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use AT_EXECFN, if available, for dynamic linker to identify main program

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fallback to argv[0] as before. unlike argv[0], AT_EXECFN was a valid
(but possibly relative) pathname for the new program image at the time
the execve syscall was made.

as a special case, ignore AT_EXECFN if it begins with "/proc/", in
order not to give bogus (and possibly harmful) results when fexecve
was used.
This commit is contained in:
Rich Felker 2013-08-23 14:14:47 -04:00
commit cc51505a32
1 changed files with 5 additions and 1 deletions
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6
src/ldso/dynlink.c
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@ -1016,7 +1016,11 @@ void *__dynlink(int argc, char **argv)
}
if (app->tls_size) app->tls_image = (char *)app->base + tls_image;
if (interp_off) lib->name = (char *)app->base + interp_off;
app->name = argv[0];
if ((aux[0] & (1UL<<AT_EXECFN))
&& strncmp((char *)aux[AT_EXECFN], "/proc/", 6))
app->name = (char *)aux[AT_EXECFN];
else
app->name = argv[0];
app->kernel_mapped = 1;
app->dynv = (void *)(app->base + find_dyn(
(void *)aux[AT_PHDR], aux[AT_PHNUM], aux[AT_PHENT]));