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| author | Vasily Gorbik <gor@linux.ibm.com> | 2021-05-12 20:42:13 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2021-05-12 22:17:01 +0300 |
| commit | f66c05d6baf36069c01a02f869bebb75586f2318 (patch) | |
| tree | 9a4b9a0f7beb3453214f17bee4db3a8934c5e549 /tools | |
| parent | 46c7405df7de8deb97229eacebcee96d61415f3f (diff) | |
| download | linux-f66c05d6baf36069c01a02f869bebb75586f2318.tar.xz | |
objtool/x86: Fix elf_add_alternative() endianness
Currently x86 kernel cross-compiled on big endian system fails at boot with:
kernel BUG at arch/x86/kernel/alternative.c:258!
Corresponding bug condition look like the following:
BUG_ON(feature >= (NCAPINTS + NBUGINTS) * 32);
Fix that by converting alternative feature/cpuid to target endianness.
Fixes: 9bc0bb50727c ("objtool/x86: Rewrite retpoline thunk calls")
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: https://lore.kernel.org/r/patch-2.thread-6c9df9.git-6c9df9a8098d.your-ad-here.call-01620841104-ext-2554@work.hours
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/objtool/arch/x86/decode.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/tools/objtool/arch/x86/decode.c b/tools/objtool/arch/x86/decode.c index cedf3ede7545..24295d39713b 100644 --- a/tools/objtool/arch/x86/decode.c +++ b/tools/objtool/arch/x86/decode.c @@ -19,6 +19,7 @@ #include <objtool/elf.h> #include <objtool/arch.h> #include <objtool/warn.h> +#include <objtool/endianness.h> #include <arch/elf.h> static int is_x86_64(const struct elf *elf) @@ -725,7 +726,7 @@ static int elf_add_alternative(struct elf *elf, return -1; } - alt->cpuid = cpuid; + alt->cpuid = bswap_if_needed(cpuid); alt->instrlen = orig_len; alt->replacementlen = repl_len; |