On Mon, Oct 22, 2007 at 12:07:30PM +0200, Simon Vallet via RT wrote:
> Hi,
>
> On 10/22/07, Andy Polyakov via RT <[EMAIL PROTECTED]> wrote:
>
> > > avc: denied { execmod } for pid=1875 comm="ntpdate" \
> > > path="/usr/lib/i686/cmov/libcrypto.so.0.9.8" dev=sda8 ino=325290 \
> > > scontext=system_u:system_r:initrc_t:s0 \
> > > tcontext=system_u:object_r:lib_t:s0 tclass=file
> >
> > How do you map this message to "still contain text relocations"?
>
>
> Well, I don't have access to the box right now, but running
> eu-findtextrel (http://people.redhat.com/drepper/textrelocs.html)
> on the optimized .so files indicates that some object files contain
> such relocations
On a Debian system, I see:
objdump -p /usr/lib/i686/cmov/libcrypto.so.0.9.8 |grep TEXTREL
TEXTREL 0x0
$ eu-findtextrel /usr/lib/i686/cmov/libcrypto.so.0.9.8
either the file containing the function '_init' or the file containing the
function 'CRYPTO_num_locks' is not compiled with -fpic/-fPIC
the file containing the function 'DES_encrypt3' is not compiled with
-fpic/-fPICthe file containing the function 'DES_decrypt3' is not compiled with
-fpic/-fPICthe file containing the function 'DES_ncbc_encrypt' is not compiled
with -fpic/-fPIC
the file containing the function 'DES_ede3_cbc_encrypt' is not compiled with
-fpic/-fPIC
the file containing the function 'AES_encrypt' is not compiled with -fpic/-fPIC
the file containing the function 'AES_cbc_encrypt' is not compiled with
-fpic/-fPIC
the file containing the function 'AES_decrypt' is not compiled with -fpic/-fPIC
the file containing the function 'AES_set_decrypt_key' is not compiled with
-fpic/-fPIC
the file containing the function 'BF_cbc_encrypt' is not compiled with
-fpic/-fPIC
$ eu-findtextrel /usr/lib/i686/cmov/libssl.so.0.9.8
eu-findtextrel: no text relocations reported in
'/usr/lib/i686/cmov/libssl.so.0.9.8'
All files were build using -fPIC and -Wa,--noexecstack
The 486, 586 and 686 version all have the text relocations,
the 386 (that doesn't use any assembler) doesn't have it.
A full build log is available on:
http://buildd.debian.org/fetch.cgi?pkg=openssl;ver=0.9.8g-1;arch=i386;stamp=1192885956
> > Looking at the build system, it seems the culprits are the following
> > > files:
> > >
> > > crypto/x86cpuid-elf.s
> > > crypto/des/dx86-elf.s
> > > crypto/aes/ax86-elf.s
> > > crypto/bf/bx86-elf.s
> >
> > Well, these .o files can contain relocations, but they get resolved and
> > *disappear* when libcrypto.so is linked. If you want confirmation that
> > they disappear run 'readelf -r libcrypto.so' and verify that no
> > relocations are accounted to .text segment [you'd have to run 'readelf
> > -e libcrypto.so' to find where .text is located].
Section Headers:
[Nr] Name Type Addr Off Size ES Flg Lk Inf Al
[...]
[12] .text PROGBITS 00045a40 045a40 0ce574 00 AX 0 0 64
[13] .fini PROGBITS 00113fb4 113fb4 00001c 00 AX 0 0 4
So .text goes from 0x00045a40 to 0x00113fb3
Relocation section '.rel.dyn' at offset 0x29ca8 contains 9054 entries:
Offset Info Type Sym.Value Sym. Name
[...]
0006360c 000ce102 R_386_PC32 000626f0 DES_encrypt2
00063620 000ce102 R_386_PC32 000626f0 DES_encrypt2
00063634 000ce102 R_386_PC32 000626f0 DES_encrypt2
0006373c 000ce102 R_386_PC32 000626f0 DES_encrypt2
00063750 000ce102 R_386_PC32 000626f0 DES_encrypt2
00063764 000ce102 R_386_PC32 000626f0 DES_encrypt2
00063832 000cde02 R_386_PC32 000617c0 DES_encrypt1
0006389a 000cde02 R_386_PC32 000617c0 DES_encrypt1
000638cb 000cde02 R_386_PC32 000617c0 DES_encrypt1
00063917 000cde02 R_386_PC32 000617c0 DES_encrypt1
00063a1b 000ce302 R_386_PC32 00063580 DES_encrypt3
00063a83 000ce302 R_386_PC32 00063580 DES_encrypt3
00063abb 0009da02 R_386_PC32 000636b0 DES_decrypt3
00063b07 0009da02 R_386_PC32 000636b0 DES_decrypt3
00068973 000a8902 R_386_PC32 00067ec0 _x86_AES_encrypt
000696a6 000a8902 R_386_PC32 00067ec0 _x86_AES_encrypt
00069557 00021902 R_386_PC32 00068990 _x86_AES_decrypt
00069854 00021902 R_386_PC32 00068990 _x86_AES_decrypt
00069903 00021902 R_386_PC32 00068990 _x86_AES_decrypt
00069c7b 00090102 R_386_PC32 000699b0 AES_set_encrypt_key
0006be95 00018402 R_386_PC32 0006b600 BF_encrypt
0006bf05 00018402 R_386_PC32 0006b600 BF_encrypt
0006bf3f 000c3e02 R_386_PC32 0006ba20 BF_decrypt
0006bf93 000c3e02 R_386_PC32 0006ba20 BF_decrypt
There is also an:
0003ed81 00057d02 R_386_PC32 00045d40 OPENSSL_cpuid_setup
Which is in section .init
Kurt
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