arm64/efi: map the entire UEFI vendor string before reading it

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commit f91b1feada upstream.

At boot, the UTF-16 UEFI vendor string is copied from the system
table into a char array with a size of 100 bytes. However, this
size of 100 bytes is also used for memremapping() the source,
which may not be sufficient if the vendor string exceeds 50
UTF-16 characters, and the placement of the vendor string inside
a 4 KB page happens to leave the end unmapped.

So use the correct '100 * sizeof(efi_char16_t)' for the size of
the mapping.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Fixes: f84d02755f ("arm64: add EFI runtime services")
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

...

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Ard Biesheuvel 2015-07-26 14:59:00 +02:00 • committed by Luis Henriques

parent c433ad7a91

commit 991e893cd6

1 changed files with 2 additions and 2 deletions

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arch/arm64/kernel/efi.c

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