efi/x86: Fix the missing KASLR_FLAG bit in boot_params->hdr.loadflags

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From: Yuntao Wang <ytcoode@gmail.com>

[ Commit 01638431c4 upstream ]

When KASLR is enabled, the KASLR_FLAG bit in boot_params->hdr.loadflags
should be set to 1 to propagate KASLR status from compressed kernel to
kernel, just as the choose_random_location() function does.

Currently, when the kernel is booted via the EFI stub, the KASLR_FLAG
bit in boot_params->hdr.loadflags is not set, even though it should be.
This causes some functions, such as kernel_randomize_memory(), not to
execute as expected. Fix it.

Fixes: a1b87d54f4 ("x86/efistub: Avoid legacy decompressor when doing EFI boot")
Signed-off-by: Yuntao Wang <ytcoode@gmail.com>
[ardb: drop 'else' branch clearing KASLR_FLAG]
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Ard Biesheuvel 2024-03-04 12:19:56 +01:00 • committed by Greg Kroah-Hartman

parent 3a396c409a

commit 2402392bed

1 changed files with 2 additions and 0 deletions

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drivers/firmware/efi/libstub/x86-stub.c

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