From: Kees Cook <keescook@chromium.org>
To: Mark Rutland <mark.rutland@arm.com>
Cc: linux-hardening@vger.kernel.org,
"Gustavo A. R. Silva" <gustavoars@kernel.org>,
Bill Wendling <morbo@google.com>,
Justin Stitt <justinstitt@google.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 00/82] overflow: Refactor open-coded arithmetic wrap-around
Date: Tue, 23 Jan 2024 13:56:34 -0800 [thread overview]
Message-ID: <202401231355.A94FADCAE@keescook> (raw)
In-Reply-To: <Za-K-3aSBULf4NWE@FVFF77S0Q05N>
On Tue, Jan 23, 2024 at 09:46:35AM +0000, Mark Rutland wrote:
> With that in mind, I note that this patch primarily modifies addition
> operations, but leaves subtraction operations unchanged (even though those
> permit the value to go below the minimum, or above the maximum if a negative
> value is used as the subtrahend).
Right, this was kind of a "first pass" on what I'd found so far.
> Shouldn't we address both at the same time? I'll note that in many places the
> same logic is used for both the add and sub, and can legitimately overflow or
> underflow; I hope that whatever we use to suppress overflow warnings also
> ignores underflow.
>
> [...]
>
> Looking at the diffstat, I think you've missed a few places:
>
> [...]
>
> This misses the include/asm-generic/{atomic,atomic64}.h implementations.
>
> This also misses the include/linux/atomic/atomic-arch-fallback.h
> implementations. Those are generated from the scripts/atomic/fallbacks/*
> templates, and you'll need to adjust at least fetch_add_unless and
> inc_unless_negative. As noted on other patches, my preference is to use
> add_wrap() in those.
> [...]
> This misses lib/atomic64.c.
Thanks! I'll take a closer look at places we can use the helpers on the
atomics.
-Kees
--
Kees Cook
next prev parent reply other threads:[~2024-01-23 21:56 UTC|newest]
Thread overview: 163+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-23 0:26 [PATCH 00/82] overflow: Refactor open-coded arithmetic wrap-around Kees Cook
2024-01-23 0:26 ` [PATCH 01/82] overflow: Expand check_add_overflow() for pointer addition Kees Cook
2024-01-26 22:52 ` Justin Stitt
2024-01-26 22:57 ` Kees Cook
2024-01-23 0:26 ` [PATCH 02/82] overflow: Introduce add_would_overflow() Kees Cook
2024-01-23 8:03 ` Rasmus Villemoes
2024-01-23 21:38 ` Kees Cook
2024-01-23 0:26 ` [PATCH 03/82] overflow: Introduce add_wrap() Kees Cook
2024-01-23 8:14 ` Rasmus Villemoes
2024-01-23 21:51 ` Kees Cook
2024-01-23 9:22 ` Mark Rutland
2024-01-23 21:52 ` Kees Cook
2024-01-23 0:26 ` [PATCH 04/82] docs: deprecated.rst: deprecate open-coded arithmetic wrap-around Kees Cook
2024-01-23 0:26 ` [PATCH 05/82] cocci: Refactor " Kees Cook
2024-01-23 0:26 ` [PATCH 06/82] overflow: Reintroduce signed and unsigned overflow sanitizers Kees Cook
2024-01-23 2:24 ` Miguel Ojeda
2024-01-23 4:45 ` Kees Cook
2024-01-23 11:20 ` Miguel Ojeda
2024-01-23 0:26 ` [PATCH 07/82] overflow: Introduce CONFIG_UBSAN_POINTER_WRAP Kees Cook
2024-01-23 0:26 ` [PATCH 08/82] iov_iter: Avoid wrap-around instrumentation in copy_compat_iovec_from_user Kees Cook
2024-01-23 0:26 ` [PATCH 09/82] select: Avoid wrap-around instrumentation in do_sys_poll() Kees Cook
2024-01-23 18:00 ` Jan Kara
