bpf: Account scratch buffer in bpf_prog_calc_tag

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bpf_prog_calc_tag() copies the instructions into a plain vmalloc() scratch
buffer to blind the map fds before hashing. The buffer scales with the
program, up to ~8MB at the 1M instruction limit, and is allocated on every
program load, but unlike the rest of the load-time scratch memory it is
not charged to the loader's memcg. Use GFP_KERNEL_ACCOUNT to account it
like the other allocations scoped to the verification/load.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20260708211537.371874-5-daniel@iogearbox.net
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

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Daniel Borkmann 2026-07-08 23:15:37 +02:00 • committed by Kumar Kartikeya Dwivedi

parent 42560699a8

commit ff755b6007

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kernel/bpf/core.c

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