Ubuntu
ecryptfs-utils package

login crashed with SIGSEGV in __flockfile()

Bug #403011 reported by Martin Pitt on 2009-07-22

12

This bug affects 1 person

Affects		Status	Importance	Assigned to	Milestone
	ecryptfs-utils (Ubuntu)	Fix Released	Critical	James Westby

Bug Description

ecryptfs 77-0ubuntu1 introduces a segfault in the PAM module which causes login, sudo, etc. to crash.

ProblemType: Crash
Architecture: amd64
Date: Wed Jul 22 14:06:05 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /bin/login
Package: login 1:4.1.4.1-1ubuntu1
ProcCmdline: /bin/login --
ProcEnviron: PATH=(custom, no user)
ProcVersionSignature: Ubuntu 2.6.31-3.19-generic
SegvAnalysis:
Segfault happened at: 0x7f083f39cc11 <__flockfile+1>: mov 0x88(%rdi),%r10
PC (0x7f083f39cc11) ok
source "0x88(%rdi)" (0x00000088) not located in a known VMA region (needed readable region)!
destination "%r10" ok
SegvReason: reading NULL VMA
Signal: 11
SourcePackage: shadow
StacktraceTop:
__flockfile (stream=0x0) at ../nptl/sysdeps/pthread/flockfile.c:30
ecryptfs_fetch_private_mnt ()
pam_sm_authenticate ()
?? ()
?? ()
Title: login crashed with SIGSEGV in __flockfile()
Uname: Linux 2.6.31-3-generic x86_64
UserGroups:

Tags:

Related branches

lp:ubuntu/lucid/ecryptfs-utils

Revision history for this message

Martin Pitt (pitti) wrote on 2009-07-22:

#1

CoreDump.gz Edit (90.6 KiB, application/x-gzip)
Dependencies.txt Edit (601 bytes, text/plain; charset="utf-8")
Disassembly.txt Edit (994 bytes, text/plain; charset="utf-8")
ProcMaps.txt Edit (16.7 KiB, text/plain; charset="utf-8")
ProcStatus.txt Edit (713 bytes, text/plain; charset="utf-8")
Registers.txt Edit (969 bytes, text/plain; charset="utf-8")
Stacktrace.txt Edit (322 bytes, text/plain; charset="utf-8")
ThreadStacktrace.txt Edit (348 bytes, text/plain; charset="utf-8")

affects:	shadow (Ubuntu) → ecryptfs-utils (Ubuntu)
Changed in ecryptfs-utils (Ubuntu):
importance:	Undecided → Critical
tags:	added: regression-potential

Revision history for this message

Martin Pitt (pitti) wrote on 2009-07-22:

#2

#0 __flockfile (stream=0x0) at ../nptl/sysdeps/pthread/flockfile.c:30
30 ../nptl/sysdeps/pthread/flockfile.c: No such file or directory.
in ../nptl/sysdeps/pthread/flockfile.c
(gdb) bt
#0 __flockfile (stream=0x0) at ../nptl/sysdeps/pthread/flockfile.c:30
#1 0x00007f083d46380c in ecryptfs_fetch_private_mnt ()
   from /usr/lib/libecryptfs.so.0
#2 0x00007f083d682d38 in pam_sm_authenticate (pamh=0x1298460,
    flags=<value optimized out>, argc=1, argv=0x129f920) at pam_ecryptfs.c:135
#3 0x00007f083f8b9b70 in ?? () from /lib/libpam.so.0
#4 0x00007f083f8b9498 in pam_authenticate () from /lib/libpam.so.0
#5 0x00000000004033ca in ?? ()
#6 0x00007f083f362606 in __libc_start_main (
    main=0x402ce0 <getgrnam_r@plt+952>, argc=3, ubp_av=0x7fff5b81eda8,
    init=0x407f50 <getgrnam_r@plt+22056>, fini=<value optimized out>,
    rtld_fini=<value optimized out>, stack_end=0x7fff5b81ed98)
    at libc-start.c:220

Revision history for this message

Martin Pitt (pitti) wrote on 2009-07-22:

#3

bt full:

#0 __flockfile (stream=0x0) at ../nptl/sysdeps/pthread/flockfile.c:30
No locals.
#1 0x00007f083d46380c in ecryptfs_fetch_private_mnt ()
   from /usr/lib/libecryptfs.so.0
No symbol table info available.
#2 0x00007f083d682d38 in pam_sm_authenticate (pamh=0x1298460,
    flags=<value optimized out>, argc=1, argv=0x129f920) at pam_ecryptfs.c:135
        uid = 1000
        homedir = 0x12aebb2 "/home/martin"
        saved_uid = 1041103611
        username = 0x12985e0 "martin"
        passphrase = 0x0
        salt = "\0\0\0\0\0\0\0"
        salt_hex = ""\340Ɓ[\377\177\0\0\220\245)\1\0\0\0
        private_mnt = <value optimized out>
        tmp_pid = <value optimized out>
        rc = <value optimized out>
        version = 32520
        __FUNCTION__ = "pam_sm_authenticate"
#3 0x00007f083f8b9b70 in ?? () from /lib/libpam.so.0
No symbol table info available.
#4 0x00007f083f8b9498 in pam_authenticate () from /lib/libpam.so.0
No symbol table info available.
#5 0x00000000004033ca in ?? ()
#6 0x00007f083f362606 in __libc_start_main (
    main=0x402ce0 <getgrnam_r@plt+952>, argc=3, ubp_av=0x7fff5b81eda8,
    init=0x407f50 <getgrnam_r@plt+22056>, fini=<value optimized out>,
    rtld_fini=<value optimized out>, stack_end=0x7fff5b81ed98)
    at libc-start.c:220
        result = <value optimized out>
        unwind_buf = {cancel_jmp_buf = {{jmp_buf = {4226896,
                -5134769356078350032, 4204864, 140734728629664, 0, 0,
                5134971614242505008, 5092968738607694128},
              mask_was_saved = 0}}, priv = {pad = {0x0, 0x0, 0x3, 0x402ce0},
            data = {prev = 0x0, cleanup = 0x0, canceltype = 3}}}
        not_first_call = <value optimized out>

visibility:

private → public

Revision history for this message

Matt Zimmerman (mdz) wrote on 2009-07-22:

#4

proposed patch from james-w Edit (862 bytes, text/plain)

Changed in ecryptfs-utils (Ubuntu):
status:	New → Triaged
assignee:	nobody → James Westby (james-w)

Revision history for this message

Launchpad Janitor (janitor) wrote on 2009-07-22:

#5

This bug was fixed in the package ecryptfs-utils - 77-0ubuntu2

---------------
ecryptfs-utils (77-0ubuntu2) karmic; urgency=low

* flockfile the filehandle after checking that we were able to successfully
open if (LP: #403011)

-- James Westby <email address hidden> Wed, 22 Jul 2009 13:35:11 +0100

Changed in ecryptfs-utils (Ubuntu):
status:	Triaged → Fix Released

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