use AT_EXECFN, if available, for dynamic linker to identify main program
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.
diff --git a/src/ldso/dynlink.c b/src/ldso/dynlink.c
index 6f23fa5..cbddeba 100644
--- a/src/ldso/dynlink.c
+++ b/src/ldso/dynlink.c
@@ -1016,7 +1016,11 @@
}
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]));