On Tue, Nov 27, 2018 at 11:12:40AM +0800, Chao Yu wrote: > On 2018/11/27 8:22, PanBian wrote: > > On Mon, Nov 26, 2018 at 07:07:08PM +0800, Chao Yu wrote: > >> On 2018/11/26 18:28, PanBian wrote: > >>> On Mon, Nov 26, 2018 at 05:13:53PM +0800, Chao Yu wrote: > >>>> Hi Pan, > >>>> > >>>> On 2018/11/22 18:58, Pan Bian wrote: > >>>>> The function truncate_node frees the page with f2fs_put_page. However, > >>>>> the page index is read after that. So, the patch reads the index before > >>>>> freeing the page. > >>>> > >>>> I notice that you found another use-after-free bug in ext4, out of > >>>> curiosity, I'd like to ask how do you find those bugs? by tool or code > >>>> review? > >>> > >>> I found such bugs by the aid of a tool I wrote recently. I designed a > >>> method > >>> to automatically find paired alloc/free functions. With such functions, I > >>> wrote two checkers, one to check mismatched alloc/free bugs, the other to > >>> check use-after-free and double-free bugs. > >> > >> Excellent! Do you have any plan to open its source or announce it w/ binary > >> to linux kernel developers, I think w/ it we can help to improve kernel's > >> code quality efficiently. > > > > Yes. I am now writing a paper about the method. I will open the source code > > as soon as I complete the paper and some optimizations. > > Cool, if there is any progress, please let f2fs guys know, thank you in > advance. :)
No problem. It's my honor to apply my tool to the Linux kernel. > > Thanks, > _______________________________________________ Linux-f2fs-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
