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authorArvind Sankar <nivedita@alum.mit.edu>2019-09-23 20:17:54 +0300
committerIngo Molnar <mingo@kernel.org>2019-09-23 20:48:02 +0300
commitca14c996afe7228ff9b480cf225211cc17212688 (patch)
tree4b0f3876f364968a5fb2367af44a5a0d7e3782de /arch/x86
parent7f2444d38f6bbfa12bc15e2533d8f9daa85ca02b (diff)
downloadlinux-ca14c996afe7228ff9b480cf225211cc17212688.tar.xz
x86/purgatory: Disable the stackleak GCC plugin for the purgatory
Since commit: b059f801a937 ("x86/purgatory: Use CFLAGS_REMOVE rather than reset KBUILD_CFLAGS") kexec breaks if GCC_PLUGIN_STACKLEAK=y is enabled, as the purgatory contains undefined references to stackleak_track_stack. Attempting to load a kexec kernel results in this failure: kexec: Undefined symbol: stackleak_track_stack kexec-bzImage64: Loading purgatory failed Fix this by disabling the stackleak plugin for the purgatory. Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com> Cc: Borislav Petkov <bp@alien8.de> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Fixes: b059f801a937 ("x86/purgatory: Use CFLAGS_REMOVE rather than reset KBUILD_CFLAGS") Link: https://lkml.kernel.org/r/20190923171753.GA2252517@rani.riverdale.lan Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/purgatory/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/purgatory/Makefile b/arch/x86/purgatory/Makefile
index 10fb42da0007..b81b5172cf99 100644
--- a/arch/x86/purgatory/Makefile
+++ b/arch/x86/purgatory/Makefile
@@ -23,6 +23,7 @@ KCOV_INSTRUMENT := n
PURGATORY_CFLAGS_REMOVE := -mcmodel=kernel
PURGATORY_CFLAGS := -mcmodel=large -ffreestanding -fno-zero-initialized-in-bss
+PURGATORY_CFLAGS += $(DISABLE_STACKLEAK_PLUGIN)
# Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That
# in turn leaves some undefined symbols like __fentry__ in purgatory and not