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Revert "bpf: Emit audit messages upon successful prog load and unload"

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This commit reverts commit 91e6015b08 ("bpf: Emit audit messages
upon successful prog load and unload") and its follow up commit
7599a896f2 ("audit: Move audit_log_task declaration under
CONFIG_AUDITSYSCALL") as requested by Paul Moore. The change needs
close review on linux-audit, tests etc.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
This commit is contained in:
Jakub Kicinski 2019-11-23 09:54:58 -08:00
parent 8dcdc9524c
commit 84bb46cd62
4 changed files with 1 additions and 38 deletions
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5
include/linux/audit.h
View File

@ -358,8 +358,6 @@ static inline void audit_ptrace(struct task_struct *t)
__audit_ptrace(t);
}
extern void audit_log_task(struct audit_buffer *ab);
/* Private API (for audit.c only) */
extern void __audit_ipc_obj(struct kern_ipc_perm *ipcp);
extern void __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, umode_t mode);
@ -647,9 +645,6 @@ static inline void audit_ntp_log(const struct audit_ntp_data *ad)
static inline void audit_ptrace(struct task_struct *t)
{ }
static inline void audit_log_task(struct audit_buffer *ab)
{ }
#define audit_n_rules 0
#define audit_signals 0
#endif /* CONFIG_AUDITSYSCALL */

1
include/uapi/linux/audit.h
View File

@ -116,7 +116,6 @@
#define AUDIT_FANOTIFY 1331 /* Fanotify access decision */
#define AUDIT_TIME_INJOFFSET 1332 /* Timekeeping offset injected */
#define AUDIT_TIME_ADJNTPVAL 1333 /* NTP value adjustment */
#define AUDIT_BPF 1334 /* BPF subsystem */
#define AUDIT_AVC 1400 /* SE Linux avc denial or grant */
#define AUDIT_SELINUX_ERR 1401 /* Internal SE Linux Errors */

2
kernel/auditsc.c
View File

@ -2545,7 +2545,7 @@ void __audit_ntp_log(const struct audit_ntp_data *ad)
audit_log_ntp_val(ad, "adjust", AUDIT_NTP_ADJUST);
}
void audit_log_task(struct audit_buffer *ab)
static void audit_log_task(struct audit_buffer *ab)
{
kuid_t auid, uid;
kgid_t gid;

31
kernel/bpf/syscall.c
View File

@ -23,7 +23,6 @@
#include <linux/timekeeping.h>
#include <linux/ctype.h>
#include <linux/nospec.h>
#include <linux/audit.h>
#include <uapi/linux/btf.h>
#define IS_FD_ARRAY(map) ((map)->map_type == BPF_MAP_TYPE_PROG_ARRAY || \
@ -1322,34 +1321,6 @@ static void free_used_maps(struct bpf_prog_aux *aux)
kfree(aux->used_maps);
}
enum bpf_event {
BPF_EVENT_LOAD,
BPF_EVENT_UNLOAD,
};
static const char * const bpf_event_audit_str[] = {
[BPF_EVENT_LOAD] = "LOAD",
[BPF_EVENT_UNLOAD] = "UNLOAD",
};
static void bpf_audit_prog(const struct bpf_prog *prog, enum bpf_event event)
{
bool has_task_context = event == BPF_EVENT_LOAD;
struct audit_buffer *ab;
if (audit_enabled == AUDIT_OFF)
return;
ab = audit_log_start(audit_context(), GFP_ATOMIC, AUDIT_BPF);
if (unlikely(!ab))
return;
if (has_task_context)
audit_log_task(ab);
audit_log_format(ab, "%sprog-id=%u event=%s",
has_task_context ? " " : "",
prog->aux->id, bpf_event_audit_str[event]);
audit_log_end(ab);
}
int __bpf_prog_charge(struct user_struct *user, u32 pages)
{
unsigned long memlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
@ -1466,7 +1437,6 @@ static void __bpf_prog_put(struct bpf_prog *prog, bool do_idr_lock)
{
if (atomic64_dec_and_test(&prog->aux->refcnt)) {
perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_UNLOAD, 0);
bpf_audit_prog(prog, BPF_EVENT_UNLOAD);
/* bpf_prog_free_id() must be called first */
bpf_prog_free_id(prog, do_idr_lock);
__bpf_prog_put_noref(prog, true);
@ -1876,7 +1846,6 @@ static int bpf_prog_load(union bpf_attr *attr, union bpf_attr __user *uattr)
*/
bpf_prog_kallsyms_add(prog);
perf_event_bpf_event(prog, PERF_BPF_EVENT_PROG_LOAD, 0);
bpf_audit_prog(prog, BPF_EVENT_LOAD);
err = bpf_prog_new_fd(prog);
if (err < 0)