From: Peter Jones <pjones@redhat.com>
To: Evgeniy Baskov <baskov@ispras.ru>
Cc: Ard Biesheuvel <ardb@kernel.org>, Borislav Petkov <bp@alien8.de>,
Andy Lutomirski <luto@kernel.org>,
Dave Hansen <dave.hansen@linux.intel.com>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Alexey Khoroshilov <khoroshilov@ispras.ru>,
Peter Jones <pjones@redhat.com>,
Mario Limonciello <mario.limonciello@amd.com>,
joeyli <jlee@suse.com>,
lvc-project@linuxtesting.org, x86@kernel.org,
linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-hardening@vger.kernel.org
Subject: [PATCH 2/2] efi/x86: don't try to set page attributes on 0-sized regions.
Date: Tue, 13 Dec 2022 13:04:03 -0500 [thread overview]
Message-ID: <20221213180403.1308507-2-pjones@redhat.com> (raw)
In-Reply-To: <20221213180403.1308507-1-pjones@redhat.com>
In "efi/x86: Explicitly set sections memory attributes", the following
region is defined to help compute page permissions:
/* .setup [image_base, _head] */
efi_adjust_memory_range_protection(image_base,
(unsigned long)_head - image_base,
EFI_MEMORY_RO | EFI_MEMORY_XP);
In at least some cases, that will result in a size of 0, which will
produce an error and a message on the console, though no actual failure
will be caused in the boot process.
This patch checks that case in efi_adjust_memory_range_protection() and
returns the error without logging.
Signed-off-by: Peter Jones <pjones@redhat.com>
---
drivers/firmware/efi/libstub/mem.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/firmware/efi/libstub/mem.c b/drivers/firmware/efi/libstub/mem.c
index d52841adcc2..d20b1986c9e 100644
--- a/drivers/firmware/efi/libstub/mem.c
+++ b/drivers/firmware/efi/libstub/mem.c
@@ -247,6 +247,9 @@ efi_status_t efi_adjust_memory_range_protection(unsigned long start,
efi_physical_addr_t rounded_start, rounded_end;
unsigned long attr_clear;
+ if (size == 0)
+ return EFI_INVALID_PARAMETER;
+
/*
* This function should not be used to modify attributes
* other than writable/executable.
--
2.38.1
next prev parent reply other threads:[~2022-12-13 18:05 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-22 11:12 [PATCH v3 00/24] x86_64: Improvements at compressed kernel stage Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 01/24] x86/boot: Align vmlinuz sections on page size Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 02/24] x86/build: Remove RWX sections and align on 4KB Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 03/24] x86/boot: Set cr0 to known state in trampoline Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 04/24] x86/boot: Increase boot page table size Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 05/24] x86/boot: Support 4KB pages for identity mapping Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 06/24] x86/boot: Setup memory protection for bzImage code Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 07/24] x86/build: Check W^X of vmlinux during build Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 08/24] x86/boot: Map memory explicitly Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 09/24] x86/boot: Remove mapping from page fault handler Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 10/24] efi/libstub: Move helper function to related file Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 11/24] x86/boot: Make console interface more abstract Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 12/24] x86/boot: Make kernel_add_identity_map() a pointer Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 13/24] x86/boot: Split trampoline and pt init code Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 14/24] x86/boot: Add EFI kernel extraction interface Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 15/24] efi/x86: Support extracting kernel from libstub Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 16/24] x86/boot: Reduce lower limit of physical KASLR Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 17/24] x86/boot: Reduce size of the DOS stub Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 18/24] tools/include: Add simplified version of pe.h Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 19/24] x86/build: Cleanup tools/build.c Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 20/24] x86/build: Make generated PE more spec compliant Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 21/24] efi/x86: Explicitly set sections memory attributes Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 22/24] efi/libstub: Add memory attribute protocol definitions Evgeniy Baskov
2023-01-31 8:37 ` Ard Biesheuvel
2023-01-31 10:00 ` Evgeniy Baskov
2023-01-31 10:01 ` Ard Biesheuvel
2022-11-22 11:12 ` [PATCH v3 23/24] efi/libstub: Use memory attribute protocol Evgeniy Baskov
2022-11-22 11:12 ` [PATCH v3 24/24] efi/libstub: Make memory protection warnings include newlines Evgeniy Baskov
2022-12-13 18:03 ` [PATCH v3 00/24] x86_64: Improvements at compressed kernel stage Peter Jones
2022-12-13 18:04 ` [PATCH 1/2] efi/x86: don't set unsupported memory attributes Peter Jones
2022-12-13 18:04 ` Peter Jones [this message]
2022-12-13 18:13 ` [PATCH v3 00/24] x86_64: Improvements at compressed kernel stage Peter Jones
2022-12-13 22:16 ` Evgeniy Baskov
2022-12-14 10:09 ` Ard Biesheuvel
2022-12-14 11:49 ` Evgeniy Baskov
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