diff options
Diffstat (limited to 'arch/x86/kernel/static_call.c')
| -rw-r--r-- | arch/x86/kernel/static_call.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/arch/x86/kernel/static_call.c b/arch/x86/kernel/static_call.c index ea028e736831..9c407a33a774 100644 --- a/arch/x86/kernel/static_call.c +++ b/arch/x86/kernel/static_call.c @@ -56,10 +56,15 @@ static void __ref __static_call_transform(void *insn, enum insn_type type, void text_poke_bp(insn, code, size, emulate); } -static void __static_call_validate(void *insn, bool tail) +static void __static_call_validate(void *insn, bool tail, bool tramp) { u8 opcode = *(u8 *)insn; + if (tramp && memcmp(insn+5, "SCT", 3)) { + pr_err("trampoline signature fail"); + BUG(); + } + if (tail) { if (opcode == JMP32_INSN_OPCODE || opcode == RET_INSN_OPCODE) @@ -74,7 +79,8 @@ static void __static_call_validate(void *insn, bool tail) /* * If we ever trigger this, our text is corrupt, we'll probably not live long. */ - WARN_ONCE(1, "unexpected static_call insn opcode 0x%x at %pS\n", opcode, insn); + pr_err("unexpected static_call insn opcode 0x%x at %pS\n", opcode, insn); + BUG(); } static inline enum insn_type __sc_insn(bool null, bool tail) @@ -97,12 +103,12 @@ void arch_static_call_transform(void *site, void *tramp, void *func, bool tail) mutex_lock(&text_mutex); if (tramp) { - __static_call_validate(tramp, true); + __static_call_validate(tramp, true, true); __static_call_transform(tramp, __sc_insn(!func, true), func); } if (IS_ENABLED(CONFIG_HAVE_STATIC_CALL_INLINE) && site) { - __static_call_validate(site, tail); + __static_call_validate(site, tail, false); __static_call_transform(site, __sc_insn(!func, tail), func); } |