[Webkit-unassigned] [Bug 146729] Syscall param sendmsg(msg.msg_iov[0]) points to uninitialised byte(s) in IPC::Connection::sendOutgoingMessage

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Wed Mar 18 18:20:16 PDT 2020


https://bugs.webkit.org/show_bug.cgi?id=146729

--- Comment #9 from Michael Catanzaro <mcatanzaro at gnome.org> ---
(In reply to Michael Catanzaro from comment #5)
> The one that valgrind says originates in
> IPC::Connection::sendOutgoingMessage is less obvious, still trying to figure
> it out.

Guess: a message attachment contains uninitalized memory? The uninitialized memory must be coming from the UnixMessage, and therefore ultimately from the encoder that gets passed to sendOutgoingMessage. If it were a problem with encoder.buffer() then it would be a heap issue rather than a stack issue, so my guess is the message attachment.

Now the problem is going to be tracking it down to a particular message. Not sure how we can do that.

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