From: Hannes Frederic Sowa Date: Wed, 26 Apr 2017 23:39:33 +0000 (+0200) Subject: bpf: bpf_lock on kallsysms doesn't need to be irqsave X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=d24f7c7fb91d94556936f2511035d1f123b449f4;p=openwrt%2Fstaging%2Fblogic.git bpf: bpf_lock on kallsysms doesn't need to be irqsave Hannes rightfully spotted that the bpf_lock doesn't need to be irqsave variant. We never perform any such updates where this would be necessary (neither right now nor in future), therefore relax this further. Signed-off-by: Hannes Frederic Sowa Signed-off-by: Daniel Borkmann Acked-by: Alexei Starovoitov Signed-off-by: David S. Miller --- diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c index b4f1cb0c5ac7..6f81e0f5a0fa 100644 --- a/kernel/bpf/core.c +++ b/kernel/bpf/core.c @@ -394,27 +394,23 @@ static bool bpf_prog_kallsyms_verify_off(const struct bpf_prog *fp) void bpf_prog_kallsyms_add(struct bpf_prog *fp) { - unsigned long flags; - if (!bpf_prog_kallsyms_candidate(fp) || !capable(CAP_SYS_ADMIN)) return; - spin_lock_irqsave(&bpf_lock, flags); + spin_lock_bh(&bpf_lock); bpf_prog_ksym_node_add(fp->aux); - spin_unlock_irqrestore(&bpf_lock, flags); + spin_unlock_bh(&bpf_lock); } void bpf_prog_kallsyms_del(struct bpf_prog *fp) { - unsigned long flags; - if (!bpf_prog_kallsyms_candidate(fp)) return; - spin_lock_irqsave(&bpf_lock, flags); + spin_lock_bh(&bpf_lock); bpf_prog_ksym_node_del(fp->aux); - spin_unlock_irqrestore(&bpf_lock, flags); + spin_unlock_bh(&bpf_lock); } static struct bpf_prog *bpf_prog_kallsyms_find(unsigned long addr)