diff options
| -rw-r--r-- | arch/x86/include/asm/insn.h | 2 | ||||
| -rw-r--r-- | arch/x86/lib/insn.c | 7 |
2 files changed, 8 insertions, 1 deletions
diff --git a/arch/x86/include/asm/insn.h b/arch/x86/include/asm/insn.h index 47f29b1..e7814b7 100644 --- a/arch/x86/include/asm/insn.h +++ b/arch/x86/include/asm/insn.h @@ -69,7 +69,7 @@ struct insn { const insn_byte_t *next_byte; }; -#define MAX_INSN_SIZE 16 +#define MAX_INSN_SIZE 15 #define X86_MODRM_MOD(modrm) (((modrm) & 0xc0) >> 6) #define X86_MODRM_REG(modrm) (((modrm) & 0x38) >> 3) diff --git a/arch/x86/lib/insn.c b/arch/x86/lib/insn.c index 5ea00dd..8f72b33 100644 --- a/arch/x86/lib/insn.c +++ b/arch/x86/lib/insn.c @@ -52,6 +52,13 @@ */ void insn_init(struct insn *insn, const void *kaddr, int buf_len, int x86_64) { + /* + * Instructions longer than MAX_INSN_SIZE (15 bytes) are invalid + * even if the input buffer is long enough to hold them. + */ + if (buf_len > MAX_INSN_SIZE) + buf_len = MAX_INSN_SIZE; + memset(insn, 0, sizeof(*insn)); insn->kaddr = kaddr; insn->end_kaddr = kaddr + buf_len; |