diff options
| author | Ding Hui | 2022-12-27 23:09:36 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2023-01-18 11:58:10 +0100 |
| commit | 5b66b27b9deee212e2404bf4da801b94f4a84589 (patch) | |
| tree | 8acd341d0ac736474965ddb452cc270735adcef1 /include/linux/pr.h | |
| parent | 9a1195c584321d49dd11aad90ce855994b2f4455 (diff) | |
efi: fix userspace infinite retry read efivars after EFI runtime services page fault
commit e006ac3003080177cf0b673441a4241f77aaecce upstream.
After [1][2], if we catch exceptions due to EFI runtime service, we will
clear EFI_RUNTIME_SERVICES bit to disable EFI runtime service, then the
subsequent routine which invoke the EFI runtime service should fail.
But the userspace cat efivars through /sys/firmware/efi/efivars/ will stuck
and infinite loop calling read() due to efivarfs_file_read() return -EINTR.
The -EINTR is converted from EFI_ABORTED by efi_status_to_err(), and is
an improper return value in this situation, so let virt_efi_xxx() return
EFI_DEVICE_ERROR and converted to -EIO to invoker.
Cc: <stable@vger.kernel.org>
Fixes: 3425d934fc03 ("efi/x86: Handle page faults occurring while running EFI runtime services")
Fixes: 23715a26c8d8 ("arm64: efi: Recover from synchronous exceptions occurring in firmware")
Signed-off-by: Ding Hui <dinghui@sangfor.com.cn>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/pr.h')
0 files changed, 0 insertions, 0 deletions