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Fix buffer overflow when UTF-16 UEFI vendor string is copied from the 

system table into a char array with a size of 100 bytes.
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Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull arm64 fix from Catalin Marinas:
 "Fix buffer overflow when UTF-16 UEFI vendor string is copied from the
  system table into a char array with a size of 100 bytes"

* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
  arm64/efi: map the entire UEFI vendor string before reading it
This commit is contained in:
Linus Torvalds 2015-07-28 11:26:13 -07:00
parent 67eb890e5e f91b1feada
commit d61be4b3f2
1 changed files with 2 additions and 2 deletions
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4
arch/arm64/kernel/efi.c
View File

@ -122,12 +122,12 @@ static int __init uefi_init(void)
/* Show what we know for posterity */ /* Show what we know for posterity */
c16 = early_memremap(efi_to_phys(efi.systab->fw_vendor), c16 = early_memremap(efi_to_phys(efi.systab->fw_vendor),
sizeof(vendor)); sizeof(vendor) * sizeof(efi_char16_t));
if (c16) { if (c16) {
for (i = 0; i < (int) sizeof(vendor) - 1 && *c16; ++i) for (i = 0; i < (int) sizeof(vendor) - 1 && *c16; ++i)
vendor[i] = c16[i]; vendor[i] = c16[i];
vendor[i] = '\0'; 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", pr_info("EFI v%u.%.02u by %s\n",