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BACKPORT: bpf: Add file mode configuration into bpf maps

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Introduce the map read/write flags to the eBPF syscalls that returns the
map fd. The flags is used to set up the file mode when construct a new
file descriptor for bpf maps. To not break the backward capability, the
f_flags is set to O_RDWR if the flag passed by syscall is 0. Otherwise
it should be O_RDONLY or O_WRONLY. When the userspace want to modify or
read the map content, it will check the file mode to see if it is
allowed to make the change.

Signed-off-by: Chenbo Feng <fengc@google.com>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

Deleted the file mode configuration code in unsupported map type and
removed the file mode check in non-existing helper functions.
(cherry-pick from net-next: 6e71b04a82)
Bug: 30950746

Change-Id: Icfad20f1abb77f91068d244fb0d87fa40824dd1b
This commit is contained in:
Chenbo Feng
2017-10-18 13:00:22 -07:00
parent e0907557ef
commit 4672ded3ec
7 changed files with 100 additions and 17 deletions
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5
include/uapi/linux/bpf.h
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@@ -124,6 +124,10 @@ enum bpf_attach_type {
#define BPF_F_NO_PREALLOC (1U << 0)
/* Flags for accessing BPF object */
#define BPF_F_RDONLY (1U << 3)
#define BPF_F_WRONLY (1U << 4)
union bpf_attr {
struct { /* anonymous struct used by BPF_MAP_CREATE command */
__u32 map_type; /* one of enum bpf_map_type */
@@ -157,6 +161,7 @@ union bpf_attr {
struct { /* anonymous struct used by BPF_OBJ_* commands */
__aligned_u64 pathname;
__u32 bpf_fd;
__u32 file_flags;
};
struct { /* anonymous struct used by BPF_PROG_ATTACH/DETACH commands */