* bug#24138: SIGSEGV of useradd (from shadow package)
@ 2016-08-03 6:59 Tomáš Čech
2016-08-03 16:56 ` Ludovic Courtès
0 siblings, 1 reply; 6+ messages in thread
From: Tomáš Čech @ 2016-08-03 6:59 UTC (permalink / raw)
To: 24138
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It seems to be easy to crash useradd (from shadow package).
# ls -l $(which useradd)
lrwxrwxrwx 4 root guixbuild 69 Jan 1 1970 /root/.guix-profile/sbin/useradd -> /gnu/store/ylnc73apl1irl0s613rxjl445x2zx8a5-shadow-4.2.1/sbin/useradd
# useradd test
Neoprávněný přístup do paměti (SIGSEGV) (core dumped [obraz paměti uložen])
(139) # gdb $(which useradd) core
GNU gdb (GDB) 7.11.1
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License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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and "show warranty" for details.
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Reading symbols from /root/.guix-profile/sbin/useradd...(no debugging symbols found)...done.
[New LWP 1603]
warning: Could not load shared library symbols for linux-vdso.so.1.
Do you need "set solib-search-path" or "set sysroot"?
Core was generated by `useradd test'.
Program terminated with signal SIGSEGV, Segmentation fault.
#0 0x00007f457ee6503c in call_init.part () from /gnu/store/8m00x5x8ykmar27s9248cmhnkdb2n54a-glibc-2.22/lib/ld-linux-x86-64.so.2
(gdb) bt
#0 0x00007f457ee6503c in call_init.part () from /gnu/store/8m00x5x8ykmar27s9248cmhnkdb2n54a-glibc-2.22/lib/ld-linux-x86-64.so.2
#1 0x00007f457ee65205 in _dl_init () from /gnu/store/8m00x5x8ykmar27s9248cmhnkdb2n54a-glibc-2.22/lib/ld-linux-x86-64.so.2
#2 0x00007f457ee696a0 in dl_open_worker () from /gnu/store/8m00x5x8ykmar27s9248cmhnkdb2n54a-glibc-2.22/lib/ld-linux-x86-64.so.2
#3 0x00007f457ee64f34 in _dl_catch_error () from /gnu/store/8m00x5x8ykmar27s9248cmhnkdb2n54a-glibc-2.22/lib/ld-linux-x86-64.so.2
#4 0x00007f457ee68d33 in _dl_open () from /gnu/store/8m00x5x8ykmar27s9248cmhnkdb2n54a-glibc-2.22/lib/ld-linux-x86-64.so.2
#5 0x00007f457e841fb9 in dlopen_doit () from /gnu/store/8m00x5x8ykmar27s9248cmhnkdb2n54a-glibc-2.22/lib/libdl.so.2
#6 0x00007f457ee64f34 in _dl_catch_error () from /gnu/store/8m00x5x8ykmar27s9248cmhnkdb2n54a-glibc-2.22/lib/ld-linux-x86-64.so.2
#7 0x00007f457e842589 in _dlerror_run () from /gnu/store/8m00x5x8ykmar27s9248cmhnkdb2n54a-glibc-2.22/lib/libdl.so.2
#8 0x00007f457e842051 in dlopen@@GLIBC_2.2.5 () from /gnu/store/8m00x5x8ykmar27s9248cmhnkdb2n54a-glibc-2.22/lib/libdl.so.2
#9 0x00007f457ea49e8d in _pam_load_module () from /gnu/store/2xmwkq2ycwk89xlxnvib5wnjaacfy0rg-linux-pam-1.2.1/lib/libpam.so.0
#10 0x00007f457ea4a4f9 in _pam_add_handler () from /gnu/store/2xmwkq2ycwk89xlxnvib5wnjaacfy0rg-linux-pam-1.2.1/lib/libpam.so.0
#11 0x00007f457ea4ad90 in _pam_parse_conf_file () from /gnu/store/2xmwkq2ycwk89xlxnvib5wnjaacfy0rg-linux-pam-1.2.1/lib/libpam.so.0
#12 0x00007f457ea4b395 in _pam_init_handlers () from /gnu/store/2xmwkq2ycwk89xlxnvib5wnjaacfy0rg-linux-pam-1.2.1/lib/libpam.so.0
#13 0x00007f457ea4cae1 in pam_start () from /gnu/store/2xmwkq2ycwk89xlxnvib5wnjaacfy0rg-linux-pam-1.2.1/lib/libpam.so.0
#14 0x0000000000403351 in main ()
Interesting information about module causing it would be in stackframe
#9 but there are no debugging information available. Adding debug
`output' to linux-pam would diverge me from GuixSD.
