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arm64/efi: isolate EFI stub from the kernel proper
Since arm64 does not use a builtin decompressor, the EFI stub is built into the kernel proper. So far, this has been working fine, but actually, since the stub is in fact a PE/COFF relocatable binary that is executed at an unknown offset in the 1:1 mapping provided by the UEFI firmware, we should not be seamlessly sharing code with the kernel proper, which is a position dependent executable linked at a high virtual offset. So instead, separate the contents of libstub and its dependencies, by putting them into their own namespace by prefixing all of its symbols with __efistub. This way, we have tight control over what parts of the kernel proper are referenced by the stub. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Reviewed-by: Matt Fleming <matt.fleming@intel.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| /* | ||
| * Taken from: | ||
| * linux/lib/string.c | ||
| * | ||
| * Copyright (C) 1991, 1992 Linus Torvalds | ||
| */ | ||
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| #include <linux/types.h> | ||
| #include <linux/string.h> | ||
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| #ifndef __HAVE_ARCH_STRSTR | ||
| /** | ||
| * strstr - Find the first substring in a %NUL terminated string | ||
| * @s1: The string to be searched | ||
| * @s2: The string to search for | ||
| */ | ||
| char *strstr(const char *s1, const char *s2) | ||
| { | ||
| size_t l1, l2; | ||
|
|
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| l2 = strlen(s2); | ||
| if (!l2) | ||
| return (char *)s1; | ||
| l1 = strlen(s1); | ||
| while (l1 >= l2) { | ||
| l1--; | ||
| if (!memcmp(s1, s2, l2)) | ||
| return (char *)s1; | ||
| s1++; | ||
| } | ||
| return NULL; | ||
| } | ||
| #endif | ||
|
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| #ifndef __HAVE_ARCH_STRNCMP | ||
| /** | ||
| * strncmp - Compare two length-limited strings | ||
| * @cs: One string | ||
| * @ct: Another string | ||
| * @count: The maximum number of bytes to compare | ||
| */ | ||
| int strncmp(const char *cs, const char *ct, size_t count) | ||
| { | ||
| unsigned char c1, c2; | ||
|
|
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| while (count) { | ||
| c1 = *cs++; | ||
| c2 = *ct++; | ||
| if (c1 != c2) | ||
| return c1 < c2 ? -1 : 1; | ||
| if (!c1) | ||
| break; | ||
| count--; | ||
| } | ||
| return 0; | ||
| } | ||
| #endif |