From: Peter Zijlstra <peterz@infradead.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Holger Hoffstätte" <holger@applied-asynchrony.com>,
"Qi Zheng" <zhengqi.arch@bytedance.com>,
"Kees Cook" <keescook@chromium.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Justin Forbes" <jmforbes@linuxtx.org>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Guenter Roeck" <linux@roeck-us.net>,
"Shuah Khan" <shuah@kernel.org>,
patches@kernelci.org, lkft-triage@lists.linaro.org,
"Pavel Machek" <pavel@denx.de>,
"Jon Hunter" <jonathanh@nvidia.com>,
"Florian Fainelli" <f.fainelli@gmail.com>,
stable <stable@vger.kernel.org>,
"Josh Poimboeuf" <jpoimboe@redhat.com>
Subject: Re: [PATCH 5.15 000/923] 5.15.3-rc3 review
Date: Thu, 18 Nov 2021 11:12:54 +0100 [thread overview]
Message-ID: <YZYnJi0GcxOH16eF@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <YZYfYOcqNqOyZ8Yo@hirez.programming.kicks-ass.net>
On Thu, Nov 18, 2021 at 10:39:44AM +0100, Peter Zijlstra wrote:
> @@ -396,22 +416,27 @@ static bool deref_stack_iret_regs(struct unwind_state *state, unsigned long addr
> static bool get_reg(struct unwind_state *state, unsigned int reg_off,
> unsigned long *val)
> {
> - unsigned int reg = reg_off/8;
> -
> if (!state->regs)
> return false;
>
> + pagefault_disable();
> if (state->full_regs) {
> - *val = READ_ONCE_NOCHECK(((unsigned long *)state->regs)[reg]);
> + __get_kernel_nofault(val, (void *)state->regs + reg_off, unsigned long, Efault);
> + pagefault_enable();
> return true;
> }
>
> if (state->prev_regs) {
> - *val = READ_ONCE_NOCHECK(((unsigned long *)state->prev_regs)[reg]);
> + __get_kernel_nofault(val, (void *)state->regs + reg_off, unsigned long, Efault);
^^^ prev_regs
> + pagefault_enable();
> return true;
> }
>
> return false;
> +
> +Efault:
> + pagefault_enable();
> + return false;
> }
next prev parent reply other threads:[~2021-11-18 10:17 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-17 10:19 [PATCH 5.15 000/923] 5.15.3-rc3 review Greg Kroah-Hartman
2021-11-17 13:37 ` Fox Chen
2021-11-17 14:13 ` Guenter Roeck
2021-11-17 14:43 ` Greg Kroah-Hartman
2021-11-17 14:54 ` Guenter Roeck
2021-11-17 17:34 ` Jon Hunter
2021-11-17 18:51 ` Florian Fainelli
2021-11-17 20:25 ` Holger Kiehl
2021-11-18 8:14 ` Greg Kroah-Hartman
2021-11-18 14:08 ` Holger Kiehl
2021-11-18 17:08 ` Greg Kroah-Hartman
2021-11-17 20:35 ` Guenter Roeck
2021-11-17 21:32 ` Justin Forbes
2021-11-17 23:32 ` Holger Hoffstätte
2021-11-17 23:50 ` Linus Torvalds
2021-11-18 0:16 ` Kees Cook
2021-11-18 6:26 ` Guenter Roeck
2021-11-18 8:14 ` Greg Kroah-Hartman
2021-11-18 8:12 ` Greg Kroah-Hartman
2021-11-18 17:17 ` Kees Cook
2021-11-18 8:06 ` Peter Zijlstra
2021-11-18 8:18 ` Peter Zijlstra
2021-11-18 9:39 ` Peter Zijlstra
2021-11-18 10:12 ` Peter Zijlstra [this message]
2021-11-18 12:11 ` Peter Zijlstra
2021-11-19 2:04 ` Josh Poimboeuf
2021-11-19 9:29 ` [PATCH] x86: Pin task-stack in __get_wchan() Peter Zijlstra
2021-11-19 10:02 ` Qi Zheng
2021-11-19 10:22 ` Peter Zijlstra
2021-11-19 10:26 ` Qi Zheng
2021-11-19 18:16 ` Linus Torvalds
2021-11-19 18:35 ` Josh Poimboeuf
2021-11-22 9:32 ` Peter Zijlstra
2021-11-22 16:14 ` Josh Poimboeuf
2021-11-18 5:45 ` [PATCH 5.15 000/923] 5.15.3-rc3 review Naresh Kamboju
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