from strace:
read(3, "account required pam_deny.so \nau"..., 4096) = 223
open("/gnu/store/2xmwkq2ycwk89xlxnvib5wnjaacfy0rg-linux-pam-1.2.1/lib/security/pam_deny.so", O_RDONLY|O_CLOEXEC) = 5
read(5, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340\6\0\0\0\0\0\0"..., 832) = 832
fstat(5, {st_mode=S_IFREG|0555, st_size=6728, ...}) = 0
mmap(NULL, 2100200, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 5, 0) = 0x7fb8b447c000
mprotect(0x7fb8b447d000, 2093056, PROT_NONE) = 0
mmap(0x7fb8b467c000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 5, 0) = 0x7fb8b467c000
close(5) = 0
--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x7fb8b3d1bda8} ---
+++ killed by SIGSEGV (core dumped) +++
# cat /etc/pam.d/useradd
account required pam_unix.so
auth sufficient pam_rootok.so
password required pam_unix.so
session required /gnu/store/4mmn5y6syzv7wwz1y6bl1ab4g0yvkdq1-elogind-219.14/lib/security/pam_elogind.so
session required pam_unix.so
# cat /etc/pam.d/other
account required pam_deny.so
auth required pam_deny.so
password required pam_deny.so
session required /gnu/store/4mmn5y6syzv7wwz1y6bl1ab4g0yvkdq1-elogind-219.14/lib/security/pam_elogind.so
session required pam_deny.so
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^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#24138: SIGSEGV of useradd (from shadow package)
2016-08-03 6:59 bug#24138: SIGSEGV of useradd (from shadow package) Tomáš Čech
@ 2016-08-03 16:56 ` Ludovic Courtès
2016-08-03 23:31 ` Tomáš Čech
0 siblings, 1 reply; 6+ messages in thread
From: Ludovic Courtès @ 2016-08-03 16:56 UTC (permalink / raw)
To: Tomáš Čech; +Cc: 24138
Hello!
Tomáš Čech <sleep_walker@gnu.org> skribis:
> It seems to be easy to crash useradd (from shadow package).
Is it on GuixSD?
> from strace:
>
> read(3, "account required pam_deny.so \nau"..., 4096) = 223
> open("/gnu/store/2xmwkq2ycwk89xlxnvib5wnjaacfy0rg-linux-pam-1.2.1/lib/security/pam_deny.so", O_RDONLY|O_CLOEXEC) = 5
> read(5, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340\6\0\0\0\0\0\0"..., 832) = 832
> fstat(5, {st_mode=S_IFREG|0555, st_size=6728, ...}) = 0
> mmap(NULL, 2100200, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 5, 0) = 0x7fb8b447c000
> mprotect(0x7fb8b447d000, 2093056, PROT_NONE) = 0
> mmap(0x7fb8b467c000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 5, 0) = 0x7fb8b467c000
> close(5) = 0
> --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x7fb8b3d1bda8} ---
Could you check in the ‘strace’ output whether PAM modules build with
another libc are being loaded?
Thanks for your report!
Ludo’.
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#24138: SIGSEGV of useradd (from shadow package)
2016-08-03 16:56 ` Ludovic Courtès
@ 2016-08-03 23:31 ` Tomáš Čech
2016-09-09 14:29 ` Ludovic Courtès
0 siblings, 1 reply; 6+ messages in thread
From: Tomáš Čech @ 2016-08-03 23:31 UTC (permalink / raw)
To: Ludovic Courtès; +Cc: 24138
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On Wed, Aug 03, 2016 at 06:56:19PM +0200, Ludovic Courtès wrote:
>Hello!
