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authorRich Felker <dalias@aerifal.cx>2011-08-23 09:37:39 -0400
committerRich Felker <dalias@aerifal.cx>2011-08-23 09:37:39 -0400
commitdf0b5a49406763aa4719dfad561a5de8924ecd59 (patch)
tree0d5dc42698f2b710dd27156554b10230ba21256b /src/internal/x86_64
parentc0f344160d22d889460573d003cf349626a38184 (diff)
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security hardening: ensure suid programs have valid stdin/out/err
this behavior (opening fds 0-2 for a suid program) is explicitly
allowed (but not required) by POSIX to protect badly-written suid
programs from clobbering files they later open.

this commit does add some cost in startup code, but the availability
of auxv and the security flag will be useful elsewhere in the future.
in particular auxv is needed for static-linked vdso support, which is
still waiting to be committed (sorry nik!)
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