| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.10 49/93] bpf: Exempt CAP_BPF from checks against bpf_jit_limit | Date | Mon, 4 Oct 2021 14:52:47 +0200 |
| |
From: Lorenz Bauer <lmb@cloudflare.com>
[ Upstream commit 8a98ae12fbefdb583a7696de719a1d57e5e940a2 ]
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> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20210922111153.19843-1-lmb@cloudflare.com Signed-off-by: Sasha Levin <sashal@kernel.org> --- 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 d12efb2550d3..2e4a658d65d6 100644 --- a/kernel/bpf/core.c +++ b/kernel/bpf/core.c @@ -831,7 +831,7 @@ 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; } -- 2.33.0
|