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| author | Florian Weimer <fweimer@redhat.com> | 2021-05-17 09:59:14 +0200 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2021-05-17 10:06:57 +0200 |
| commit | 78b31cc8341ab8268c468cd0f4f988d1d7862a55 (patch) | |
| tree | 52a91d569feb58d40449e34028ffb35b95f6e541 /dlfcn | |
| parent | 23ce1cf35a59a4fdb3dabe073e3d1fe2b76fb0ca (diff) | |
| download | glibc-78b31cc8341ab8268c468cd0f4f988d1d7862a55.zip glibc-78b31cc8341ab8268c468cd0f4f988d1d7862a55.tar.gz glibc-78b31cc8341ab8268c468cd0f4f988d1d7862a55.tar.bz2 | |
elf: Partially initialize ld.so after static dlopen (bug 20802)
After static dlopen, a copy of ld.so is loaded into the inner
namespace, but that copy is not initialized at all. Some
architectures run into serious problems as result, which is why the
_dl_var_init mechanism was invented. With libpthread moving into
libc and parts into ld.so, more architectures impacted, so it makes
sense to switch to a generic mechanism which performs the partial
initialization.
As a result, getauxval now works after static dlopen (bug 20802).
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Diffstat (limited to 'dlfcn')
| -rw-r--r-- | dlfcn/tststatic5.c | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/dlfcn/tststatic5.c b/dlfcn/tststatic5.c index 872e87f..e0a50b7 100644 --- a/dlfcn/tststatic5.c +++ b/dlfcn/tststatic5.c @@ -25,14 +25,9 @@ mapped from a static executable. On targets that support different page sizes, the kernel communicates - the size currently in use via the auxiliary vector. This vector is - available to initial startup, but not any DSOs loaded later on. As - static executables do not export their symbols a DSO cannot access - the value obtained by initial startup and the value therefore has to - be passed on to the DSO and stored within its data area explicitly. - This is performed by a call to DL_STATIC_INIT that is defined in a - target-dependent way, and that on variable page size targets stores - it in the GLRO(dl_pagesize) variable of the DSO's dynamic linker. */ + the size currently in use via the auxiliary vector. The auxiliary + vector and HWCAP/HWCAP2 bits are copied across the static dlopen + boundary in __rtld_static_init. */ static int do_test (void) { |