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| author |   Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2015-07-26 14:59:00 +0200 |
|---|---|---|
| committer |   Catalin Marinas <catalin.marinas@arm.com> | 2015-07-27 18:00:05 +0100 |
| commit | f91b1feada0b6f0a4d33648155b3ded2c4e0707e (patch) | |
| tree | 4108b78d691b26c3dbf69ecc58a82bd6f44ff133 /arch | |
| parent | Linux 4.2-rc4 (diff) | |
| download | linux-dev-f91b1feada0b6f0a4d33648155b3ded2c4e0707e.tar.xz linux-dev-f91b1feada0b6f0a4d33648155b3ded2c4e0707e.zip | |
arm64/efi: map the entire UEFI vendor string before reading it
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: f84d02755f5a ("arm64: add EFI runtime services")
Cc: <stable@vger.kernel.org> # 3.16+
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/kernel/efi.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c index 9d4aa18f2a82..e8ca6eaedd02 100644 --- a/arch/arm64/kernel/efi.c +++ b/arch/arm64/kernel/efi.c @@ -122,12 +122,12 @@ static int __init uefi_init(void) /* Show what we know for posterity */ c16 = early_memremap(efi_to_phys(efi.systab->fw_vendor), - sizeof(vendor)); + sizeof(vendor) * sizeof(efi_char16_t)); if (c16) { for (i = 0; i < (int) sizeof(vendor) - 1 && *c16; ++i) vendor[i] = c16[i]; vendor[i] = '\0'; - early_memunmap(c16, sizeof(vendor)); + early_memunmap(c16, sizeof(vendor) * sizeof(efi_char16_t)); } pr_info("EFI v%u.%.02u by %s\n", |