diff mbox series

[v2,4/6] riscv: Fix EFI stub usage of KASAN instrumented strcmp function

Message ID 20230123100951.810807-5-alexghiti@rivosinc.com (mailing list archive)
State Superseded
Headers show
Series RISC-V kasan rework | expand

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conchuod/fixes_present success Fixes tag present in non-next series
conchuod/maintainers_pattern success MAINTAINERS pattern errors before the patch: 13 and now 13
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conchuod/kdoc success Errors and warnings before: 0 this patch: 0
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conchuod/build_rv32_defconfig success Build OK
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conchuod/header_inline success No static functions without inline keyword in header files
conchuod/checkpatch warning WARNING: From:/Signed-off-by: email address mismatch: 'From: Alexandre Ghiti <alexghiti@alexghiti.eu.rivosinc.com>' != 'Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>'
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conchuod/build_rv64_nommu_k210_defconfig success Build OK
conchuod/verify_fixes success No Fixes tag
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Commit Message

Alexandre Ghiti Jan. 23, 2023, 10:09 a.m. UTC
From: Alexandre Ghiti <alexghiti@alexghiti.eu.rivosinc.com>

The EFI stub must not use any KASAN instrumented code as the kernel
proper did not initialize the thread pointer and the mapping for the
KASAN shadow region.

Avoid using the generic strcmp function, instead use the one in
drivers/firmware/efi/libstub/string.c.

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
---
 arch/riscv/kernel/image-vars.h | 2 --
 1 file changed, 2 deletions(-)

Comments

Ard Biesheuvel Jan. 23, 2023, 10:19 a.m. UTC | #1
On Mon, 23 Jan 2023 at 11:14, Alexandre Ghiti <alexghiti@rivosinc.com> wrote:
>
> From: Alexandre Ghiti <alexghiti@alexghiti.eu.rivosinc.com>
>
> The EFI stub must not use any KASAN instrumented code as the kernel
> proper did not initialize the thread pointer and the mapping for the
> KASAN shadow region.
>
> Avoid using the generic strcmp function, instead use the one in
> drivers/firmware/efi/libstub/string.c.
>
> Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>

Acked-by: Ard Biesheuvel <ardb@kernel.org>

> ---
>  arch/riscv/kernel/image-vars.h | 2 --
>  1 file changed, 2 deletions(-)
>
> diff --git a/arch/riscv/kernel/image-vars.h b/arch/riscv/kernel/image-vars.h
> index 7e2962ef73f9..15616155008c 100644
> --- a/arch/riscv/kernel/image-vars.h
> +++ b/arch/riscv/kernel/image-vars.h
> @@ -23,8 +23,6 @@
>   * linked at. The routines below are all implemented in assembler in a
>   * position independent manner
>   */
> -__efistub_strcmp               = strcmp;
> -
>  __efistub__start               = _start;
>  __efistub__start_kernel                = _start_kernel;
>  __efistub__end                 = _end;
> --
> 2.37.2
>
diff mbox series

Patch

diff --git a/arch/riscv/kernel/image-vars.h b/arch/riscv/kernel/image-vars.h
index 7e2962ef73f9..15616155008c 100644
--- a/arch/riscv/kernel/image-vars.h
+++ b/arch/riscv/kernel/image-vars.h
@@ -23,8 +23,6 @@ 
  * linked at. The routines below are all implemented in assembler in a
  * position independent manner
  */
-__efistub_strcmp		= strcmp;
-
 __efistub__start		= _start;
 __efistub__start_kernel		= _start_kernel;
 __efistub__end			= _end;