2024-01-23 0:26 ` [PATCH 10/82] locking/atomic/x86: Silence intentional wrapping addition Kees Cook
2024-01-23 9:27 ` Mark Rutland
2024-01-23 21:54 ` Kees Cook
2024-01-23 0:26 ` [PATCH 11/82] arm64: atomics: lse: " Kees Cook
2024-01-23 9:53 ` Mark Rutland
2024-01-23 0:26 ` [PATCH 12/82] ipv4: " Kees Cook
2024-01-23 0:26 ` [PATCH 13/82] btrfs: Refactor intentional wrap-around calculation Kees Cook
2024-01-23 1:45 ` David Sterba
2024-01-23 0:26 ` [PATCH 14/82] smb: client: " Kees Cook
2024-01-23 0:26 ` [PATCH 15/82] dma-buf: " Kees Cook
2024-01-23 0:26 ` [PATCH 16/82] drm/nouveau/mmu: " Kees Cook
2024-01-23 0:26 ` [PATCH 17/82] drm/vc4: " Kees Cook
2024-01-23 0:26 ` [PATCH 18/82] ext4: " Kees Cook
2024-01-23 0:26 ` [PATCH 19/82] fs: " Kees Cook
2024-01-23 18:01 ` Jan Kara
2024-01-23 0:26 ` [PATCH 20/82] fpga: dfl: " Kees Cook
2024-01-23 0:26 ` [PATCH 21/82] drivers/fsi: " Kees Cook
2024-01-23 0:26 ` [PATCH 22/82] x86/sgx: " Kees Cook
2024-01-23 9:15 ` Jarkko Sakkinen
2024-01-23 0:26 ` [PATCH 23/82] KVM: " Kees Cook
2024-01-24 16:25 ` Sean Christopherson
2024-01-23 0:26 ` [PATCH 24/82] KVM: arm64: vgic: " Kees Cook
2024-01-23 10:49 ` Marc Zyngier
2024-01-24 15:13 ` Eric Auger
2024-01-23 0:27 ` [PATCH 25/82] KVM: SVM: " Kees Cook
2024-01-24 16:15 ` Sean Christopherson
2024-01-23 0:27 ` [PATCH 26/82] buildid: " Kees Cook
2024-01-23 0:27 ` [PATCH 27/82] m68k: " Kees Cook
2024-01-23 2:29 ` Liam R. Howlett
2024-01-23 8:13 ` Geert Uytterhoeven
2024-01-23 13:29 ` Eero Tamminen
2024-01-23 13:42 ` Geert Uytterhoeven
2024-01-23 0:27 ` [PATCH 28/82] niu: " Kees Cook
2024-01-23 0:27 ` [PATCH 29/82] rds: " Kees Cook
2024-01-23 0:27 ` [PATCH 30/82] s390/kexec_file: " Kees Cook
2024-01-31 14:22 ` Alexander Gordeev
2024-01-31 14:40 ` Sven Schnelle
2024-01-23 0:27 ` [PATCH 31/82] ARC: dw2 unwind: " Kees Cook
2024-01-23 0:27 ` [PATCH 32/82] vringh: " Kees Cook
2024-01-26 19:31 ` Eugenio Perez Martin
2024-01-26 19:42 ` Kees Cook
2024-01-23 0:27 ` [PATCH 33/82] mm/vmalloc: " Kees Cook
2024-01-30 18:55 ` Lorenzo Stoakes
2024-01-30 19:54 ` Uladzislau Rezki
2024-01-30 21:57 ` Kees Cook
2024-01-31 9:44 ` Uladzislau Rezki
2024-01-23 0:27 ` [PATCH 34/82] ipc: " Kees Cook
2024-01-23 1:07 ` Linus Torvalds
2024-01-23 1:38 ` Kees Cook
2024-01-23 18:06 ` Linus Torvalds
2024-01-23 19:00 ` Kees Cook
2024-01-23 0:27 ` [PATCH 35/82] ACPI: custom_method: Refactor intentional wrap-around test Kees Cook
2024-01-24 19:52 ` Rafael J. Wysocki
2024-01-24 20:16 ` Kees Cook
2024-01-23 0:27 ` [PATCH 36/82] agp: " Kees Cook
2024-01-23 0:27 ` [PATCH 37/82] aio: " Kees Cook
2024-01-23 15:30 ` Christian Brauner
2024-01-23 18:03 ` Jan Kara
2024-01-23 0:27 ` [PATCH 38/82] arm: 3117/1: " Kees Cook
2024-01-23 9:56 ` Mark Rutland
2024-01-23 22:41 ` Kees Cook
2024-01-23 0:27 ` [PATCH 39/82] crypto: " Kees Cook
2024-01-23 0:27 ` [PATCH 40/82] arm64: stacktrace: " Kees Cook
2024-01-23 9:58 ` Mark Rutland
2024-01-23 0:27 ` [PATCH 41/82] wil6210: " Kees Cook
2024-01-23 6:36 ` Kalle Valo
2024-01-23 11:50 ` Kalle Valo
2024-01-23 22:52 ` Kees Cook
2024-01-23 0:27 ` [PATCH 42/82] bcachefs: " Kees Cook
2024-01-23 6:36 ` Kent Overstreet
2024-01-23 0:27 ` [PATCH 43/82] bpf: " Kees Cook
2024-01-23 4:00 ` Yonghong Song
