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authorArd Biesheuvel <ardb@kernel.org>2025-08-28 12:22:23 +0200
committerBorislav Petkov (AMD) <bp@alien8.de>2025-09-03 18:05:42 +0200
commite7b88bc0051c5062bdd73b58837cf277d0057358 (patch)
tree298ec15fd6815e00e0f373f5dd02595c79fa005f /drivers/firmware/efi/libstub/x86-stub.c
parent7b38dec3c5af54665a4b29483aa02bd1c1e71cf1 (diff)
efistub/x86: Remap inittext read-execute when needed
Recent EFI x86 systems are more strict when it comes to mapping boot images, and require that mappings are either read-write or read-execute. Now that the boot code is being cleaned up and refactored, most of it is being moved into .init.text [where it arguably belongs] but that implies that when booting on such strict EFI firmware, we need to take care to map .init.text (and the .altinstr_aux section that follows it) read-execute as well. Signed-off-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Link: https://lore.kernel.org/20250828102202.1849035-44-ardb+git@google.com
Diffstat (limited to 'drivers/firmware/efi/libstub/x86-stub.c')
-rw-r--r--drivers/firmware/efi/libstub/x86-stub.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c
index cafc90d4caaf..0d05eac7c72b 100644
--- a/drivers/firmware/efi/libstub/x86-stub.c
+++ b/drivers/firmware/efi/libstub/x86-stub.c
@@ -788,7 +788,9 @@ static efi_status_t efi_decompress_kernel(unsigned long *kernel_entry,
*kernel_entry = addr + entry;
- return efi_adjust_memory_range_protection(addr, kernel_text_size);
+ return efi_adjust_memory_range_protection(addr, kernel_text_size) ?:
+ efi_adjust_memory_range_protection(addr + kernel_inittext_offset,
+ kernel_inittext_size);
}
static void __noreturn enter_kernel(unsigned long kernel_addr,