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authorFlorian Weimer <fweimer@redhat.com>2017-12-18 20:04:13 +0100
committerFlorian Weimer <fweimer@redhat.com>2017-12-18 20:04:13 +0100
commit8e1472d2c1e25e6eabc2059170731365f6d5b3d1 (patch)
tree5b29308e6b00178a34422b6f7bb7b4f9252801dc /dlfcn/dlopenold.c
parent49b036bce9f021ae994a85aee8b410d20b29c8b7 (diff)
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ld.so: Examine GLRO to detect inactive loader [BZ #20204]
GLRO (_rtld_global_ro) is read-only after initialization and can therefore not be patched at run time, unlike the hook table addresses and their contents, so this is a desirable hardening feature. The hooks are only needed if ld.so has not been initialized, and this happens only after static dlopen (dlmopen uses a single ld.so object across all namespaces). Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Diffstat (limited to 'dlfcn/dlopenold.c')
-rw-r--r--dlfcn/dlopenold.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/dlfcn/dlopenold.c b/dlfcn/dlopenold.c
index a3db500..d899c4e 100644
--- a/dlfcn/dlopenold.c
+++ b/dlfcn/dlopenold.c
@@ -70,7 +70,7 @@ __dlopen_nocheck (const char *file, int mode)
mode |= RTLD_LAZY;
args.mode = mode;
- if (__glibc_unlikely (_dlfcn_hook != NULL))
+ if (!rtld_active ())
return _dlfcn_hook->dlopen (file, mode, RETURN_ADDRESS (0));
return _dlerror_run (dlopen_doit, &args) ? NULL : args.new;