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Date: Mon, 29 Oct 2012 22:17:48 +0400
From: Vasily Kulikov <segoon@...nwall.com>
To: owl-dev@...ts.openwall.com
Subject: Re: glibc
Hi,
Sorry for a delay.
On Mon, Oct 15, 2012 at 23:00 +0400, Dmitry V. Levin wrote:
> > Patch401: glibc-2.3.5-owl-alt-res_randomid.diff
>
> This is problematic due to threading issues, needs work.
Left this unchanged. I'd not touch this patch as I don't really
understand this crypto and might break something by mistake :)
> > Patch407: glibc-2.3.5-owl-alt-resolv-QFIXEDSZ-underfills.diff
>
> Don't remember the fate of this one, will check later.
Looks like the patch needs update. If I understand it correctly, it
explicitly fails to treat undersized responses (IOW, incorrect for sure
DNS answer) as a normal output not to confuse its users.
Also I've failed to update env-sanitize because of some weird linking
problem on i686. The error itself:
gcc -nostdlib -nostartfiles -r -o /usr/src/world/rpm-work-1/BUILD/glibc-2.16.0/build-i686-linux/elf/librtld.os '-Wl,-(' /usr/src/world/rp
m-work-1/BUILD/glibc-2.16.0/build-i686-linux/elf/dl-allobjs.os /usr/src/world/rpm-work-1/BUILD/glibc-2.16.0/build-i686-linux/elf/rtld-libc.
a -lgcc '-Wl,-)' \
-Wl,-Map,/usr/src/world/rpm-work-1/BUILD/glibc-2.16.0/build-i686-linux/elf/librtld.os.map
gcc -nostdlib -nostartfiles -shared -o /usr/src/world/rpm-work-1/BUILD/glibc-2.16.0/build-i686-linux/elf/ld.so \
-Wl,-z,combreloc -Wl,-z,relro -Wl,--hash-style=both -Wl,-z,defs -Wl,-z,now \
/usr/src/world/rpm-work-1/BUILD/glibc-2.16.0/build-i686-linux/elf/librtld.os -Wl,--version-script=/usr/src/world/rpm-work-1/BUILD
/glibc-2.16.0/build-i686-linux/ld.map \
-Wl,-soname=ld-linux.so.2 \
-Wl,-defsym=_begin=0
/usr/src/world/rpm-work-1/BUILD/glibc-2.16.0/build-i686-linux/elf/librtld.os: In function `getenv':
/usr/src/world/rpm-work-1/BUILD/glibc-2.16.0/stdlib/getenv.c:89: undefined reference to `strncmp'
collect2: ld returned 1 exit status
make[3]: *** [/usr/src/world/rpm-work-1/BUILD/glibc-2.16.0/build-i686-linux/elf/ld.so] Error 1
make[3]: Leaving directory `/usr/src/world/rpm-work-1/BUILD/glibc-2.16.0/elf'
make[2]: *** [elf/subdir_lib] Error 2
make[2]: Leaving directory `/usr/src/world/rpm-work-1/BUILD/glibc-2.16.0'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/usr/src/world/rpm-work-1/BUILD/glibc-2.16.0/build-i686-linux'
error: Bad exit status from /usr/src/world/tmp-work/rpm-tmp.58546 (%build)
'strncmp' symbol is present on x86_64, but absent on i686:
$ readelf -s logs/glibc-build-i386/elf/rtld-libc.a | grep strncmp
22: 00000000 0 NOTYPE GLOBAL DEFAULT UND strncmp
File: logs/glibc-build-i386/elf/rtld-libc.a(rtld-strncmp-c.os)
1: 00000000 0 FILE LOCAL DEFAULT ABS strncmp-c.c
15: 00000000 279 FUNC GLOBAL DEFAULT 1 __strncmp_ia32
16: 00000000 279 FUNC GLOBAL DEFAULT 1 __GI_strncmp
$ readelf -s logs/glibc-build-x86_64/elf/rtld-libc.a | grep strncmp
19: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND strncmp
File: logs/glibc-build-x86_64/elf/rtld-libc.a(rtld-strncmp.os)
10: 0000000000000000 33 FUNC GLOBAL DEFAULT 1 strncmp
File: logs/glibc-build-x86_64/elf/rtld-libc.a(rtld-strncmp-ssse3.os)
11: 0000000000000000 33 FUNC GLOBAL DEFAULT 4 __strncmp_ssse3
The direct using of 'getenv' adds the dependency. Commenting 2 usages
of 'getenv' in the patch removed the linking problem.
I'm a bit lost in glibc make files, probably someone already has an
answer?
Thanks,
--
Vasiliy
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