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Bug 706057: Fix use-after-free in getOwnPropertyDescriptor.

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getOwnPropertyDescriptor should create the descriptor object by
using [[DefineOwnProperty]], and not by looking through the prototype
chain where it may invoke getters and setters on the Object.prototype.

If there exists an Object.prototype.get property with a setter, that method is
invoked when it shouldn't. A malicious getter here can delete the property
currently being processed in getOwnPropertyDescriptor, and we'll end up
with a use-after-free bug.

Avoid this problem by following the spec and use js_defproperty rather than
js_setproperty to define own properties in getOwnPropertyDescriptor and
related functions.
This commit is contained in:
Tor Andersson
2022-11-07 12:52:05 +01:00
parent bf4ac94207
commit edb50ad66f
1 changed files with 7 additions and 7 deletions
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14
jsobject.c
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@@ -134,25 +134,25 @@ static void O_getOwnPropertyDescriptor(js_State *J)
js_newobject(J);
if (!ref->getter && !ref->setter) {
js_pushvalue(J, ref->value);
js_setproperty(J, -2, "value");
js_defproperty(J, -2, "value", 0);
js_pushboolean(J, !(ref->atts & JS_READONLY));
js_setproperty(J, -2, "writable");
js_defproperty(J, -2, "writable", 0);
} else {
if (ref->getter)
js_pushobject(J, ref->getter);
else
js_pushundefined(J);
js_setproperty(J, -2, "get");
js_defproperty(J, -2, "get", 0);
if (ref->setter)
js_pushobject(J, ref->setter);
else
js_pushundefined(J);
js_setproperty(J, -2, "set");
js_defproperty(J, -2, "set", 0);
}
js_pushboolean(J, !(ref->atts & JS_DONTENUM));
js_setproperty(J, -2, "enumerable");
js_defproperty(J, -2, "enumerable", 0);
js_pushboolean(J, !(ref->atts & JS_DONTCONF));
js_setproperty(J, -2, "configurable");
js_defproperty(J, -2, "configurable", 0);
}
}
@@ -248,7 +248,7 @@ static void ToPropertyDescriptor(js_State *J, js_Object *obj, const char *name,
}
if (js_hasproperty(J, -1, "value")) {
hasvalue = 1;
js_setproperty(J, -3, name);
js_defproperty(J, -3, name, 0);
}
if (!writable) atts |= JS_READONLY;