From: David Laight <David.Laight@ACULAB.COM>
To: 'Will Deacon' <will@kernel.org>, Kees Cook <keescook@chromium.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Elena Reshetova <elena.reshetova@intel.com>,
"x86@kernel.org" <x86@kernel.org>,
"Andy Lutomirski" <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
"Catalin Marinas" <catalin.marinas@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Potapenko <glider@google.com>,
Alexander Popov <alex.popov@linux.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
Jann Horn <jannh@google.com>, Vlastimil Babka <vbabka@suse.cz>,
David Hildenbrand <david@redhat.com>,
Mike Rapoport <rppt@linux.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Jonathan Corbet <corbet@lwn.net>,
Randy Dunlap <rdunlap@infradead.org>,
"kernel-hardening@lists.openwall.com"
<kernel-hardening@lists.openwall.com>,
"linux-hardening@vger.kernel.org"
<linux-hardening@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH v8 3/6] stack: Optionally randomize kernel stack offset each syscall
Date: Thu, 1 Apr 2021 11:15:43 +0000 [thread overview]
Message-ID: <61ae9398a03d4fe7868b68c9026d5998@AcuMS.aculab.com> (raw)
In-Reply-To: <20210401083034.GA8554@willie-the-truck>
From: Will Deacon
> Sent: 01 April 2021 09:31
...
> > +/*
> > + * These macros must be used during syscall entry when interrupts and
> > + * preempt are disabled, and after user registers have been stored to
> > + * the stack.
> > + */
> > +#define add_random_kstack_offset() do { \
> > + if (static_branch_maybe(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT, \
> > + &randomize_kstack_offset)) { \
> > + u32 offset = __this_cpu_read(kstack_offset); \
> > + u8 *ptr = __builtin_alloca(KSTACK_OFFSET_MAX(offset)); \
> > + asm volatile("" : "=m"(*ptr) :: "memory"); \
>
> Using the "m" constraint here is dangerous if you don't actually evaluate it
> inside the asm. For example, if the compiler decides to generate an
> addressing mode relative to the stack but with writeback (autodecrement), then
> the stack pointer will be off by 8 bytes. Can you use "o" instead?
Is it allowed to use such a mode?
It would have to know that the "m" was substituted exactly once.
I think there are quite a few examples with 'strange' uses of memory
asm arguments.
However, in this case, isn't it enough to ensure the address is 'saved'?
So:
asm volatile("" : "=r"(ptr) );
should be enough.
David
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Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
next prev parent reply other threads:[~2021-04-01 17:51 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-30 20:57 [PATCH v8 0/6] " Kees Cook
2021-03-30 20:57 ` [PATCH v8 1/6] jump_label: Provide CONFIG-driven build state defaults Kees Cook
2021-03-30 20:57 ` [PATCH v8 2/6] init_on_alloc: Optimize static branches Kees Cook
2021-03-30 20:57 ` [PATCH v8 3/6] stack: Optionally randomize kernel stack offset each syscall Kees Cook
2021-03-31 7:53 ` Thomas Gleixner
2021-03-31 21:54 ` Kees Cook
2021-03-31 22:38 ` Thomas Gleixner
2021-04-01 6:31 ` Kees Cook
2021-04-01 8:30 ` Will Deacon
2021-04-01 11:15 ` David Laight [this message]
2021-04-01 22:42 ` Kees Cook
2021-03-30 20:57 ` [PATCH v8 4/6] x86/entry: Enable random_kstack_offset support Kees Cook
2021-03-31 7:50 ` Thomas Gleixner
2021-03-30 20:57 ` [PATCH v8 5/6] arm64: entry: " Kees Cook
2021-03-30 20:57 ` [PATCH v8 6/6] lkdtm: Add REPORT_STACK for checking stack offsets Kees Cook
2021-04-01 19:17 ` [PATCH] Where we are for this patch? Roy Yang
2021-04-01 19:48 ` Al Viro
2021-04-01 20:13 ` Theodore Ts'o
2021-04-01 21:46 ` [PATCH v8 0/6] Optionally randomize kernel stack offset each syscall Kees Cook
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