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| author | Andrii Nakryiko <andrii@kernel.org> | 2024-01-26 14:09:44 -0800 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2024-01-29 16:17:44 +0100 |
| commit | ad57654053805bf9a62602aaec74cc78edb6f235 (patch) | |
| tree | d6f66e87082111583b271b5dff78a22745acb1c4 /tools/lib/bpf | |
| parent | 29788f39a4171dd48a6d19eb78cf2ab168c4349a (diff) | |
| download | linux-ad57654053805bf9a62602aaec74cc78edb6f235.tar.gz linux-ad57654053805bf9a62602aaec74cc78edb6f235.tar.bz2 linux-ad57654053805bf9a62602aaec74cc78edb6f235.zip | |
libbpf: Fix faccessat() usage on Android
Android implementation of libc errors out with -EINVAL in faccessat() if
passed AT_EACCESS ([0]), this leads to ridiculous issue with libbpf
refusing to load /sys/kernel/btf/vmlinux on Androids ([1]). Fix by
detecting Android and redefining AT_EACCESS to 0, it's equivalent on
Android.
[0] https://android.googlesource.com/platform/bionic/+/refs/heads/android13-release/libc/bionic/faccessat.cpp#50
[1] https://github.com/libbpf/libbpf-bootstrap/issues/250#issuecomment-1911324250
Fixes: 6a4ab8869d0b ("libbpf: Fix the case of running as non-root with capabilities")
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/bpf/20240126220944.2497665-1-andrii@kernel.org
Diffstat (limited to 'tools/lib/bpf')
| -rw-r--r-- | tools/lib/bpf/libbpf_internal.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/tools/lib/bpf/libbpf_internal.h b/tools/lib/bpf/libbpf_internal.h index 930cc9616527..5b30f3b67a02 100644 --- a/tools/lib/bpf/libbpf_internal.h +++ b/tools/lib/bpf/libbpf_internal.h @@ -19,6 +19,20 @@ #include <libelf.h> #include "relo_core.h" +/* Android's libc doesn't support AT_EACCESS in faccessat() implementation + * ([0]), and just returns -EINVAL even if file exists and is accessible. + * See [1] for issues caused by this. + * + * So just redefine it to 0 on Android. + * + * [0] https://android.googlesource.com/platform/bionic/+/refs/heads/android13-release/libc/bionic/faccessat.cpp#50 + * [1] https://github.com/libbpf/libbpf-bootstrap/issues/250#issuecomment-1911324250 + */ +#ifdef __ANDROID__ +#undef AT_EACCESS +#define AT_EACCESS 0 +#endif + /* make sure libbpf doesn't use kernel-only integer typedefs */ #pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64 |