As for LD_SHOW_AUXV=yes, I tried different combinations and it is always ignored, no matter what.
Thanks for investigating. It might be related to elf notes supplied by kernel.
FreeBSD 9 added these defines: #define AT_CANARY 16 /* Canary for SSP. */ #define AT_CANARYLEN 17 /* Length of the canary. */ #define AT_OSRELDATE 18 /* OSRELDATE. */ #define AT_NCPUS 19 /* Number of CPUs. */ #define AT_PAGESIZES 20 /* Pagesizes. */ #define AT_PAGESIZESLEN 21 /* Number of pagesizes. */ #define AT_STACKPROT 23 /* Initial stack protection. */ And under Linux: #define AT_HWCAP 16 /* Machine dependent hints about #define AT_CLKTCK 17 /* Frequency of times() */ processor capabilities. */ /* This entry gives some information about the FPU initialization performed by the kernel. */ #define AT_FPUCW 18 /* Used FPU control word. */ /* Cache block sizes. */ #define AT_DCACHEBSIZE 19 /* Data cache block size. */ #define AT_ICACHEBSIZE 20 /* Instruction cache block size. */ #define AT_UCACHEBSIZE 21 /* Unified cache block size. */ /* A special ignored value for PPC, used by the kernel to control the interpretation of the AUXV. Must be > 16. */ #define AT_IGNOREPPC 22 /* Entry should be ignored. */ #define AT_SECURE 23 /* Boolean, was exec setuid-like? */ #define AT_BASE_PLATFORM 24 /* String identifying real platforms.*/ #define AT_RANDOM 25 /* Address of 16 random bytes. */ #define AT_EXECFN 31 /* Filename of executable. */ It looks like a collision, namely between AT_STACKPROT x AT_SECURE Petr