2024-01-23 4:07 ` Kees Cook
2024-01-23 5:13 ` Yonghong Song
2024-01-23 0:27 ` [PATCH 44/82] btrfs: " Kees Cook
2024-01-23 18:00 ` David Sterba
2024-01-23 0:27 ` [PATCH 45/82] cifs: " Kees Cook
2024-01-23 0:27 ` [PATCH 46/82] crypto: " Kees Cook
2024-01-23 3:07 ` Eric Biggers
2024-01-23 3:29 ` Kees Cook
2024-01-23 0:27 ` [PATCH 47/82] dm verity: " Kees Cook
2024-01-30 18:58 ` Mike Snitzer
2024-01-23 0:27 ` [PATCH 48/82] drm/nouveau/mmu: " Kees Cook
2024-01-23 0:27 ` [PATCH 49/82] drm/i915: " Kees Cook
2024-01-23 0:27 ` [PATCH 50/82] drm/vc4: " Kees Cook
2024-01-23 0:27 ` [PATCH 51/82] ext4: " Kees Cook
2024-01-23 0:27 ` [PATCH 52/82] f2fs: " Kees Cook
2024-01-23 0:27 ` [PATCH 53/82] fs: " Kees Cook
2024-01-23 18:02 ` Jan Kara
2024-01-23 0:27 ` [PATCH 54/82] hpfs: " Kees Cook
2024-01-23 0:27 ` [PATCH 55/82] kasan: " Kees Cook
2024-01-25 22:35 ` Andrey Konovalov
2024-01-23 0:27 ` [PATCH 56/82] usercopy: " Kees Cook
2024-01-23 0:27 ` [PATCH 57/82] KVM: arm64: vgic-v3: " Kees Cook
2024-01-23 10:50 ` Marc Zyngier
2024-01-24 15:12 ` Eric Auger
2024-01-23 0:27 ` [PATCH 58/82] s390/mm: " Kees Cook
2024-01-23 0:27 ` [PATCH 59/82] lib/scatterlist: " Kees Cook
2024-01-23 0:27 ` [PATCH 60/82] powerpc: " Kees Cook
2024-02-12 5:38 ` Michael Ellerman
2024-01-23 0:27 ` [PATCH 61/82] scsi: mpt3sas: " Kees Cook
2024-01-23 0:27 ` [PATCH 62/82] mwifiex: pcie: " Kees Cook
2024-01-23 6:36 ` Kalle Valo
2024-01-23 0:27 ` [PATCH 63/82] mm: " Kees Cook
2024-01-23 0:27 ` [PATCH 64/82] netfilter: " Kees Cook
2024-01-23 18:03 ` Florian Westphal
2024-01-23 0:27 ` [PATCH 65/82] nios2: " Kees Cook
2024-01-23 13:15 ` Dinh Nguyen
2024-01-23 0:27 ` [PATCH 66/82] fs/ntfs3: " Kees Cook
2024-01-23 0:27 ` [PATCH 67/82] ocfs2: " Kees Cook
2024-01-23 0:27 ` [PATCH 68/82] PCI: " Kees Cook
2024-01-23 0:27 ` [PATCH 69/82] perf tools: " Kees Cook
2024-01-23 6:21 ` Adrian Hunter
2024-01-23 21:31 ` Kees Cook
2024-01-23 0:27 ` [PATCH 70/82] remoteproc: " Kees Cook
2024-02-06 18:55 ` Bjorn Andersson
2024-01-23 0:27 ` [PATCH 71/82] s390/mm: " Kees Cook
2024-01-23 0:27 ` [PATCH 72/82] scsi: sd_zbc: " Kees Cook
2024-01-23 0:27 ` [PATCH 73/82] sh: " Kees Cook
2024-01-23 7:31 ` John Paul Adrian Glaubitz
2024-01-23 0:27 ` [PATCH 74/82] ARC: dw2 unwind: " Kees Cook
2024-01-23 0:27 ` [PATCH 75/82] timekeeping: " Kees Cook
2024-01-23 1:06 ` John Stultz
2024-01-24 19:34 ` Thomas Gleixner
2024-01-23 0:27 ` [PATCH 76/82] udf: " Kees Cook
2024-01-23 17:14 ` Jan Kara
2024-01-23 0:27 ` [PATCH 77/82] virtio: " Kees Cook
2024-01-26 19:33 ` Eugenio Perez Martin
2024-01-23 0:27 ` [PATCH 78/82] mm/vmalloc: " Kees Cook
2024-01-30 18:56 ` Lorenzo Stoakes
2024-01-23 0:27 ` [PATCH 79/82] staging: vme_user: " Kees Cook
2024-01-23 0:27 ` [PATCH 80/82] xen-netback: " Kees Cook
2024-01-23 7:55 ` Jan Beulich
2024-01-23 21:32 ` Kees Cook
2024-01-23 0:27 ` [PATCH 81/82] lib: zstd: " Kees Cook
2024-01-23 0:27 ` [PATCH 82/82] mqueue: " Kees Cook
2024-01-23 2:22 ` [PATCH 00/82] overflow: Refactor open-coded arithmetic wrap-around Kent Overstreet
2024-01-23 2:51 ` Kees Cook
2024-01-23 9:46 ` Mark Rutland
2024-01-23 21:56 ` Kees Cook [this message]
2024-01-29 6:27 ` Kees Cook
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