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| author | Dave Young <[email protected]> | 2017-05-26 11:36:51 +0000 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2017-05-28 09:06:17 +0000 |
| commit | 7425826f4f7ac60f2538b06a7f0a5d1006405159 (patch) | |
| tree | 40bf8105a7a5313a6cf146592a85b948b21b3658 /net/unix/af_unix.c | |
| parent | x86/efi: Correct EFI identity mapping under 'efi=old_map' when KASLR is enabled (diff) | |
| download | kernel-7425826f4f7ac60f2538b06a7f0a5d1006405159.tar.gz kernel-7425826f4f7ac60f2538b06a7f0a5d1006405159.zip | |
efi/bgrt: Skip efi_bgrt_init() in case of non-EFI boot
Sabrina Dubroca reported an early panic:
BUG: unable to handle kernel paging request at ffffffffff240001
IP: efi_bgrt_init+0xdc/0x134
[...]
---[ end Kernel panic - not syncing: Attempted to kill the idle task!
... which was introduced by:
7b0a911478c7 ("efi/x86: Move the EFI BGRT init code to early init code")
The cause is that on this machine the firmware provides the EFI ACPI BGRT
table even on legacy non-EFI bootups - which table should be EFI only.
The garbage BGRT data causes the efi_bgrt_init() panic.
Add a check to skip efi_bgrt_init() in case non-EFI bootup to work around
this firmware bug.
Tested-by: Sabrina Dubroca <[email protected]>
Signed-off-by: Dave Young <[email protected]>
Signed-off-by: Ard Biesheuvel <[email protected]>
Signed-off-by: Matt Fleming <[email protected]>
Cc: <[email protected]> # v4.11+
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Fixes: 7b0a911478c7 ("efi/x86: Move the EFI BGRT init code to early init code")
Link: http://lkml.kernel.org/r/[email protected]
[ Rewrote the changelog to be more readable. ]
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'net/unix/af_unix.c')
0 files changed, 0 insertions, 0 deletions