>
>Tomáš Čech <sleep_walker@gnu.org> skribis:
>
>> It seems to be easy to crash useradd (from shadow package).
>
>Is it on GuixSD?
Yes. \o/
>> from strace:
>>
>> read(3, "account required pam_deny.so \nau"..., 4096) = 223
>> open("/gnu/store/2xmwkq2ycwk89xlxnvib5wnjaacfy0rg-linux-pam-1.2.1/lib/security/pam_deny.so", O_RDONLY|O_CLOEXEC) = 5
>> read(5, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\340\6\0\0\0\0\0\0"..., 832) = 832
>> fstat(5, {st_mode=S_IFREG|0555, st_size=6728, ...}) = 0
>> mmap(NULL, 2100200, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 5, 0) = 0x7fb8b447c000
>> mprotect(0x7fb8b447d000, 2093056, PROT_NONE) = 0
>> mmap(0x7fb8b467c000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 5, 0) = 0x7fb8b467c000
>> close(5) = 0
>> --- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x7fb8b3d1bda8} ---
>
>Could you check in the ‘strace’ output whether PAM modules build with
>another libc are being loaded?
It doesn't seem to be that case:
# grep linux-pam ~/useradd.strace | grep -v ENOENT
19555 open("/gnu/store/2xmwkq2ycwk89xlxnvib5wnjaacfy0rg-linux-pam-1.2.1/lib/libpam_misc.so.0", O_RDONLY|O_CLOEXEC) = 3
19555 open("/gnu/store/2xmwkq2ycwk89xlxnvib5wnjaacfy0rg-linux-pam-1.2.1/lib/libpam.so.0", O_RDONLY|O_CLOEXEC) = 3
19555 open("/gnu/store/2xmwkq2ycwk89xlxnvib5wnjaacfy0rg-linux-pam-1.2.1/lib/security/pam_unix.so", O_RDONLY|O_CLOEXEC) = 4
19555 open("/gnu/store/2xmwkq2ycwk89xlxnvib5wnjaacfy0rg-linux-pam-1.2.1/lib/security/pam_rootok.so", O_RDONLY|O_CLOEXEC) = 4
19555 stat("/gnu/store/m4xna3zq2il5an61wxbmfv82ndvz70f6-linux-pam-1.2.1/lib", {st_mode=S_IFDIR|0555, st_size=4096, ...}) = 0
19555 open("/gnu/store/2xmwkq2ycwk89xlxnvib5wnjaacfy0rg-linux-pam-1.2.1/lib/security/pam_deny.so", O_RDONLY|O_CLOEXEC) = 5
On the other hand it seems to load part of the libraries from 2.22,
part from 2.23 and that is not healthy.
# grep glibc ~/useradd.strace | grep -v ENOENT
19555 open("/gnu/store/8m00x5x8ykmar27s9248cmhnkdb2n54a-glibc-2.22/lib/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3
19555 open("/gnu/store/8m00x5x8ykmar27s9248cmhnkdb2n54a-glibc-2.22/lib/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
19555 open("/gnu/store/8m00x5x8ykmar27s9248cmhnkdb2n54a-glibc-2.22/share/locale/locale.alias", O_RDONLY|O_CLOEXEC) = 3
19555 open("/gnu/store/8m00x5x8ykmar27s9248cmhnkdb2n54a-glibc-2.22/lib/libnss_compat.so.2", O_RDONLY|O_CLOEXEC) = 3
19555 open("/gnu/store/8m00x5x8ykmar27s9248cmhnkdb2n54a-glibc-2.22/lib/libnsl.so.1", O_RDONLY|O_CLOEXEC) = 3
19555 open("/gnu/store/8m00x5x8ykmar27s9248cmhnkdb2n54a-glibc-2.22/lib/libnss_nis.so.2", O_RDONLY|O_CLOEXEC) = 3
19555 open("/gnu/store/8m00x5x8ykmar27s9248cmhnkdb2n54a-glibc-2.22/lib/libnss_files.so.2", O_RDONLY|O_CLOEXEC) = 3
19555 open("/gnu/store/8m00x5x8ykmar27s9248cmhnkdb2n54a-glibc-2.22/lib/libcrypt.so.1", O_RDONLY|O_CLOEXEC) = 4
19555 stat("/gnu/store/m9vxvhdj691bq1f85lpflvnhcvrdilih-glibc-2.23/lib", {st_mode=S_IFDIR|0555, st_size=4096, ...}) = 0
