Messages in this thread | | | From | Linus Torvalds <> | Date | Tue, 2 Jun 2020 13:43:20 -0700 | Subject | Re: [PATCH RFC] uaccess: user_access_begin_after_access_ok() |
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On Tue, Jun 2, 2020 at 1:33 PM Michael S. Tsirkin <mst@redhat.com> wrote: > > Hmm are you sure we can drop it? access_ok is done in the context > of the process. Access itself in the context of a kernel thread > that borrows the same mm. IIUC if the process can be 32 bit > while the kernel is 64 bit, access_ok in the context of the > kernel thread will not DTRT.
You're historically expected to just "set_fs()" when you do use_mm().
Then we fixed it in commit...
Oh, when I look for it, I notice that it still hasn't gotten merged. It's still pending, see
https://lore.kernel.org/lkml/20200416053158.586887-4-hch@lst.de/
for the current thing.
Linus
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