linux-kernel - [PATCH] efi: bump up EFI_MMAP_NR_SLACK

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241209182041.60286-1-hamzamahfooz@linux.microsoft.com>
Date: Mon,  9 Dec 2024 13:20:39 -0500
From: Hamza Mahfooz <hamzamahfooz@...ux.microsoft.com>
To: linux-efi@...r.kernel.org
Cc: Hamza Mahfooz <hamzamahfooz@...ux.microsoft.com>,
	stable@...nel.org,
	Ard Biesheuvel <ardb@...nel.org>,
	Allen Pais <apais@...ux.microsoft.com>,
	Tyler Hicks <code@...icks.com>,
	Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jonathan Marek <jonathan@...ek.ca>,
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] efi: bump up EFI_MMAP_NR_SLACK_SLOTS to 32

Recent platforms require more slack slots than the current value of
EFI_MMAP_NR_SLACK_SLOTS, otherwise they fail to boot. The current
workaround is to append `efi=disable_early_pci_dma` to the kernel's
cmdline. So, bump up EFI_MMAP_NR_SLACK_SLOTS to 32 to allow those
platforms to boot with the aforementioned workaround.

Cc: stable@...nel.org
Cc: Ard Biesheuvel <ardb@...nel.org>
Cc: Allen Pais <apais@...ux.microsoft.com>
Cc: Tyler Hicks <code@...icks.com>
Signed-off-by: Hamza Mahfooz <hamzamahfooz@...ux.microsoft.com>
---
 drivers/firmware/efi/libstub/efistub.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firmware/efi/libstub/efistub.h b/drivers/firmware/efi/libstub/efistub.h
index 76e44c185f29..e95ce6ae5c26 100644
--- a/drivers/firmware/efi/libstub/efistub.h
+++ b/drivers/firmware/efi/libstub/efistub.h
@@ -171,7 +171,7 @@ void efi_set_u64_split(u64 data, u32 *lo, u32 *hi)
  * the EFI memory map. Other related structures, e.g. x86 e820ext, need
  * to factor in this headroom requirement as well.
  */
-#define EFI_MMAP_NR_SLACK_SLOTS	8
+#define EFI_MMAP_NR_SLACK_SLOTS	32
 
 typedef struct efi_generic_dev_path efi_device_path_protocol_t;
 
-- 
2.47.1