From: Alexander Lobakin alobakin@dlink.ru
commit 1148f9adbe71415836a18a36c1b4ece999ab0973 upstream.
proc_dointvec_minmax_bpf_restricted() has been firstly introduced in commit 2e4a30983b0f ("bpf: restrict access to core bpf sysctls") under CONFIG_HAVE_EBPF_JIT. Then, this ifdef has been removed in ede95a63b5e8 ("bpf: add bpf_jit_limit knob to restrict unpriv allocations"), because a new sysctl, bpf_jit_limit, made use of it. Finally, this parameter has become long instead of integer with fdadd04931c2 ("bpf: fix bpf_jit_limit knob for PAGE_SIZE >= 64K") and thus, a new proc_dolongvec_minmax_bpf_restricted() has been added.
With this last change, we got back to that proc_dointvec_minmax_bpf_restricted() is used only under CONFIG_HAVE_EBPF_JIT, but the corresponding ifdef has not been brought back.
So, in configurations like CONFIG_BPF_JIT=y && CONFIG_HAVE_EBPF_JIT=n since v4.20 we have:
CC net/core/sysctl_net_core.o net/core/sysctl_net_core.c:292:1: warning: ‘proc_dointvec_minmax_bpf_restricted’ defined but not used [-Wunused-function] 292 | proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Suppress this by guarding it with CONFIG_HAVE_EBPF_JIT again.
Fixes: fdadd04931c2 ("bpf: fix bpf_jit_limit knob for PAGE_SIZE >= 64K") Signed-off-by: Alexander Lobakin alobakin@dlink.ru Signed-off-by: Daniel Borkmann daniel@iogearbox.net Link: https://lore.kernel.org/bpf/20191218091821.7080-1-alobakin@dlink.ru Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- net/core/sysctl_net_core.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/net/core/sysctl_net_core.c +++ b/net/core/sysctl_net_core.c @@ -288,6 +288,7 @@ static int proc_dointvec_minmax_bpf_enab return ret; }
+# ifdef CONFIG_HAVE_EBPF_JIT static int proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write, void __user *buffer, size_t *lenp, @@ -298,6 +299,7 @@ proc_dointvec_minmax_bpf_restricted(stru
return proc_dointvec_minmax(table, write, buffer, lenp, ppos); } +# endif /* CONFIG_HAVE_EBPF_JIT */
static int proc_dolongvec_minmax_bpf_restricted(struct ctl_table *table, int write,