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| author | Leon Hwang <leon.hwang@linux.dev> | 2026-05-12 23:31:50 +0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2026-05-12 12:44:38 -0700 |
| commit | f28771c0691bcb7f477a0f35550b17b88c32dea8 (patch) | |
| tree | 8b93e22b0cf63cdb7bee4a5d5fcacf30132e804c /include | |
| parent | 25bb05dd06ccffd209c26465f84851f1fd344c8c (diff) | |
| download | linux-next-f28771c0691bcb7f477a0f35550b17b88c32dea8.tar.gz linux-next-f28771c0691bcb7f477a0f35550b17b88c32dea8.zip | |
bpf: Extend BPF syscall with common attributes support
Add generic BPF syscall support for passing common attributes.
The initial set of common attributes includes:
1. 'log_buf': User-provided buffer for storing logs.
2. 'log_size': Size of the log buffer.
3. 'log_level': Log verbosity level.
4. 'log_true_size': Actual log size reported by kernel.
The common-attribute pointer and its size are passed as the 4th and 5th
syscall arguments. A new command bit, 'BPF_COMMON_ATTRS' ('1 << 16'),
indicates that common attributes are supplied.
This commit adds syscall and uapi plumbing. Command-specific handling is
added in follow-up patches.
Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Link: https://lore.kernel.org/r/20260512153157.28382-2-leon.hwang@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/syscalls.h | 3 | ||||
| -rw-r--r-- | include/uapi/linux/bpf.h | 8 |
2 files changed, 10 insertions, 1 deletions
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index f5639d5ac331..50055ab73649 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -936,7 +936,8 @@ asmlinkage long sys_seccomp(unsigned int op, unsigned int flags, asmlinkage long sys_getrandom(char __user *buf, size_t count, unsigned int flags); asmlinkage long sys_memfd_create(const char __user *uname_ptr, unsigned int flags); -asmlinkage long sys_bpf(int cmd, union bpf_attr __user *attr, unsigned int size); +asmlinkage long sys_bpf(int cmd, union bpf_attr __user *attr, unsigned int size, + struct bpf_common_attr __user *attr_common, unsigned int size_common); asmlinkage long sys_execveat(int dfd, const char __user *filename, const char __user *const __user *argv, const char __user *const __user *envp, int flags); diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 552bc5d9afbd..aec171ccb6ef 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -994,6 +994,7 @@ enum bpf_cmd { BPF_PROG_STREAM_READ_BY_FD, BPF_PROG_ASSOC_STRUCT_OPS, __MAX_BPF_CMD, + BPF_COMMON_ATTRS = 1 << 16, /* Indicate carrying syscall common attrs. */ }; enum bpf_map_type { @@ -1500,6 +1501,13 @@ struct bpf_stack_build_id { }; }; +struct bpf_common_attr { + __aligned_u64 log_buf; + __u32 log_size; + __u32 log_level; + __u32 log_true_size; +}; + #define BPF_OBJ_NAME_LEN 16U enum { |