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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 /csu | |
| 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 'csu')
| -rw-r--r-- | csu/Makefile | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/csu/Makefile b/csu/Makefile index 3d23f13868..75f36bbbf4 100644 --- a/csu/Makefile +++ b/csu/Makefile @@ -46,6 +46,10 @@ before-compile += $(objpfx)version-info.h # code is compiled with special flags. tests = +CFLAGS-.o += $(no-stack-protector) +CFLAGS-.op += $(no-stack-protector) +CFLAGS-.os += $(no-stack-protector) + ifeq (yes,$(build-shared)) extra-objs += S$(start-installed-name) gmon-start.os ifneq ($(start-installed-name),$(static-start-installed-name)) |