diff options
| 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 /ChangeLog | |
| parent | 49b036bce9f021ae994a85aee8b410d20b29c8b7 (diff) | |
| download | glibc-8e1472d2c1e25e6eabc2059170731365f6d5b3d1.zip glibc-8e1472d2c1e25e6eabc2059170731365f6d5b3d1.tar.gz glibc-8e1472d2c1e25e6eabc2059170731365f6d5b3d1.tar.bz2 | |
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 'ChangeLog')
| -rw-r--r-- | ChangeLog | 22 |
1 files changed, 22 insertions, 0 deletions
@@ -1,3 +1,25 @@ +2017-12-18 Florian Weimer <fweimer@redhat.com> + + [BZ #20204] + ld.so: Harden dl-libc/libdl hooks. + * sysdeps/generic/ldsodefs.h (_dl_init_all_dirs): Update comment. + (rtld_active): New function. + * dlfcn/dladdr.c (__dladdr): Call it. + * dlfcn/dladdr1.c (__dladdr1): Likewise. + * dlfcn/dlclose.c (__dlcose): Likewise. + * dlfcn/dlerror.c (__dlerror): Likewise. + * dlfcn/dlinfo.c (__dlinfo): Likewise. + * dlfcn/dlmopen.c (__dlmopen): Likewise. + * dlfcn/dlopen.c (__dlopen): Likewise. + * dlfcn/dlopenold.c (__dlopen_nocheck): Likewise. + * dlfcn/dlsym.c (__dlsym): Likewise. + * dlfcn/dlvsym.c (__dlvsym): Likewise. + * libio/vtables.c (_IO_vtable_check): Likewise. + * elf/dl-libc.c (__libc_dlopen_mode, __libc_dlsym) + (__libc_dlclose): Likewise. + * elf/rtld.c (dl_main): Update comment on the _dl_init_all_dirs + assignment. + 2017-12-18 Joseph Myers <joseph@codesourcery.com> [BZ #22446] |