Re: [PATCH 04/12] btrfs: send: Proactively round up to kmalloc bucket size

[PATCH 00/12] slab: Introduce kmalloc_size_roundup() · Kees Cook <hidden> · 2022-09-22
[PATCH 02/12] skbuff: Proactively round up to kmalloc bucket size · Kees Cook <hidden> · 2022-09-22
Re: [PATCH 02/12] skbuff: Proactively round up to kmalloc bucket size · Jakub Kicinski <kuba@kernel.org> · 2022-09-22
[PATCH 04/12] btrfs: send: Proactively round up to kmalloc bucket size · Kees Cook <hidden> · 2022-09-22
Re: [PATCH 04/12] btrfs: send: Proactively round up to kmalloc bucket size · David Sterba <hidden> · 2022-09-22
[PATCH 01/12] slab: Introduce kmalloc_size_roundup() · Kees Cook <hidden> · 2022-09-22
Re: [PATCH 01/12] slab: Introduce kmalloc_size_roundup() · Hyeonggon Yoo <hidden> · 2022-09-22
Re: [PATCH 01/12] slab: Introduce kmalloc_size_roundup() · Feng Tang <hidden> · 2022-09-23
Re: [PATCH 01/12] slab: Introduce kmalloc_size_roundup() · Kees Cook <hidden> · 2022-09-23
[PATCH 03/12] net: ipa: Proactively round up to kmalloc bucket size · Kees Cook <hidden> · 2022-09-22
Re: [PATCH 03/12] net: ipa: Proactively round up to kmalloc bucket size · Alex Elder <hidden> · 2022-09-22
Re: [PATCH 03/12] net: ipa: Proactively round up to kmalloc bucket size · Kees Cook <hidden> · 2022-09-22
[PATCH 07/12] igb: Proactively round up to kmalloc bucket size · Kees Cook <hidden> · 2022-09-22
RE: [PATCH 07/12] igb: Proactively round up to kmalloc bucket size · Ruhl, Michael J <hidden> · 2022-09-22
Re: [PATCH 07/12] igb: Proactively round up to kmalloc bucket size · Kees Cook <hidden> · 2022-09-22
[PATCH 05/12] dma-buf: Proactively round up to kmalloc bucket size · Kees Cook <hidden> · 2022-09-22
[PATCH 06/12] coredump: Proactively round up to kmalloc bucket size · Kees Cook <hidden> · 2022-09-22
[PATCH 09/12] x86/microcode/AMD: Track patch allocation size explicitly · Kees Cook <hidden> · 2022-09-22
[PATCH 08/12] openvswitch: Proactively round up to kmalloc bucket size · Kees Cook <hidden> · 2022-09-22
[PATCH 10/12] iwlwifi: Track scan_cmd allocation size explicitly · Kees Cook <hidden> · 2022-09-22
[PATCH 11/12] slab: Remove __malloc attribute from realloc functions · Kees Cook <hidden> · 2022-09-22
Re: [PATCH 11/12] slab: Remove __malloc attribute from realloc functions · Miguel Ojeda <hidden> · 2022-09-22
Re: [PATCH 11/12] slab: Remove __malloc attribute from realloc functions · Kees Cook <hidden> · 2022-09-22
Re: [PATCH 11/12] slab: Remove __malloc attribute from realloc functions · Miguel Ojeda <hidden> · 2022-09-22
[PATCH 12/12] slab: Restore __alloc_size attribute to __kmalloc_track_caller · Kees Cook <hidden> · 2022-09-22
Re: [PATCH 00/12] slab: Introduce kmalloc_size_roundup() · Christian König <christian.koenig@amd.com> · 2022-09-22
Re: [PATCH 00/12] slab: Introduce kmalloc_size_roundup() · Kees Cook <hidden> · 2022-09-22
Re: [PATCH 00/12] slab: Introduce kmalloc_size_roundup() · Vlastimil Babka <hidden> · 2022-09-22
Re: [PATCH 00/12] slab: Introduce kmalloc_size_roundup() · Kees Cook <hidden> · 2022-09-22
Re: [PATCH 00/12] slab: Introduce kmalloc_size_roundup() · Vlastimil Babka <hidden> · 2022-09-23

From: David Sterba <hidden>
Date: 2022-09-22 13:36:48
Also in: dri-devel, intel-wired-lan, linux-btrfs, linux-fsdevel, linux-hardening, linux-media, linux-mm, linux-wireless, lkml, llvm

On Wed, Sep 21, 2022 at 08:10:05PM -0700, Kees Cook wrote:

Instead of discovering the kmalloc bucket size _after_ allocation, round
up proactively so the allocation is explicitly made for the full size,
allowing the compiler to correctly reason about the resulting size of
the buffer through the existing __alloc_size() hint.

Cc: linux-btrfs@vger.kernel.org
Signed-off-by: Kees Cook <redacted>

Acked-by: David Sterba <dsterba@suse.com>

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