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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/dlopen.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/dlopen.c')
-rw-r--r--dlfcn/dlopen.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/dlfcn/dlopen.c b/dlfcn/dlopen.c
index 22120655d2..73651a8430 100644
--- a/dlfcn/dlopen.c
+++ b/dlfcn/dlopen.c
@@ -74,7 +74,7 @@ void *
 __dlopen (const char *file, int mode DL_CALLER_DECL)
 {
 # ifdef SHARED
-  if (__glibc_unlikely (_dlfcn_hook != NULL))
+  if (!rtld_active ())
     return _dlfcn_hook->dlopen (file, mode, DL_CALLER);
 # endif