235723 2022-01-27 10:15:21 -0800 Default to 32 bit refcount for CanMakeCheckedPtr 2022-01-28 00:09:04 -0800 1 1 1 Unclassified WebKit Web Template Framework WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=226158 InRadar P2 Normal --- 1 koivisto koivisto benjamin cdumez cmarcelo darin ews-watchlist rniwa oldest_to_newest 1834581 0 koivisto 2022-01-27 10:15:21 -0800 It is currently uint16_t for no good reason. We just hit the first bug caused by overrunning it (in iFC). 1834583 1 koivisto 2022-01-27 10:16:26 -0800 rdar://86602114 1834595 2 450153 koivisto 2022-01-27 10:29:22 -0800 Created attachment 450153 Patch 1834681 3 rniwa 2022-01-27 13:36:39 -0800 I went conservative in size but going with 32-bit is quite reasonable given we also do that in RefCounted. 1834685 4 ews-feeder 2022-01-27 13:38:42 -0800 Committed r288700 (246498@main): <https://commits.webkit.org/246498@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 450153. 1834817 5 koivisto 2022-01-27 22:14:37 -0800 (In reply to Ryosuke Niwa from comment #3) > I went conservative in size but going with 32-bit is quite reasonable given > we also do that in RefCounted. An alternative would have been to just remove ASSERT(m_count) from decrement. 1834834 6 rniwa 2022-01-27 23:25:51 -0800 (In reply to Antti Koivisto from comment #5) > (In reply to Ryosuke Niwa from comment #3) > > I went conservative in size but going with 32-bit is quite reasonable given > > we also do that in RefCounted. > > An alternative would have been to just remove ASSERT(m_count) from decrement. I don't think that would have been quite safe. If m_count had overflowed, then it's also possible for m_count to become 0 every 2^16 decrements and bypass CanMakeCheckedPtrBase::~CanMakeCheckedPtrBase's release assert even when there are outstanding CheckedPtr or CheckedRef to it. If the creation of CanMakeCheckedPtr objects can be influenced by scripts, it's possible for a malicious web page to control how many decrements would happen to m_count to bypass the release assert, thereby triggering UAF down the line. 1834841 7 koivisto 2022-01-27 23:46:53 -0800 Right, that's why I thought this was a better approach. Overrunning 32 bits by allocating CheckedPtrs is probably not possible in practice. 1834844 8 rniwa 2022-01-28 00:09:04 -0800 (In reply to Antti Koivisto from comment #7) > Right, that's why I thought this was a better approach. Overrunning 32 bits > by allocating CheckedPtrs is probably not possible in practice. Right. 450153 2022-01-27 10:29:22 -0800 2022-01-27 14:30:03 -0800 Patch bug-235723-20220127202920.patch text/plain 26952 koivisto U3VidmVyc2lvbiBSZXZpc2lvbjogMjg4Njc0CmRpZmYgLS1naXQgYS9Tb3VyY2UvV1RGL0NoYW5n ZUxvZyBiL1NvdXJjZS9XVEYvQ2hhbmdlTG9nCmluZGV4IDJiNWZmMzg3ZWY4M2U0OThiYzBjMjQw YmZjNjk4ODhmNjkwMDMxZjkuLmUyOWEzM2ZmYmJhZDY0YmNlMDZhMmJiYTQ2Yjc1MzI1ZGZjYmI1 NjcgMTAwNjQ0Ci0tLSBhL1NvdXJjZS9XVEYvQ2hhbmdlTG9nCisrKyBiL1NvdXJjZS9XVEYvQ2hh bmdlTG9nCkBAIC0xLDMgKzEsMjAgQEAKKzIwMjItMDEtMjcgIEFudHRpIEtvaXZpc3RvICA8YW50 dGlAYXBwbGUuY29tPgorCisgICAgICAgIERlZmF1bHQgdG8gMzIgYml0IHJlZmNvdW50IGZvciBD YW5NYWtlQ2hlY2tlZFB0cgorICAgICAgICBodHRwczovL2J1Z3Mud2Via2l0Lm9yZy9zaG93X2J1 Zy5jZ2k/aWQ9MjM1NzIzCisgICAgICAgIHJkYXI6Ly84NjYwMjExNAorCisgICAgICAgIFJldmll d2VkIGJ5IE5PQk9EWSAoT09QUyEpLgorCisgICAgICAgIEl0IGlzIGN1cnJlbnRseSB1aW50MTZf dCBmb3Igbm8gZ29vZCByZWFzb24uIEl0IGlzIG5vIHVucmVhc29uYWJsZSB0byBoYXZlIGFuIG9i amVjdCBiZWluZyByZWZlcmVuY2VkCisgICAgICAgIGJ5IGEgbGFyZ2UgbnVtYmVyIG9mIG90aGVy 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