Messages in this thread Patch in this message | | | From | Masami Hiramatsu <> | Subject | [PATCH 1/3] x86/sev-es: Fix not using prefixes.nbytes for loop over prefixes.bytes | Date | Wed, 2 Dec 2020 17:51:04 +0900 |
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Since the insn.prefixes.nbytes can be bigger than the size of insn.prefixes.bytes[] when a same prefix is repeated, we have to check whether the insn.prefixes.bytes[i] != 0 and i < 4 instead of insn.prefixes.nbytes.
Fixes: 25189d08e516 ("x86/sev-es: Add support for handling IOIO exceptions") Reported-by: Kees Cook <keescook@chromium.org> Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> --- arch/x86/boot/compressed/sev-es.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/boot/compressed/sev-es.c b/arch/x86/boot/compressed/sev-es.c index 954cb2702e23..6a7a3027c9ac 100644 --- a/arch/x86/boot/compressed/sev-es.c +++ b/arch/x86/boot/compressed/sev-es.c @@ -36,7 +36,7 @@ static bool insn_has_rep_prefix(struct insn *insn) insn_get_prefixes(insn); - for (i = 0; i < insn->prefixes.nbytes; i++) { + for (i = 0; insn->prefixes.bytes[i] && i < 4; i++) { insn_byte_t p = insn->prefixes.bytes[i]; if (p == 0xf2 || p == 0xf3)
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