Messages in this thread | | | From | Alexey Dobriyan <> | Date | Fri, 21 Oct 2016 16:44:03 +0300 | Subject | Re: + proc-fix-null-dereference-when-reading-proc-pid-auxv.patch added to -mm tree |
| |
On Fri, Oct 21, 2016 at 6:13 AM, <akpm@linux-foundation.org> wrote:
> Reading auxv of any kernel thread results in NULL pointer dereferencing in > auxv_read() where mm can be NULL. Fix that by checking for NULL mm and > bailing out early. This is also the original behavior changed by recent > commit c5317167854e ("proc: switch auxv to use of __mem_open()").
> --- a/fs/proc/base.c~proc-fix-null-dereference-when-reading-proc-pid-auxv > +++ a/fs/proc/base.c > @@ -1014,6 +1014,9 @@ static ssize_t auxv_read(struct file *fi > { > struct mm_struct *mm = file->private_data; > unsigned int nwords = 0; > + > + if (!mm) > + return 0;
Rhetorical question: who wrote such clever __mem_open() ?
| |