19555 open("/gnu/store/m9vxvhdj691bq1f85lpflvnhcvrdilih-glibc-2.23/lib/libm.so.6", O_RDONLY|O_CLOEXEC) = 4
19555 open("/gnu/store/m9vxvhdj691bq1f85lpflvnhcvrdilih-glibc-2.23/lib/librt.so.1", O_RDONLY|O_CLOEXEC) = 4
19555 open("/gnu/store/m9vxvhdj691bq1f85lpflvnhcvrdilih-glibc-2.23/lib/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 4
It seems to be more serious than I thought:
# login
Neoprávněný přístup do paměti (SIGSEGV) (core dumped [obraz paměti uložen])
S_W
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^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#24138: SIGSEGV of useradd (from shadow package)
2016-08-03 23:31 ` Tomáš Čech
@ 2016-09-09 14:29 ` Ludovic Courtès
2017-01-31 22:25 ` Ludovic Courtès
0 siblings, 1 reply; 6+ messages in thread
From: Ludovic Courtès @ 2016-09-09 14:29 UTC (permalink / raw)
To: Tomáš Čech; +Cc: 24138
Hi,
Tomáš Čech <sleep_walker@gnu.org> skribis:
> On the other hand it seems to load part of the libraries from 2.22,
> part from 2.23 and that is not healthy.
Indeed, this cannot work. Do you still have this problem? Do you know
why both libc versions were being used (LD_LIBRARY_PATH or some such?)?
TIA,
Ludo’.
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#24138: SIGSEGV of useradd (from shadow package)
2016-09-09 14:29 ` Ludovic Courtès
@ 2017-01-31 22:25 ` Ludovic Courtès
2017-02-04 14:42 ` Tomáš Čech
0 siblings, 1 reply; 6+ messages in thread
From: Ludovic Courtès @ 2017-01-31 22:25 UTC (permalink / raw)
To: Tomáš Čech; +Cc: 24138
Hi Tomáš,
Any updates on this bug, or should we close it?
https://bugs.gnu.org/24138
Thanks in advance! :-)
Ludo’.
ludo@gnu.org (Ludovic Courtès) skribis:
> Hi,
>
> Tomáš Čech <sleep_walker@gnu.org> skribis:
>
>> On the other hand it seems to load part of the libraries from 2.22,
>> part from 2.23 and that is not healthy.
>
> Indeed, this cannot work. Do you still have this problem? Do you know
> why both libc versions were being used (LD_LIBRARY_PATH or some such?)?
>
> TIA,
> Ludo’.
^ permalink raw reply [flat|nested] 6+ messages in thread
* bug#24138: SIGSEGV of useradd (from shadow package)
2017-01-31 22:25 ` Ludovic Courtès
@ 2017-02-04 14:42 ` Tomáš Čech
0 siblings, 0 replies; 6+ messages in thread
From: Tomáš Čech @ 2017-02-04 14:42 UTC (permalink / raw)
To: Ludovic Courtès; +Cc: 24138-done
On Tue, 31 Jan 2017 23:25:32 +0100,
Ludovic Courtès wrote:
>
> Hi Tomáš,
>
> Any updates on this bug, or should we close it?
I haven't met this bug since. Let's close it.
Thanks.
S_W
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2017-02-04 14:43 UTC | newest]
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2016-08-03 6:59 bug#24138: SIGSEGV of useradd (from shadow package) Tomáš Čech
2016-08-03 16:56 ` Ludovic Courtès
2016-08-03 23:31 ` Tomáš Čech
2016-09-09 14:29 ` Ludovic Courtès
2017-01-31 22:25 ` Ludovic Courtès
2017-02-04 14:42 ` Tomáš Čech
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