* [2.6.34 regression] utsname.domainname not set in x86_32 processes
@ 2010-04-19 19:21 Andy Isaacson
2010-04-19 21:46 ` Andy Isaacson
2010-04-20 3:22 ` Christoph Hellwig
0 siblings, 2 replies; 3+ messages in thread
From: Andy Isaacson @ 2010-04-19 19:21 UTC (permalink / raw)
To: linux-kernel, hch
2.6.34-rc4 uname(2) from a x86_32 process copies out 325 bytes rather
than the 390 bytes that 2.6.31 copied out (and that userland expects):
2.6.31.12% cat foo.c
main()
{
char buf[1000];
memset(buf, 'x', sizeof(buf));
uname(buf);
write(1, buf, sizeof(buf));
return 0;
}
2.6.31.12% i686-linux-gcc foo.c
2.6.31.12% ./a.out | hd
00000000 4c 69 6e 75 78 00 00 00 00 00 00 00 00 00 00 00 |Linux...........|
00000010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00000040 00 63 76 70 65 34 33 30 30 00 00 00 00 00 00 00 |.cvpe4300.......|
00000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00000080 00 00 32 2e 36 2e 33 31 2e 31 32 2d 63 76 70 32 |..2.6.31.12-cvp2|
00000090 30 31 30 30 33 32 39 2d 30 30 31 34 38 2d 67 39 |0100329-00148-g9|
000000a0 61 38 62 36 36 61 00 00 00 00 00 00 00 00 00 00 |a8b66a..........|
000000b0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000000c0 00 00 00 23 36 20 53 4d 50 20 54 75 65 20 41 70 |...#6 SMP Tue Ap|
000000d0 72 20 36 20 31 36 3a 30 33 3a 33 31 20 50 44 54 |r 6 16:03:31 PDT|
000000e0 20 32 30 31 30 00 00 00 00 00 00 00 00 00 00 00 | 2010...........|
000000f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000100 00 00 00 00 78 38 36 5f 36 34 00 00 00 00 00 00 |....x86_64......|
00000110 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00000140 00 00 00 00 00 28 6e 6f 6e 65 29 00 00 00 00 00 |.....(none).....|
00000150 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00000180 00 00 00 00 00 00 78 78 78 78 78 78 78 78 78 78 |......xxxxxxxxxx|
00000190 78 78 78 78 78 78 78 78 78 78 78 78 78 78 78 78 |xxxxxxxxxxxxxxxx|
*
000003e0 78 78 78 78 78 78 78 78 |xxxxxxxx|
000003e8
2.6.34-rc4% ./a.out | hd
00000000 4c 69 6e 75 78 00 00 00 00 00 00 00 00 00 00 00 |Linux...........|
00000010 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00000040 00 63 76 70 2d 6c 6f 61 6e 65 72 2d 31 36 00 00 |.cvp-loaner-16..|
00000050 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00000080 00 00 32 2e 36 2e 33 34 2d 72 63 34 2d 30 30 31 |..2.6.34-rc4-001|
00000090 31 35 2d 67 64 63 35 37 64 61 33 00 00 00 00 00 |15-gdc57da3.....|
000000a0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
000000c0 00 00 00 23 36 20 53 4d 50 20 46 72 69 20 41 70 |...#6 SMP Fri Ap|
000000d0 72 20 31 36 20 31 30 3a 34 31 3a 34 33 20 50 44 |r 16 10:41:43 PD|
000000e0 54 20 32 30 31 30 00 00 00 00 00 00 00 00 00 00 |T 2010..........|
000000f0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00000100 00 00 00 00 78 38 36 5f 36 34 00 00 00 00 00 00 |....x86_64......|
00000110 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
*
00000140 00 00 00 00 00 78 78 78 78 78 78 78 78 78 78 78 |.....xxxxxxxxxxx|
00000150 78 78 78 78 78 78 78 78 78 78 78 78 78 78 78 78 |xxxxxxxxxxxxxxxx|
*
000003e0 78 78 78 78 78 78 78 78 |xxxxxxxx|
000003e8
-andy
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [2.6.34 regression] utsname.domainname not set in x86_32 processes
2010-04-19 19:21 [2.6.34 regression] utsname.domainname not set in x86_32 processes Andy Isaacson
@ 2010-04-19 21:46 ` Andy Isaacson
2010-04-20 3:22 ` Christoph Hellwig
1 sibling, 0 replies; 3+ messages in thread
From: Andy Isaacson @ 2010-04-19 21:46 UTC (permalink / raw)
To: linux-kernel, hch
On Mon, Apr 19, 2010 at 12:21:47PM -0700, Andy Isaacson wrote:
> 2.6.34-rc4 uname(2) from a x86_32 process copies out 325 bytes rather
> than the 390 bytes that 2.6.31 copied out (and that userland expects):
I've verified that this works correctly on 2.6.33, and opened
https://bugzilla.kernel.org/show_bug.cgi?id=15812
Note that this manifests as the following error when a x86_32 process
attempts to use libnss_nis:
YPBINDPROC_DOMAIN: Domain not bound
-andy
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [2.6.34 regression] utsname.domainname not set in x86_32 processes
2010-04-19 19:21 [2.6.34 regression] utsname.domainname not set in x86_32 processes Andy Isaacson
2010-04-19 21:46 ` Andy Isaacson
@ 2010-04-20 3:22 ` Christoph Hellwig
1 sibling, 0 replies; 3+ messages in thread
From: Christoph Hellwig @ 2010-04-20 3:22 UTC (permalink / raw)
To: Andy Isaacson; +Cc: linux-kernel, hch
On Mon, Apr 19, 2010 at 12:21:47PM -0700, Andy Isaacson wrote:
> 2.6.34-rc4 uname(2) from a x86_32 process copies out 325 bytes rather
> than the 390 bytes that 2.6.31 copied out (and that userland expects):
Which means we're missing exactly the domainname field in new_utsname,
which differenciates it from the old utsname structure. Looks like we
end up calling the old uname sscall instead of the new one for some
reason.
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2010-04-20 3:22 UTC | newest]
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2010-04-19 19:21 [2.6.34 regression] utsname.domainname not set in x86_32 processes Andy Isaacson
2010-04-19 21:46 ` Andy Isaacson
2010-04-20 3:22 ` Christoph Hellwig
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