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| author | Florian Weimer <fweimer@redhat.com> | 2017-12-18 20:04:13 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2017-12-18 20:04:13 +0100 |
| commit | 8e1472d2c1e25e6eabc2059170731365f6d5b3d1 (patch) | |
| tree | 5b29308e6b00178a34422b6f7bb7b4f9252801dc /dlfcn/dlopen.c | |
| parent | 49b036bce9f021ae994a85aee8b410d20b29c8b7 (diff) | |
| download | glibc-8e1472d2c1e25e6eabc2059170731365f6d5b3d1.tar.gz glibc-8e1472d2c1e25e6eabc2059170731365f6d5b3d1.tar.xz glibc-8e1472d2c1e25e6eabc2059170731365f6d5b3d1.zip | |
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.c | 2 |
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 |