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Message-ID: <CAJcbSZFw9GhVvNfYi1oHhpintHSzGcHvGjg5LtRViNBPDzLHaA@mail.gmail.com>
Date: Mon, 24 Jul 2017 10:07:09 -0700
From: Thomas Garnier <thgarnie@...gle.com>
To: Russell King <linux@...linux.org.uk>, Thomas Garnier <thgarnie@...gle.com>,
Thomas Gleixner <tglx@...utronix.de>, Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>, Dave Martin <Dave.Martin@....com>,
Chris Metcalf <cmetcalf@...lanox.com>, Pratyush Anand <panand@...hat.com>,
Leonard Crestez <leonard.crestez@....com>
Cc: linux-arm-kernel@...ts.infradead.org, LKML <linux-kernel@...r.kernel.org>,
Kernel Hardening <kernel-hardening@...ts.openwall.com>
Subject: Re: [PATCH 1/3] arm/syscalls: Move address limit check in loop
On Wed, Jul 19, 2017 at 10:58 AM, Thomas Garnier <thgarnie@...gle.com> wrote:
> The work pending loop can call set_fs after addr_limit_user_check
> removed the _TIF_FSCHECK flag. To prevent the infinite loop, move
> the addr_limit_user_check call at the beginning of the loop.
>
> Fixes: 73ac5d6a2b6a ("arm/syscalls: Check address limit on user-mode return")
> Reported-by: Leonard Crestez <leonard.crestez@....com>
> Signed-off-by: Thomas Garnier <thgarnie@...gle.com>
Any comments on this patch set?
> ---
> arch/arm/kernel/signal.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
> index 3a48b54c6405..f4574287d14b 100644
> --- a/arch/arm/kernel/signal.c
> +++ b/arch/arm/kernel/signal.c
> @@ -573,10 +573,10 @@ do_work_pending(struct pt_regs *regs, unsigned int thread_flags, int syscall)
> */
> trace_hardirqs_off();
>
> - /* Check valid user FS if needed */
> - addr_limit_user_check();
> -
> do {
> + /* Check valid user FS if needed */
> + addr_limit_user_check();
> +
> if (likely(thread_flags & _TIF_NEED_RESCHED)) {
> schedule();
> } else {
> --
> 2.14.0.rc0.284.gd933b75aa4-goog
>
--
Thomas
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