From: Ard Biesheuvel <ardb@kernel.org>
To: linux-efi@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org,
Ard Biesheuvel <ardb@kernel.org>, Peter Jones <pjones@redhat.com>,
Gerd Hoffmann <kraxel@redhat.com>,
Ilias Apalodimas <ilias.apalodimas@linaro.org>,
Kees Cook <keescook@chromium.org>,
stable@vger.kernel.org
Subject: [PATCH 1/3] efi/libstub: zboot: Mark zboot EFI application as NX compatible
Date: Fri, 10 Mar 2023 13:50:24 +0100 [thread overview]
Message-ID: <20230310125026.3390928-2-ardb@kernel.org> (raw)
In-Reply-To: <20230310125026.3390928-1-ardb@kernel.org>
Now that the zboot loader will invoke the EFI memory attributes protocol
to remap the decompressed code and rodata as read-only/executable, we
can set the PE/COFF header flag that indicates to the firmware that the
application does not rely on writable memory being executable at the
same time.
Cc: <stable@vger.kernel.org> # v6.2+
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
| 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--git a/drivers/firmware/efi/libstub/zboot-header.S b/drivers/firmware/efi/libstub/zboot-header.S
index ec4525d40e0cf6d6..445cb646eaaaf1c6 100644
--- a/drivers/firmware/efi/libstub/zboot-header.S
+++ b/drivers/firmware/efi/libstub/zboot-header.S
@@ -63,7 +63,7 @@ __efistub_efi_zboot_header:
.long .Lefi_header_end - .Ldoshdr
.long 0
.short IMAGE_SUBSYSTEM_EFI_APPLICATION
- .short 0
+ .short IMAGE_DLL_CHARACTERISTICS_NX_COMPAT
#ifdef CONFIG_64BIT
.quad 0, 0, 0, 0
#else
--
2.39.2
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next prev parent reply other threads:[~2023-03-10 12:51 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-10 12:50 [PATCH 0/3] efi: arm64: Set NX compat flag where appropriate Ard Biesheuvel
2023-03-10 12:50 ` Ard Biesheuvel [this message]
2023-03-10 12:50 ` [PATCH 2/3] efi/libstub: arm64: Remap relocated image with strict permissions Ard Biesheuvel
2023-03-10 12:50 ` [PATCH 3/3] arm64: efi: Set NX compat flag in PE/COFF header Ard Biesheuvel
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