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46908326c6
linux/drivers/firmware/efi
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Ard Biesheuvel 46908326c6 efi: efibc: check for efivars write capability 
Branden reports that commit

  f88814cc25 ("efi/efivars: Expose RT service availability via efivars abstraction")

regresses UEFI platforms that implement GetVariable but not SetVariable
when booting kernels that have EFIBC (bootloader control) enabled.

The reason is that EFIBC is a user of the efivars abstraction, which was
updated to permit users that rely only on the read capability, but not on
the write capability. EFIBC is in the latter category, so it has to check
explicitly whether efivars supports writes.

Fixes: f88814cc25 ("efi/efivars: Expose RT service availability via efivars abstraction")
Tested-by: Branden Sherrell <sherrellbc@gmail.com>
Link: https://lore.kernel.org/linux-efi/AE217103-C96F-4AFC-8417-83EC11962004@gmail.com/
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
2020-09-15 18:22:47 +03:00
..
libstub efi/libstub: Handle unterminated cmdline 2020-08-20 11:18:58 +02:00
test efi_test: get rid of pointless access_ok() 2020-05-29 11:05:54 -04:00
apple-properties.c efi/dev-path-parser: Add struct definition for vendor type device path nodes 2020-02-23 21:59:42 +01:00
arm-init.c efi/libstub: arm: Print CPU boot mode and MMU state at boot 2020-06-17 15:29:11 +02:00
arm-runtime.c mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
capsule-loader.c efi/capsule-loader: Drop superfluous assignment 2020-02-23 21:58:31 +01:00
capsule.c efi: Replace GPL license boilerplate with SPDX headers 2019-02-04 08:27:25 +01:00
cper-arm.c efi: Replace GPL license boilerplate with SPDX headers 2019-02-04 08:27:25 +01:00
cper-x86.c efi: Decode IA32/X64 Context Info structure 2018-05-14 08:57:48 +02:00
cper.c efi: cper: Add support for printing Firmware Error Record Reference 2020-05-14 11:11:20 +02:00
dev-path-parser.c efi/dev-path-parser: Add struct definition for vendor type device path nodes 2020-02-23 21:59:42 +01:00
earlycon.c efi/earlycon: Fix early printk for wider fonts 2020-05-12 12:29:45 +02:00
efi-bgrt.c efi/bgrt: Accept BGRT tables with a version of 0 2020-02-22 23:37:37 +01:00
efi-pstore.c efi/efivars: Expose RT service availability via efivars abstraction 2020-07-09 10:14:29 +03:00
efi.c efi: add missed destroy_workqueue when efisubsys_init fails 2020-08-20 11:18:45 +02:00
efibc.c efi: efibc: check for efivars write capability 2020-09-15 18:22:47 +03:00
efivars.c efi/efivars: Expose RT service availability via efivars abstraction 2020-07-09 10:14:29 +03:00
embedded-firmware.c efi: use sha256() instead of open coding 2020-07-16 21:49:05 +10:00
esrt.c efi/esrt: Fix reference count leak in esre_create_sysfs_entry. 2020-06-15 14:38:56 +02:00
fake_mem.c efi: Fix handling of multiple efi_fake_mem= entries 2020-01-20 08:14:29 +01:00
fake_mem.h x86/efi: Add efi_fake_mem support for EFI_MEMORY_SP 2019-11-07 15:44:23 +01:00
fdtparams.c efi/arm: Rewrite FDT param discovery routines 2020-02-23 21:59:42 +01:00
Kconfig efi: Make it possible to disable efivar_ssdt entirely 2020-06-16 11:01:07 +02:00
Makefile efi/libstub: Avoid linking libstub/lib-ksyms.o into vmlinux 2020-03-08 10:00:06 +01:00
memattr.c efi: Move mem_attr_table out of struct efi 2020-02-23 21:59:42 +01:00
memmap.c efi: Fix handling of multiple efi_fake_mem= entries 2020-01-20 08:14:29 +01:00
rci2-table.c efi: Don't attempt to map RCI2 config table if it doesn't exist 2019-12-10 12:13:02 +01:00
reboot.c efi: Use EFI ResetSystem only when available 2020-02-23 21:59:42 +01:00
runtime-map.c efi: Replace GPL license boilerplate with SPDX headers 2019-02-04 08:27:25 +01:00
runtime-wrappers.c efi: Add 'runtime' pointer to struct efi 2020-02-23 21:59:42 +01:00
tpm.c EFI fixes for v5.7-rc6: 2020-05-22 20:06:25 +02:00
vars.c efi/efivars: Expose RT service availability via efivars abstraction 2020-07-09 10:14:29 +03:00
x86_fake_mem.c x86/efi: Add efi_fake_mem support for EFI_MEMORY_SP 2019-11-07 15:44:23 +01:00