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authorVasily Gorbik <gor@linux.ibm.com>2021-05-12 19:42:13 +0200
committerIngo Molnar <mingo@kernel.org>2021-05-12 21:17:01 +0200
commitf66c05d6baf36069c01a02f869bebb75586f2318 (patch)
tree9a4b9a0f7beb3453214f17bee4db3a8934c5e549 /tools
parent46c7405df7de8deb97229eacebcee96d61415f3f (diff)
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.c3
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;