Re: [PATCH 09/10] riscv: fix livelock in uaccess
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- To: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
- Subject: Re: [PATCH 09/10] riscv: fix livelock in uaccess
- From: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
- Date: Tue, 7 Feb 2023 17:11:40 +0100
- Cc: linux-arch@xxxxxxxxxxxxxxx, linux-alpha@xxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, linux-hexagon@xxxxxxxxxxxxxxx, linux-m68k@xxxxxxxxxxxxxxx, Michal Simek <monstr@xxxxxxxxx>, Dinh Nguyen <dinguyen@xxxxxxxxxx>, openrisc@xxxxxxxxxxxxxxxxxxxx, linux-parisc@xxxxxxxxxxxxxxx, linux-riscv@xxxxxxxxxxxxxxxxxxx, sparclinux@xxxxxxxxxxxxxxx, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
- In-reply-to: <Y9l02DvS6CYThTEG@ZenIV>
- References: <Y9lz6yk113LmC9SI@ZenIV> <Y9l02DvS6CYThTEG@ZenIV>
On Tue, Jan 31, 2023 at 9:07 PM Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote:
> riscv equivalent of 26178ec11ef3 "x86: mm: consolidate VM_FAULT_RETRY handling"
> If e.g. get_user() triggers a page fault and a fatal signal is caught, we might
> end up with handle_mm_fault() returning VM_FAULT_RETRY and not doing anything
> to page tables. In such case we must *not* return to the faulting insn -
> that would repeat the entire thing without making any progress; what we need
> instead is to treat that as failed (user) memory access.
>
> Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Tested-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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