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| author |   Ard Biesheuvel <ardb@kernel.org> | 2021-07-26 16:24:01 +0200 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2021-08-03 07:43:07 +0200 |
| commit | ff80ef5bf5bd59e5eab82d1d846acc613ebbf6c4 (patch) | |
| tree | 5112b8bff7532ef4f26bdcb4404117387d2c8c47 /drivers/firmware | |
| parent | efi/libstub: arm64: Relax 2M alignment again for relocatable kernels (diff) | |
| download | linux-dev-ff80ef5bf5bd59e5eab82d1d846acc613ebbf6c4.tar.xz linux-dev-ff80ef5bf5bd59e5eab82d1d846acc613ebbf6c4.zip | |
efi/libstub: arm64: Warn when efi_random_alloc() fails
Randomization of the physical load address of the kernel image relies on
efi_random_alloc() returning successfully, and currently, we ignore any
failures and just carry on, using the ordinary, non-randomized page
allocator routine. This means we never find out if a failure occurs,
which could harm security, so let's at least warn about this condition.
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'drivers/firmware')
| -rw-r--r-- | drivers/firmware/efi/libstub/arm64-stub.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/firmware/efi/libstub/arm64-stub.c b/drivers/firmware/efi/libstub/arm64-stub.c index 6f214c9c303e..010564f8bbc4 100644 --- a/drivers/firmware/efi/libstub/arm64-stub.c +++ b/drivers/firmware/efi/libstub/arm64-stub.c @@ -130,6 +130,8 @@ efi_status_t handle_kernel_image(unsigned long *image_addr, */ status = efi_random_alloc(*reserve_size, min_kimg_align, reserve_addr, phys_seed); + if (status != EFI_SUCCESS) + efi_warn("efi_random_alloc() failed: 0x%lx\n", status); } else { status = EFI_OUT_OF_RESOURCES; } |