all your __guard are belong to __stack_smash_handler

okay here we go

>>> Regenerating /etc/ld.so.cache...
>>> sys-libs/gxslibc-2.6.1-r2 merged.

>>> No packages selected for removal by clean
>>> Auto-cleaning packages...

>>> No outdated packages were found on your system.
* Regenerating GNU info directory index...
* Processed 87 info files.

TMPFS chroot001 miranda ~ # export STATIC="-fstack-protector-all"; gcc-3.4.6 "${STATIC}" -fstack-protector-all -o vuln-stack vuln-stack.c && file vuln-stack && readelf -s vuln-stack | egrep "__guard|__stack_smash"; ./vuln-stack 1234567891234567; einfo "return code: ${?}"; echo; gcc-3.4.6 "${STATIC}" -fstack-protector-all -o ssp_entropy ssp_entropy.c && file ssp_entropy && ./ssp_entropy
vuln-stack: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.6.18, dynamically linked (uses shared libs), not stripped
2: 08049698 4 OBJECT GLOBAL DEFAULT 23 __guard@GLIBC_2.3.2 (3)
4: 00000000 30 FUNC GLOBAL DEFAULT UND __stack_smash_handler@GLIBC_2.3.2 (3)
78: 08049698 4 OBJECT GLOBAL DEFAULT 23 __guard@@GLIBC_2.3.2
80: 00000000 30 FUNC GLOBAL DEFAULT UND __stack_smash_handler@@GL
* return code: 46

ssp_entropy: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.6.18, dynamically linked (uses shared libs), not stripped
__guard: [[0x288a2b8c]]

TMPFS chroot001 miranda ~ # export STATIC="-static"; gcc-3.4.6 "${STATIC}" -fstack-protector-all -o vuln-stack vuln-stack.c && file vuln-stack && readelf -s vuln-stack | egrep "__guard|__stack_smash"; ./vuln-stack 1234567891234567; einfo "return code: ${?}"; echo; gcc-3.4.6 "${STATIC}" -fstack-protector-all -o ssp_entropy ssp_entropy.c && file ssp_entropy && ./ssp_entropy
vuln-stack: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.6.18, statically linked, not stripped
1346: 0804f810 18 FUNC GLOBAL DEFAULT 3 __stack_smash_handler
1554: 080bc370 4 OBJECT GLOBAL DEFAULT 16 __guard
* return code: 46

ssp_entropy: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.6.18, statically linked, not stripped
__guard: [[0xe686ece4]]

i invented return code 46 as SSP failure because i could not find a list of valid exit codes (unless segfault which is 127) at google.

-Alex