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| author | Nick Alcock <nick.alcock@oracle.com> | 2016-12-26 10:08:45 +0100 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2016-12-26 10:08:45 +0100 |
| commit | 10c85e76c09716e744b4a41006718400b1eb2e84 (patch) | |
| tree | db306524b5147cd0ec6a67dd95aeb079d99112cc /string/Makefile | |
| parent | de6591238b478bc86b8cf5af01a484114e399213 (diff) | |
| download | glibc-10c85e76c09716e744b4a41006718400b1eb2e84.tar.gz glibc-10c85e76c09716e744b4a41006718400b1eb2e84.tar.xz glibc-10c85e76c09716e744b4a41006718400b1eb2e84.zip | |
Disable stack protector in early static initialization [BZ #7065]
The startup code in csu/, and the brk and sbrk functions are needed very early in initialization of a statically-linked program, before the stack guard is initialized; TLS initialization also uses memcpy, which cannot overrun its own stack. Mark all of these as -fno-stack-protector. We also finally introduce @libc_cv_ssp@ and @no_stack_protector@, both substituted by the configury changes made earlier, to detect the case when -fno-stack-protector is supported by the compiler, and unconditionally pass it in when this is the case, whether or not --enable-stack-protector is passed to configure. (This means that it'll even work when the compiler's been hacked to pass -fstack-protector by default, unless the hackage is so broken that it does so in a way that is impossible to override.)
Diffstat (limited to 'string/Makefile')
| -rw-r--r-- | string/Makefile | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/string/Makefile b/string/Makefile index 081627734d..64b4c80eaa 100644 --- a/string/Makefile +++ b/string/Makefile @@ -73,6 +73,10 @@ CFLAGS-test-ffs.c = -fno-builtin CFLAGS-tst-inlcall.c = -fno-builtin CFLAGS-tst-xbzero-opt.c = -O3 +# Called during TLS initialization. +CFLAGS-memcpy.c = $(no-stack-protector) +CFLAGS-wordcopy.c = $(no-stack-protector) + ifeq ($(run-built-tests),yes) $(objpfx)tst-svc-cmp.out: tst-svc.expect $(objpfx)tst-svc.out cmp $^ > $@; \ |