112 lines
2.9 KiB
Diff
112 lines
2.9 KiB
Diff
From 35ad0133df9b65a4e32f2f07a2a05b387bd79591 Mon Sep 17 00:00:00 2001
|
|
From: Tony Cook <tony@develop-help.com>
|
|
Date: Thu, 3 Jan 2019 10:48:05 +1100
|
|
Subject: [PATCH] (perl #133575) prevent set/longjmp clobbering locals in
|
|
S_fold_constants
|
|
MIME-Version: 1.0
|
|
Content-Type: text/plain; charset=UTF-8
|
|
Content-Transfer-Encoding: 8bit
|
|
|
|
My original approach moved the whole switch into the new function,
|
|
but that was a lot messier, and I don't think it's necessary.
|
|
|
|
pad_swipe() can throw, but only for panics, and in DESTROY if
|
|
refadjust is true, which isn't the case here.
|
|
|
|
CLEAR_ERRSV() might throw if the code called by CALLRUNOPS()
|
|
puts an object that dies in DESTROY in $@, but I think that
|
|
might cause an infinite loop in the original code.
|
|
|
|
Signed-off-by: Petr Písař <ppisar@redhat.com>
|
|
---
|
|
op.c | 32 ++++++++++++++++++++++++--------
|
|
1 file changed, 24 insertions(+), 8 deletions(-)
|
|
|
|
diff --git a/op.c b/op.c
|
|
index 146407ba70..0b46b348cb 100644
|
|
--- a/op.c
|
|
+++ b/op.c
|
|
@@ -5464,15 +5464,34 @@ S_op_integerize(pTHX_ OP *o)
|
|
return o;
|
|
}
|
|
|
|
+/* This function exists solely to provide a scope to limit
|
|
+ setjmp/longjmp() messing with auto variables.
|
|
+ */
|
|
+PERL_STATIC_INLINE int
|
|
+S_fold_constants_eval(pTHX) {
|
|
+ int ret = 0;
|
|
+ dJMPENV;
|
|
+
|
|
+ JMPENV_PUSH(ret);
|
|
+
|
|
+ if (ret == 0) {
|
|
+ CALLRUNOPS(aTHX);
|
|
+ }
|
|
+
|
|
+ JMPENV_POP;
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
static OP *
|
|
S_fold_constants(pTHX_ OP *const o)
|
|
{
|
|
dVAR;
|
|
- OP * volatile curop;
|
|
+ OP *curop;
|
|
OP *newop;
|
|
- volatile I32 type = o->op_type;
|
|
+ I32 type = o->op_type;
|
|
bool is_stringify;
|
|
- SV * volatile sv = NULL;
|
|
+ SV *sv = NULL;
|
|
int ret = 0;
|
|
OP *old_next;
|
|
SV * const oldwarnhook = PL_warnhook;
|
|
@@ -5480,7 +5499,6 @@ S_fold_constants(pTHX_ OP *const o)
|
|
COP not_compiling;
|
|
U8 oldwarn = PL_dowarn;
|
|
I32 old_cxix;
|
|
- dJMPENV;
|
|
|
|
PERL_ARGS_ASSERT_FOLD_CONSTANTS;
|
|
|
|
@@ -5582,15 +5600,15 @@ S_fold_constants(pTHX_ OP *const o)
|
|
assert(IN_PERL_RUNTIME);
|
|
PL_warnhook = PERL_WARNHOOK_FATAL;
|
|
PL_diehook = NULL;
|
|
- JMPENV_PUSH(ret);
|
|
|
|
/* Effective $^W=1. */
|
|
if ( ! (PL_dowarn & G_WARN_ALL_MASK))
|
|
PL_dowarn |= G_WARN_ON;
|
|
|
|
+ ret = S_fold_constants_eval(aTHX);
|
|
+
|
|
switch (ret) {
|
|
case 0:
|
|
- CALLRUNOPS(aTHX);
|
|
sv = *(PL_stack_sp--);
|
|
if (o->op_targ && sv == PAD_SV(o->op_targ)) { /* grab pad temp? */
|
|
pad_swipe(o->op_targ, FALSE);
|
|
@@ -5608,7 +5626,6 @@ S_fold_constants(pTHX_ OP *const o)
|
|
o->op_next = old_next;
|
|
break;
|
|
default:
|
|
- JMPENV_POP;
|
|
/* Don't expect 1 (setjmp failed) or 2 (something called my_exit) */
|
|
PL_warnhook = oldwarnhook;
|
|
PL_diehook = olddiehook;
|
|
@@ -5616,7 +5633,6 @@ S_fold_constants(pTHX_ OP *const o)
|
|
* the stack - eg any nested evals */
|
|
Perl_croak(aTHX_ "panic: fold_constants JMPENV_PUSH returned %d", ret);
|
|
}
|
|
- JMPENV_POP;
|
|
PL_dowarn = oldwarn;
|
|
PL_warnhook = oldwarnhook;
|
|
PL_diehook = olddiehook;
|
|
--
|
|
2.17.2
|
|
|