From: Lorenz Bauer <lmb@cloudflare.com>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>
Cc: kernel-team@cloudflare.com, Lorenz Bauer <lmb@cloudflare.com>,
netdev@vger.kernel.org, bpf@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH bpf] bpf: exempt CAP_BPF from checks against bpf_jit_limit
Date: Wed, 22 Sep 2021 12:11:52 +0100 [thread overview]
Message-ID: <20210922111153.19843-1-lmb@cloudflare.com> (raw)
When introducing CAP_BPF, bpf_jit_charge_modmem was not changed to
treat programs with CAP_BPF as privileged for the purpose of JIT
memory allocation. This means that a program without CAP_BPF can
block a program with CAP_BPF from loading a program.
Fix this by checking bpf_capable in bpf_jit_charge_modmem.
Fixes: 2c78ee898d8f ("bpf: Implement CAP_BPF")
Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
---
kernel/bpf/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 6fddc13fe67f..ea8a468dbded 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -827,7 +827,7 @@ int bpf_jit_charge_modmem(u32 pages)
{
if (atomic_long_add_return(pages, &bpf_jit_current) >
(bpf_jit_limit >> PAGE_SHIFT)) {
- if (!capable(CAP_SYS_ADMIN)) {
+ if (!bpf_capable()) {
atomic_long_sub(pages, &bpf_jit_current);
return -EPERM;
}
--
2.30.2
next reply other threads:[~2021-09-22 11:11 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-22 11:11 Lorenz Bauer [this message]
2021-09-22 21:40 ` [PATCH bpf] bpf: exempt CAP_BPF from checks against bpf_jit_limit patchwork-bot+netdevbpf
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