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Groups > linux.kernel > #1464829
| From | Linus Torvalds <torvalds@linux-foundation.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [x86/uaccess] 5b710f34e1: kernel BUG at mm/usercopy.c:75! |
| Date | 2016-08-18 00:00 +0200 |
| Message-ID | <s7h2p-73u-3@gated-at.bofh.it> (permalink) |
| References | <s77Z7-TF-9@gated-at.bofh.it> <s7bJo-3pe-19@gated-at.bofh.it> <s7gSK-6Zu-13@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Wed, Aug 17, 2016 at 2:37 PM, Rik van Riel <riel@redhat.com> wrote:
>
> This particular allocation is through kmalloc, but the
> kernel in question has CONFIG_SLOB=y, and usercopy has
> no code in mm/slob.c
Oh, I didn't notice that.
Maybe we can just say that HARDENING depends on !SLOB for now, and see
if anything else shows up.
Maybe we don't have any code that copies data from (non-kmalloc)
multi-order allocations to user space.
Networking does, but seems to use __GFP_COMP, at least in the one case
I checked (skbuff).
Linus
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Re: [x86/uaccess] 5b710f34e1: kernel BUG at mm/usercopy.c:75! Linus Torvalds <torvalds@linux-foundation.org> - 2016-08-17 18:20 +0200
Re: [x86/uaccess] 5b710f34e1: kernel BUG at mm/usercopy.c:75! Kees Cook <keescook@chromium.org> - 2016-08-17 23:30 +0200
Re: [x86/uaccess] 5b710f34e1: kernel BUG at mm/usercopy.c:75! Kees Cook <keescook@chromium.org> - 2016-08-17 23:40 +0200
Re: [x86/uaccess] 5b710f34e1: kernel BUG at mm/usercopy.c:75! Linus Torvalds <torvalds@linux-foundation.org> - 2016-08-17 23:40 +0200
Re: [x86/uaccess] 5b710f34e1: kernel BUG at mm/usercopy.c:75! Rik van Riel <riel@redhat.com> - 2016-08-17 23:50 +0200
Re: [x86/uaccess] 5b710f34e1: kernel BUG at mm/usercopy.c:75! Linus Torvalds <torvalds@linux-foundation.org> - 2016-08-18 00:00 +0200
Re: [x86/uaccess] 5b710f34e1: kernel BUG at mm/usercopy.c:75! Kees Cook <keescook@chromium.org> - 2016-08-18 00:00 +0200
Re: [x86/uaccess] 5b710f34e1: kernel BUG at mm/usercopy.c:75! Linus Torvalds <torvalds@linux-foundation.org> - 2016-08-18 00:00 +0200
Re: [x86/uaccess] 5b710f34e1: kernel BUG at mm/usercopy.c:75! Kees Cook <keescook@chromium.org> - 2016-08-18 00:00 +0200
Re: [x86/uaccess] 5b710f34e1: kernel BUG at mm/usercopy.c:75! Kees Cook <keescook@chromium.org> - 2016-08-18 00:00 +0200
Re: [x86/uaccess] 5b710f34e1: kernel BUG at mm/usercopy.c:75! Linus Torvalds <torvalds@linux-foundation.org> - 2016-08-18 00:00 +0200
Re: [x86/uaccess] 5b710f34e1: kernel BUG at mm/usercopy.c:75! Kees Cook <keescook@chromium.org> - 2016-08-18 00:00 +0200
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