linux - access /proc/self/auxv from setuid program

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I have a program that reads /proc/self/auxv in order to get the value of AT_EXECFN. I cannot use getauxval because I have to support systems with a glibc older than 2.16.

The program in this case is setuid/setgid. What I am finding is that linux uses different permissions in /proc/self for setuid/setgid binaries. In particular, auxv is root:root with permissions of 400 (readable by user only). I have not been able to find much documentation on this, but that is the behavior I am seeing.

So the question : is it possible to get at the auxiliary vector in a setuid/setgid program?

asked 33 secs ago

Todd Freed

152

linux - access /proc/self/auxv from setuid program