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authorPu Lehui <pulehui@huawei.com>2024-06-22 03:04:35 +0000
committerDaniel Borkmann <daniel@iogearbox.net>2024-07-01 17:10:46 +0200
commitd1a426171d76b2cdf3dea5d52f6266090e4aa254 (patch)
treea96c498ba0067e8966e1c9cc8ebb9cae0df7c829 /kernel/bpf
parent5b747c23f17d791e08fdf4baa7e14b704625518c (diff)
bpf: Use precise image size for struct_ops trampoline
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
Diffstat (limited to 'kernel/bpf')
-rw-r--r--kernel/bpf/bpf_struct_ops.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/bpf/bpf_struct_ops.c b/kernel/bpf/bpf_struct_ops.c
index a2cf31b14be4..0d515ec57aa5 100644
--- a/kernel/bpf/bpf_struct_ops.c
+++ b/kernel/bpf/bpf_struct_ops.c
@@ -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)