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bpf: Use precise image size for struct_ops trampoline

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For trampoline using bpf_prog_pack, we need to generate a rw_image
buffer with size of (image_end - image). For regular trampoline, we use
the precise image size generated by arch_bpf_trampoline_size to allocate
rw_image. But for struct_ops trampoline, we allocate rw_image directly
using close to PAGE_SIZE size. We do not need to allocate for that much,
as the patch size is usually much smaller than PAGE_SIZE. Let's use
precise image size for it too.

Signed-off-by: Pu Lehui <pulehui@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Tested-by: Björn Töpel <bjorn@rivosinc.com> #riscv
Acked-by: Song Liu <song@kernel.org>
Link: https://lore.kernel.org/bpf/20240622030437.3973492-2-pulehui@huaweicloud.com
This commit is contained in:
Pu Lehui 2024-06-22 03:04:35 +00:00 committed by Daniel Borkmann
parent 5b747c23f1
commit d1a426171d
1 changed files with 1 additions and 1 deletions
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2
kernel/bpf/bpf_struct_ops.c
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@ -573,7 +573,7 @@ int bpf_struct_ops_prepare_trampoline(struct bpf_tramp_links *tlinks,
}
size = arch_prepare_bpf_trampoline(NULL, image + image_off,
image + PAGE_SIZE,
image + image_off + size,
model, flags, tlinks, stub_func);
if (size <= 0) {
if (image != *_image)