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| author | Nick Alcock <nick.alcock@oracle.com> | 2016-12-26 10:08:41 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2016-12-26 10:08:41 +0100 |
| commit | de6591238b478bc86b8cf5af01a484114e399213 (patch) | |
| tree | 2717c115fbc7518fcbe9348239ff536eb914d267 /ChangeLog | |
| parent | 003a27e8195470f470f4d9384ca70d4e9fc8bd1b (diff) | |
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Do not stack-protect ifunc resolvers [BZ #7065]
When dynamically linking, ifunc resolvers are called before TLS is
initialized, so they cannot be safely stack-protected.
We avoid disabling stack-protection on large numbers of files by
using __attribute__ ((__optimize__ ("-fno-stack-protector")))
to turn it off just for the resolvers themselves. (We provide
the attribute even when statically linking, because we will later
use it elsewhere too.)
Diffstat (limited to 'ChangeLog')
| -rw-r--r-- | ChangeLog | 25 |
1 files changed, 25 insertions, 0 deletions
@@ -1,4 +1,29 @@ 2016-12-26 Nick Alcock <nick.alcock@oracle.com> + + [BZ #7065] + * configure.ac (HAVE_CC_NO_STACK_PROTECTOR): Define. + * config.h.in (HAVE_CC_NO_STACK_PROTECTOR): New macro. + * include/libc-symbols.h (inhibit_stack_protector): New macro. + (__ifunc_resolver): Use it. + * elf/ifuncdep2.c (foo1_ifunc, foo2_ifunc, foo3_ifunc): Apply + inhibit_stack_protector. + * elf/ifuncmain6pie.c (foo_ifunc): Likewise. + * elf/ifuncmain7.c (foo_ifunc): Likewise. + * elf/ifuncmod1.c (foo_ifunc, foo_hidden_ifunc) + (foo_protected_ifunc): Likewise. + * elf/ifuncmod5.c (foo_ifunc, foo_hidden_ifunc) + (foo_protected_ifunc): Likewise. + * sysdeps/generic/ifunc-sel.h (ifunc_sel, ifunc_one): Likewise. + * sysdeps/nacl/nacl_interface_query.c + (nacl_interface_query_ifunc): Likewise. + * sysdeps/powerpc/ifunc-sel.h (ifunc_sel, ifunc_one): Likewise. + * sysdeps/unix/sysv/linux/x86_64/x32/getcpu.c (getcpu_ifunc): + Likewise. + * sysdeps/x86_64/ifuncmod8.c (foo_ifunc): Likewise. + * sysdeps/unix/make-syscalls.sh: Apply inhibit_stack_protector to + the generated vDSO syscall resolver. + +2016-12-26 Nick Alcock <nick.alcock@oracle.com> Florian Weimer <fweimer@redhat.com> [BZ #7065] |