: r3 (ebx) (DW_OP_breg5: -12)
   DW_CFA_expression: r6 (esi) (DW_OP_breg5: -8)
   DW_CFA_advance_loc2: 521 to 08049aa9
   DW_CFA_remember_state
>  DW_CFA_def_cfa_register: r1 (ecx)
   DW_CFA_advance_loc: 1 to 08049aaa
   DW_CFA_restore: r3 (ebx)
   DW_CFA_advance_loc: 1 to 08049aab
   DW_CFA_restore: r6 (esi)
   DW_CFA_advance_loc: 1 to 08049aac
   DW_CFA_restore: r7 (edi)
   DW_CFA_advance_loc: 1 to 08049aad
   DW_CFA_restore: r5 (ebp)
   DW_CFA_advance_loc: 3 to 08049ab0
   DW_CFA_def_cfa: r4 (esp) ofs 4
   DW_CFA_advance_loc: 8 to 08049ab8
   DW_CFA_restore_state
   DW_CFA_nop
   DW_CFA_nop
error in instr #17, DW_CFA_def_cfa_register

Comment 2 Mark Wielaard 2010-05-07 10:28:25 UTC

Created attachment 412296 [details]
python script to check for bad cfi in a binary

Comment 3 RHEL Program Management 2010-05-07 11:31:00 UTC

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
inclusion.

Comment 6 releng-rhel@redhat.com 2010-11-10 21:59:53 UTC

Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.