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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 /sysdeps/unix | |
| parent | 003a27e8195470f470f4d9384ca70d4e9fc8bd1b (diff) | |
| download | glibc-de6591238b478bc86b8cf5af01a484114e399213.tar.gz glibc-de6591238b478bc86b8cf5af01a484114e399213.tar.xz glibc-de6591238b478bc86b8cf5af01a484114e399213.zip | |
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 'sysdeps/unix')
| -rw-r--r-- | sysdeps/unix/make-syscalls.sh | 1 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/x32/getcpu.c | 1 |
2 files changed, 2 insertions, 0 deletions
diff --git a/sysdeps/unix/make-syscalls.sh b/sysdeps/unix/make-syscalls.sh index 58d165e015..123553c1d9 100644 --- a/sysdeps/unix/make-syscalls.sh +++ b/sysdeps/unix/make-syscalls.sh @@ -287,6 +287,7 @@ while read file srcfile caller syscall args strong weak; do (echo '#include <dl-vdso.h>'; \\ echo 'extern void *${strong}_ifunc (void) __asm ("${strong}");'; \\ echo 'void *'; \\ + echo 'inhibit_stack_protector'; \\ echo '${strong}_ifunc (void)'; \\ echo '{'; \\ echo ' PREPARE_VERSION_KNOWN (symver, ${vdso_symver});'; \\ diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/getcpu.c b/sysdeps/unix/sysv/linux/x86_64/x32/getcpu.c index cbac4b3273..8436f9db93 100644 --- a/sysdeps/unix/sysv/linux/x86_64/x32/getcpu.c +++ b/sysdeps/unix/sysv/linux/x86_64/x32/getcpu.c @@ -21,6 +21,7 @@ void *getcpu_ifunc (void) __asm__ ("__getcpu"); void * +inhibit_stack_protector getcpu_ifunc (void) { PREPARE_VERSION (linux26, "LINUX_2.6", 61765110); |