diff options
| author | Ilya Leoshkevich <iii@linux.ibm.com> | 2021-10-26 04:08:26 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-11-18 16:04:11 +0300 |
| commit | 3925134eff295ff12b2ca0ebd874eb058df5f21b (patch) | |
| tree | 551ec2079703f5afa50c8c56eece7303db5e8c7b /tools/lib | |
| parent | 227efdda51b4eddd10a0a5f29c0dae3eecfd265d (diff) | |
| download | linux-3925134eff295ff12b2ca0ebd874eb058df5f21b.tar.xz | |
libbpf: Fix endianness detection in BPF_CORE_READ_BITFIELD_PROBED()
[ Upstream commit 45f2bebc8079788f62f22d9e8b2819afb1789d7b ]
__BYTE_ORDER is supposed to be defined by a libc, and __BYTE_ORDER__ -
by a compiler. bpf_core_read.h checks __BYTE_ORDER == __LITTLE_ENDIAN,
which is true if neither are defined, leading to incorrect behavior on
big-endian hosts if libc headers are not included, which is often the
case.
Fixes: ee26dade0e3b ("libbpf: Add support for relocatable bitfields")
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20211026010831.748682-2-iii@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'tools/lib')
| -rw-r--r-- | tools/lib/bpf/bpf_core_read.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/tools/lib/bpf/bpf_core_read.h b/tools/lib/bpf/bpf_core_read.h index 4538ed762a20..f05cfc082915 100644 --- a/tools/lib/bpf/bpf_core_read.h +++ b/tools/lib/bpf/bpf_core_read.h @@ -40,7 +40,7 @@ enum bpf_enum_value_kind { #define __CORE_RELO(src, field, info) \ __builtin_preserve_field_info((src)->field, BPF_FIELD_##info) -#if __BYTE_ORDER == __LITTLE_ENDIAN +#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__ #define __CORE_BITFIELD_PROBE_READ(dst, src, fld) \ bpf_probe_read_kernel( \ (void *)dst, \ |