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SubjectRe: [Bugme-new] [Bug 15812] New: utsname.domainname not set in x86_32 processes (causing "YPBINDPROC_DOMAIN: domain not bound" errors)
On Mon, 19 Apr 2010 21:29:15 GMT bugzilla-daemon@bugzilla.kernel.org wrote:

> https://bugzilla.kernel.org/show_bug.cgi?id=15812
>
> Summary: utsname.domainname not set in x86_32 processes
> (causing "YPBINDPROC_DOMAIN: domain not bound" errors)
> Product: Platform Specific/Hardware
> Version: 2.5
> Kernel Version: 2.6.34-rc4
> Platform: All
> OS/Version: Linux
> Tree: Mainline
> Status: NEW
> Severity: normal
> Priority: P1
> Component: x86-64
> AssignedTo: platform_x86_64@kernel-bugs.osdl.org
> ReportedBy: adi@hexapodia.org
> CC: hch@lst.de
> Regression: Yes
>
>
> 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):

Just to clarify (?), that's a 32-bit process on a 64-bit kernel, right?


> 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
>
> This results in 32-bit applications that attempt to use libnss_nis's getpwuid()
> to fail with "YPBINDPROC_DOMAIN: Domain not bound", because they use an
> uninitialized value for domainname.
>
> --
> Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email
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---
~Randy


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