mirror/libbpf
1
0
Fork 0
mirror of https://github.com/netdata/libbpf.git synced 2026-04-06 00:29:07 +08:00
Code Issues Packages Projects Releases Wiki Activity

bpf: Add bpf_copy_from_user_str kfunc

Browse Source 
This adds a kfunc wrapper around strncpy_from_user,
which can be called from sleepable BPF programs.

This matches the non-sleepable 'bpf_probe_read_user_str'
helper except it includes an additional 'flags'
param, which allows consumers to clear the entire
destination buffer on success or failure.

Signed-off-by: Jordan Rome <linux@jordanrome.com>
Link: https://lore.kernel.org/r/20240823195101.3621028-1-linux@jordanrome.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Jordan Rome
2024-08-23 12:51:00 -07:00
committed by Andrii Nakryiko
parent 33b22671c2
commit 4bd31a1044
1 changed files with 9 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
include/uapi/linux/bpf.h
View File

@@ -7512,4 +7512,13 @@ struct bpf_iter_num {
__u64 __opaque[1]; __u64 __opaque[1];
} __attribute__((aligned(8))); } __attribute__((aligned(8)));
/*
* Flags to control BPF kfunc behaviour.
* - BPF_F_PAD_ZEROS: Pad destination buffer with zeros. (See the respective
* helper documentation for details.)
*/
enum bpf_kfunc_flags {
BPF_F_PAD_ZEROS = (1ULL << 0),
};
#endif /* _UAPI__LINUX_BPF_H__ */ #endif /* _UAPI__LINUX_BPF_H__ */