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authorNick Alcock <nick.alcock@oracle.com>2016-12-26 10:08:45 +0100
committerFlorian Weimer <fweimer@redhat.com>2016-12-26 10:08:45 +0100
commit10c85e76c09716e744b4a41006718400b1eb2e84 (patch)
treedb306524b5147cd0ec6a67dd95aeb079d99112cc /string/Makefile
parentde6591238b478bc86b8cf5af01a484114e399213 (diff)
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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/Makefile4
1 files changed, 4 insertions, 0 deletions
diff --git a/string/Makefile b/string/Makefile
index 0816277..64b4c80 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 $^ > $@; \