Messages in this thread Patch in this message | | | From | Arvind Sankar <> | Subject | [PATCH 5/5] x86/head/64: Disable stack protection for head$(BITS).o | Date | Wed, 7 Oct 2020 15:53:51 -0400 |
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On 64-bit, the startup_64_setup_env() function added in 866b556efa12 ("x86/head/64: Install startup GDT") has stack protection enabled because of set_bringup_idt_handler().
At this point, %gs is not yet initialized, and this doesn't cause a crash only because the #PF handler from the decompressor stub is still installed and handles the page fault.
Disable stack protection for the whole file, and do it on 32-bit as well to avoid surprises.
Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu> --- arch/x86/kernel/Makefile | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index 04ceea8f4a89..68608bd892c0 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -47,6 +47,8 @@ endif # non-deterministic coverage. KCOV_INSTRUMENT := n +CFLAGS_head$(BITS).o += -fno-stack-protector + CFLAGS_irq.o := -I $(srctree)/$(src)/../include/asm/trace obj-y := process_$(BITS).o signal.o -- 2.26.2
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