path: root/arch/um/sys-x86_64/Makefile
diff options
authorPaolo 'Blaisorblade' Giarrusso <>2006-05-01 12:16:04 -0700
committerLinus Torvalds <>2006-05-01 18:17:45 -0700
commit275e6e1ee2bafde77e9390b27e876fa83f24cb60 (patch)
treefca0c0a7e3bdabe82bc75a0dad5c765f3b6edaf0 /arch/um/sys-x86_64/Makefile
parentcb8aa3d29b562e4c16fdfa4ecc8170ddc55397f4 (diff)
[PATCH] uml: fix compilation and execution with hardened GCC
To make some half-assembly stubs compile, disable various "hardened" GCC features: *) we can't make it build PIC code as we need %ebx to do syscalls and GCC wants it free for PIC *) we can't leave stack protection as the stub is moved (not relocated!) in memory so the RIP-relative access to the canary tries reading from an unmapped address and causes a segfault, since we move the stub of various megabytes (the exact amount will be decided at runtime) away from the link-time address. Signed-off-by: Paolo 'Blaisorblade' Giarrusso <> Acked-by: Jeff Dike <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'arch/um/sys-x86_64/Makefile')
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/um/sys-x86_64/Makefile b/arch/um/sys-x86_64/Makefile
index f739bea35195..6d3b29c74533 100644
--- a/arch/um/sys-x86_64/Makefile
+++ b/arch/um/sys-x86_64/Makefile
@@ -21,6 +21,8 @@ USER_OBJS := ptrace_user.o sigcontext.o stub_segv.o
USER_OBJS += user-offsets.s
extra-y += user-offsets.s
extra-$(CONFIG_MODE_TT) += unmap.o
include arch/um/scripts/Makefile.rules