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From: Arvind Sankar <nivedita@alum.mit.edu>
To: Ard Biesheuvel <ardb@kernel.org>
Cc: linux-efi@vger.kernel.org, x86@kernel.org,
	linux-kernel@vger.kernel.org, Ingo Molnar <mingo@redhat.com>,
	Borislav Petkov <bp@alien8.de>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH 5/5] efi/x86: Check for bad relocations
Date: Wed, 15 Apr 2020 18:15:20 -0400	[thread overview]
Message-ID: <20200415221520.2692512-6-nivedita@alum.mit.edu> (raw)
In-Reply-To: <20200415221520.2692512-1-nivedita@alum.mit.edu>

Add relocation checking for x86 as well to catch non-PC-relative
relocations that require runtime processing, since the EFI stub does not
do any runtime relocation processing.

This will catch, for example, data relocations created by static
initializers of pointers.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
---
 drivers/firmware/efi/libstub/Makefile | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/firmware/efi/libstub/Makefile b/drivers/firmware/efi/libstub/Makefile
index 0bb2916eb12b..2aff59812a54 100644
--- a/drivers/firmware/efi/libstub/Makefile
+++ b/drivers/firmware/efi/libstub/Makefile
@@ -96,6 +96,8 @@ STUBCOPY_RELOC-$(CONFIG_ARM)	:= R_ARM_ABS
 # .bss section here so it's easy to pick out in the linker script.
 #
 STUBCOPY_FLAGS-$(CONFIG_X86)	+= --rename-section .bss=.bss.efistub,load,alloc
+STUBCOPY_RELOC-$(CONFIG_X86_32) := 'R_X86_32_(8|16|32)'
+STUBCOPY_RELOC-$(CONFIG_X86_64) := 'R_X86_64_(8|16|32|32S|64)'
 
 $(obj)/%.stub.o: $(obj)/%.o FORCE
 	$(call if_changed,stubcopy)
@@ -107,16 +109,14 @@ $(obj)/%.stub.o: $(obj)/%.o FORCE
 # this time, use objcopy and leave all sections in place.
 #
 
-cmd_stubrelocs_check-y = /bin/true
-
-cmd_stubrelocs_check-$(CONFIG_EFI_ARMSTUB) =				\
+cmd_stubrelocs_check =							\
 	$(STRIP) --strip-debug -o $@ $<;				\
-	if $(OBJDUMP) -r $@ | grep $(STUBCOPY_RELOC-y); then		\
+	if $(OBJDUMP) -r $@ | grep -E $(STUBCOPY_RELOC-y); then		\
 		echo "$@: absolute symbol references not allowed in the EFI stub" >&2; \
 		/bin/false;						\
 	fi
 
 quiet_cmd_stubcopy = STUBCPY $@
       cmd_stubcopy =							\
-	$(cmd_stubrelocs_check-y);					\
+	$(cmd_stubrelocs_check);					\
 	$(OBJCOPY) $(STUBCOPY_FLAGS-y) $< $@
-- 
2.24.1


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  parent reply	other threads:[~2020-04-15 22:16 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-15 22:15 [PATCH 0/5] efi: Remove __efistub_global annotation Arvind Sankar
2020-04-15 22:15 ` [PATCH 1/5] efi/arm: " Arvind Sankar
2020-04-16  7:50   ` Ard Biesheuvel
2020-04-15 22:15 ` [PATCH 2/5] efi/libstub: Factor out relocation checking Arvind Sankar
2020-04-15 22:15 ` [PATCH 3/5] efi/x86: Remove __efistub_global annotation Arvind Sankar
2020-04-16  7:51   ` Ard Biesheuvel
2020-04-15 22:15 ` [PATCH 4/5] efi: Kill __efistub_global Arvind Sankar
2020-04-16  7:51   ` Ard Biesheuvel
2020-04-15 22:15 ` Arvind Sankar [this message]
2020-04-16  7:38   ` [PATCH 5/5] efi/x86: Check for bad relocations Ard Biesheuvel
2020-04-16 14:48     ` Arvind Sankar
2020-04-16 15:12 ` [PATCH v2 0/3] efi: Remove __efistub_global annotation Arvind Sankar
2020-04-16 16:01   ` Ard Biesheuvel
2020-04-16 15:12 ` [PATCH v2 1/3] efi/arm: " Arvind Sankar
2020-04-16 15:12 ` [PATCH v2 2/3] efi/x86: Remove __efistub_global and add relocation check Arvind Sankar
2020-04-16 15:12 ` [PATCH v2 3/3] efi: Kill __efistub_global Arvind Sankar

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