mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-11 04:18:39 +08:00
static_call: Add some validation
Verify the text we're about to change is as we expect it to be. Requested-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lore.kernel.org/r/20200818135805.161974981@infradead.org
This commit is contained in:
parent
5b06fd3bb9
commit
6c3fce794e
@ -41,6 +41,26 @@ static void __static_call_transform(void *insn, enum insn_type type, void *func)
|
||||
text_poke_bp(insn, code, size, NULL);
|
||||
}
|
||||
|
||||
static void __static_call_validate(void *insn, bool tail)
|
||||
{
|
||||
u8 opcode = *(u8 *)insn;
|
||||
|
||||
if (tail) {
|
||||
if (opcode == JMP32_INSN_OPCODE ||
|
||||
opcode == RET_INSN_OPCODE)
|
||||
return;
|
||||
} else {
|
||||
if (opcode == CALL_INSN_OPCODE ||
|
||||
!memcmp(insn, ideal_nops[NOP_ATOMIC5], 5))
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* 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);
|
||||
}
|
||||
|
||||
static inline enum insn_type __sc_insn(bool null, bool tail)
|
||||
{
|
||||
/*
|
||||
@ -60,11 +80,15 @@ void arch_static_call_transform(void *site, void *tramp, void *func, bool tail)
|
||||
{
|
||||
mutex_lock(&text_mutex);
|
||||
|
||||
if (tramp)
|
||||
if (tramp) {
|
||||
__static_call_validate(tramp, true);
|
||||
__static_call_transform(tramp, __sc_insn(!func, true), func);
|
||||
}
|
||||
|
||||
if (IS_ENABLED(CONFIG_HAVE_STATIC_CALL_INLINE) && site)
|
||||
if (IS_ENABLED(CONFIG_HAVE_STATIC_CALL_INLINE) && site) {
|
||||
__static_call_validate(site, tail);
|
||||
__static_call_transform(site, __sc_insn(!func, tail), func);
|
||||
}
|
||||
|
||||
mutex_unlock(&text_mutex);
|
||||
}
|
||||
|
Loading…
Reference in New Issue
Block a user