提交 1ffa11ab 编写于 作者: H Heiko Carstens 提交者: Martin Schwidefsky

s390/kprobes: allow kprobes only on known instructions

Since we have an in-kernel disassembler we can make sure that
there won't be any kprobes set on random data.
Signed-off-by: NHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>
上级 a882b3b0
......@@ -42,5 +42,11 @@ static inline int insn_length(unsigned char code)
void show_code(struct pt_regs *regs);
void print_fn_code(unsigned char *code, unsigned long len);
int insn_to_mnemonic(unsigned char *instruction, char *buf, unsigned int len);
struct s390_insn *find_insn(unsigned char *code);
static inline int is_known_insn(unsigned char *code)
{
return !!find_insn(code);
}
#endif /* __ASM_S390_DIS_H__ */
......@@ -1586,7 +1586,7 @@ static unsigned int extract_operand(unsigned char *code,
return val;
}
static struct s390_insn *find_insn(unsigned char *code)
struct s390_insn *find_insn(unsigned char *code)
{
unsigned char opfrag = code[1];
unsigned char opmask;
......
......@@ -60,6 +60,8 @@ struct kprobe_insn_cache kprobe_dmainsn_slots = {
static int __kprobes is_prohibited_opcode(kprobe_opcode_t *insn)
{
if (!is_known_insn((unsigned char *)insn))
return -EINVAL;
switch (insn[0] >> 8) {
case 0x0c: /* bassm */
case 0x0b: /* bsm */
......
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