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authorKees Cook <keescook@chromium.org>2022-10-26 01:39:35 +0300
committerPaolo Abeni <pabeni@redhat.com>2022-10-27 16:48:19 +0300
commit12d6c1d3a2ad0c199ec57c201cdc71e8e157a232 (patch)
tree3b45dd1b420da8afe177d6ae9bc67e1ef12f735c /net/dsa
parent99c8eb46773e5cfc5d868b35b77b1e2e19f8bec8 (diff)
downloadlinux-12d6c1d3a2ad0c199ec57c201cdc71e8e157a232.tar.xz
skbuff: Proactively round up to kmalloc bucket size
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. This will allow for kernels built with CONFIG_UBSAN_BOUNDS or the coming dynamic bounds checking under CONFIG_FORTIFY_SOURCE to gain back the __alloc_size() hints that were temporarily reverted in commit 93dd04ab0b2b ("slab: remove __alloc_size attribute from __kmalloc_track_caller") Cc: "David S. Miller" <davem@davemloft.net> Cc: Eric Dumazet <edumazet@google.com> Cc: Jakub Kicinski <kuba@kernel.org> Cc: Paolo Abeni <pabeni@redhat.com> Cc: netdev@vger.kernel.org Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Nick Desaulniers <ndesaulniers@google.com> Cc: David Rientjes <rientjes@google.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Link: https://patchwork.kernel.org/project/netdevbpf/patch/20221021234713.you.031-kees@kernel.org/ Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20221025223811.up.360-kees@kernel.org Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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