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1bdda52fe9
This patch moves the vDSO setup from libc to loader code, just after the vDSO link_map setup. For static case the initialization is moved to _dl_non_dynamic_init instead. Instead of using the mangled pointer, the vDSO data is set as attribute_relro (on _rtld_global_ro for shared or _dl_vdso_* for static). It is read-only even with partial relro. It fixes BZ#24967 now that the vDSO pointer is setup earlier than malloc interposition is called. Also, vDSO calls should not be a problem for static dlopen as indicated by BZ#20802. The vDSO pointer would be zero-initialized and the syscall will be issued instead. Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu, arm-linux-gnueabihf, powerpc64le-linux-gnu, powerpc64-linux-gnu, powerpc-linux-gnu, s390x-linux-gnu, sparc64-linux-gnu, and sparcv9-linux-gnu. I also run some tests on mips. Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org> |
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| .. | ||
| bits | ||
| rv64 | ||
| sys | ||
| atomic-machine.h | ||
| clone.S | ||
| configure | ||
| configure.ac | ||
| dl-cache.h | ||
| flush-icache.c | ||
| getcontext.S | ||
| Implies | ||
| kernel-features.h | ||
| ldconfig.h | ||
| ldd-rewrite.sed | ||
| localplt.data | ||
| makecontext.c | ||
| Makefile | ||
| readelflib.c | ||
| register-dump.h | ||
| setcontext.S | ||
| shlib-versions | ||
| sigcontextinfo.h | ||
| swapcontext.S | ||
| syscall.c | ||
| sysdep.h | ||
| sysdep.S | ||
| ucontext_i.sym | ||
| ucontext-macros.h | ||
| Versions | ||
| vfork.S | ||