CVE-2019-6208 (Jann Horn of Google Project Zero) may be described in the pictures. I didn't find this by binary diff, I find this by bug collision :-( :-( :-(pic.twitter.com/lOGAgNwwrB
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CVE-2019-6208 (Jann Horn of Google Project Zero) may be described in the pictures. I didn't find this by binary diff, I find this by bug collision :-( :-( :-(pic.twitter.com/lOGAgNwwrB
Oh, then that’s my mistake. This uninitialized stack memory bug was fixed in 10.14.3, and the only CVE describing kernel memory leak is your CVE, that’s why I thought my bug conflicted with yours.
No compiler option to auto-initialize stack variables?
I don't know the accurate answer. Maybe some do that(e.g. -finit-local-zero under some gcc) while others don't. On the other side, C standard says the local variable has an uninitialized value, you should zero it by yourself.
@halvarflake do you know which compilers do and do not, or 20 years after your talk no compilers still think it was a good idea?
Compilers generally don't do it by default because it goes against the philosophy of "do not pay for something you do not use"; and for large stack frames, it *is* expensive.
So in most of the cases, you'd just get a warning at compile time for an initialized variable or not even? I know Visual Studio gives you a warning/error for it.
It only does if it can tell the variable isn't initialized. Remember that compilers look at *compilation units*, so if you pass a pointer to the local variable to a subfunction, the compiler can't tell if that subfunc always initializes.
Jann Horn Retweeted Joseph Bialek
actually, apple's @jfbastien recently added support for autoinitializing all stack variables to clang: https://mobile.twitter.com/jfbastien/status/1074897343990816768 …
MSVC, too, for kernel code:https://mobile.twitter.com/JosephBialek/status/1062774315098112001 …
Jann Horn added,
Maybe Apple fixed my bug in 10.14.3 in this way, I will check it after Apple releases source code
Which bug? 
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