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| author | Adhemerval Zanella Netto <adhemerval.zanella@linaro.org> | 2022-12-27 18:11:43 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2023-03-27 13:57:55 -0300 |
| commit | 3020f72618e4f1d7338cd42b8bc7b2813e961b5a (patch) | |
| tree | d61cc39cb5aa140de5331cd1a2ba6ab796db0c81 /Makerules | |
| parent | f65ca70deaf38db4ca12458e74cefd8ad9063956 (diff) | |
| download | glibc-3020f72618e4f1d7338cd42b8bc7b2813e961b5a.tar.gz glibc-3020f72618e4f1d7338cd42b8bc7b2813e961b5a.tar.xz glibc-3020f72618e4f1d7338cd42b8bc7b2813e961b5a.zip | |
libio: Remove the usage of __libc_IO_vtables
Instead of using a special ELF section along with a linker script directive to put the IO vtables within the RELRO section, the libio vtables are all moved to an array marked as data.relro (so linker will place in the RELRO segment without the need of extra directives). To avoid static linking namespace issues and including all vtable referenced objects, all required function pointers are set to weak alias. Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Diffstat (limited to 'Makerules')
| -rw-r--r-- | Makerules | 24 |
1 files changed, 0 insertions, 24 deletions
diff --git a/Makerules b/Makerules index 57b3f093c4..16887cb443 100644 --- a/Makerules +++ b/Makerules @@ -544,34 +544,10 @@ $(LINK.o) -shared -static-libgcc -Wl,-O1 $(sysdep-LDFLAGS) \ -L$(subst :, -L,$(rpath-link)) -Wl,-rpath-link=$(rpath-link) endef -ifeq (yes,$(use-default-link)) # If the linker is good enough, we can let it use its default linker script. # In the long term the custom linker script will be removed. shlib-lds = shlib-lds-flags = -else -# binutils only position loadable notes into the first page for binaries, -# not for shared objects -# lld --verbose does not dump a linker script. Use -fuse-ld=bfd. -$(common-objpfx)shlib.lds: $(common-objpfx)config.make $(..)Makerules - $(LINK.o) -shared -Wl,-O1 \ - -nostdlib -nostartfiles -fuse-ld=bfd \ - $(sysdep-LDFLAGS) $(rtld-LDFLAGS) $(LDFLAGS.so) \ - -Wl,--verbose 2>/dev/null | \ - sed > $@T \ - -e '/^=========/,/^=========/!d;/^=========/d' \ - -e 's@^.*\*(\.jcr).*$$@& \ - PROVIDE(__start___libc_IO_vtables = .);\ - __libc_IO_vtables : { *(__libc_IO_vtables) }\ - PROVIDE(__stop___libc_IO_vtables = .);\ - /DISCARD/ : { *(.gnu.glibc-stub.*) }@' - test -s $@T - mv -f $@T $@ -common-generated += shlib.lds - -shlib-lds = $(common-objpfx)shlib.lds -shlib-lds-flags = -T $(shlib-lds) -endif define build-shlib $(build-shlib-helper) -o $@ $(shlib-lds-flags) \ |