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| author |  Hou Tao <houtao1@huawei.com>
| 2021-12-31 23:10:18 +0800 |
|---|---|---|
| committer |  Daniel Borkmann <daniel@iogearbox.net>
| 2022-01-05 20:43:08 +0100 |
| commit | e4a41c2c1fa916547e63440c73a51a5eb06247af (patch) | |
| tree | 4ed4f82750c7d3110e15fb8960737bc66ecc0b1a /net/ipv4/tcp_bpf.c | |
| parent | bpf/selftests: Fix namespace mount setup in tc_redirect (diff) | |
| download | linux-e4a41c2c1fa916547e63440c73a51a5eb06247af.tar.gz linux-e4a41c2c1fa916547e63440c73a51a5eb06247af.tar.bz2 linux-e4a41c2c1fa916547e63440c73a51a5eb06247af.zip | |
bpf, arm64: Use emit_addr_mov_i64() for BPF_PSEUDO_FUNC
The following error is reported when running "./test_progs -t for_each"
under arm64:
bpf_jit: multi-func JIT bug 58 != 56
[...]
JIT doesn't support bpf-to-bpf calls
The root cause is the size of BPF_PSEUDO_FUNC instruction increases
from 2 to 3 after the address of called bpf-function is settled and
there are two bpf-to-bpf calls in test_pkt_access. The generated
instructions are shown below:
0x48: 21 00 C0 D2 movz x1, #0x1, lsl #32
0x4c: 21 00 80 F2 movk x1, #0x1
0x48: E1 3F C0 92 movn x1, #0x1ff, lsl #32
0x4c: 41 FE A2 F2 movk x1, #0x17f2, lsl #16
0x50: 81 70 9F F2 movk x1, #0xfb84
Fixing it by using emit_addr_mov_i64() for BPF_PSEUDO_FUNC, so
the size of jited image will not change.
Fixes: 69c087ba6225 ("bpf: Add bpf_for_each_map_elem() helper")
Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20211231151018.3781550-1-houtao1@huawei.com
Diffstat (limited to 'net/ipv4/tcp_bpf.c')
0 files changed, 0 insertions, 0 deletions