diff options
Diffstat (limited to 'kernel/sysctl.c')
| -rw-r--r-- | kernel/sysctl.c | 29 |
1 files changed, 25 insertions, 4 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c index a5d75bc38eea..03af4a493aff 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -250,6 +250,28 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write, #endif +#ifdef CONFIG_BPF_SYSCALL +static int bpf_unpriv_handler(struct ctl_table *table, int write, + void *buffer, size_t *lenp, loff_t *ppos) +{ + int ret, unpriv_enable = *(int *)table->data; + bool locked_state = unpriv_enable == 1; + struct ctl_table tmp = *table; + + if (write && !capable(CAP_SYS_ADMIN)) + return -EPERM; + + tmp.data = &unpriv_enable; + ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos); + if (write && !ret) { + if (locked_state && unpriv_enable != 1) + return -EPERM; + *(int *)table->data = unpriv_enable; + } + return ret; +} +#endif + static struct ctl_table kern_table[]; static struct ctl_table vm_table[]; static struct ctl_table fs_table[]; @@ -1220,10 +1242,9 @@ static struct ctl_table kern_table[] = { .data = &sysctl_unprivileged_bpf_disabled, .maxlen = sizeof(sysctl_unprivileged_bpf_disabled), .mode = 0644, - /* only handle a transition from default "0" to "1" */ - .proc_handler = proc_dointvec_minmax, - .extra1 = &one, - .extra2 = &one, + .proc_handler = bpf_unpriv_handler, + .extra1 = &zero, + .extra2 = &two, }, #endif #if defined(CONFIG_TREE_RCU) || defined(CONFIG_PREEMPT_RCU) |