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authorSai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>2018-11-29 18:12:24 +0100
committerIngo Molnar <mingo@kernel.org>2018-11-30 09:10:30 +0100
commit08cfb38f3ef49cfd1bba11a00401451606477d80 (patch)
tree83fb22d971020b45106d0b56f2edf6c4bec03e78 /sound/atmel
parent7e0dabd3010d6041ee0a952c1146b2150a11f1be (diff)
x86/efi: Unmap EFI boot services code/data regions from efi_pgd
efi_free_boot_services(), as the name suggests, frees EFI boot services code/data regions but forgets to unmap these regions from efi_pgd. This means that any code that's running in efi_pgd address space (e.g: any EFI runtime service) would still be able to access these regions but the contents of these regions would have long been over written by someone else. So, it's important to unmap these regions. Hence, introduce efi_unmap_pages() to unmap these regions from efi_pgd. After unmapping EFI boot services code/data regions, any illegal access by buggy firmware to these regions would result in page fault which will be handled by EFI specific fault handler. Signed-off-by: Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Acked-by: Thomas Gleixner <tglx@linutronix.de> Cc: Andy Lutomirski <luto@kernel.org> Cc: Arend van Spriel <arend.vanspriel@broadcom.com> Cc: Bhupesh Sharma <bhsharma@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Eric Snowberg <eric.snowberg@oracle.com> Cc: Hans de Goede <hdegoede@redhat.com> Cc: Joe Perches <joe@perches.com> Cc: Jon Hunter <jonathanh@nvidia.com> Cc: Julien Thierry <julien.thierry@arm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Matt Fleming <matt@codeblueprint.co.uk> Cc: Nathan Chancellor <natechancellor@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sedat Dilek <sedat.dilek@gmail.com> Cc: YiFei Zhu <zhuyifei1999@gmail.com> Cc: linux-efi@vger.kernel.org Link: http://lkml.kernel.org/r/20181129171230.18699-6-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'sound/atmel')
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