2022-03-25 12:44:09

by Milan Landaverde

Subject: [PATCH bpf-next] bpf/bpftool: add unprivileged_bpf_disabled check against value of 2

In [1], we added a kconfig knob that can set
/proc/sys/kernel/unprivileged_bpf_disabled to 2

We now check against this value in bpftool feature probe

[1] https://lore.kernel.org/bpf/74ec548079189e4e4dffaeb42b8987bb3c852eee.1620765074.git.daniel@iogearbox.net

Signed-off-by: Milan Landaverde <[email protected]>
---
tools/bpf/bpftool/feature.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/bpf/bpftool/feature.c b/tools/bpf/bpftool/feature.c
index c2f43a5d38e0..290998c82de1 100644
--- a/tools/bpf/bpftool/feature.c
+++ b/tools/bpf/bpftool/feature.c
@@ -207,7 +207,10 @@ static void probe_unprivileged_disabled(void)
printf("bpf() syscall for unprivileged users is enabled\n");
break;
case 1:
- printf("bpf() syscall restricted to privileged users\n");
+ printf("bpf() syscall restricted to privileged users (without recovery)\n");
+ break;
+ case 2:
+ printf("bpf() syscall restricted to privileged users (admin can change)\n");
break;
case -1:
printf("Unable to retrieve required privileges for bpf() syscall\n");
--
2.32.0

2022-03-29 02:34:50

by patchwork-bot+netdevbpf

Subject: Re: [PATCH bpf-next] bpf/bpftool: add unprivileged_bpf_disabled check against value of 2

Hello:

This patch was applied to bpf/bpf.git (master)
by Alexei Starovoitov <[email protected]>:

On Tue, 22 Mar 2022 10:49:45 -0400 you wrote:
> In [1], we added a kconfig knob that can set
> /proc/sys/kernel/unprivileged_bpf_disabled to 2
>
> We now check against this value in bpftool feature probe
>
> [1] https://lore.kernel.org/bpf/74ec548079189e4e4dffaeb42b8987bb3c852eee.1620765074.git.daniel@iogearbox.net
>
> [...]

Here is the summary with links:
- [bpf-next] bpf/bpftool: add unprivileged_bpf_disabled check against value of 2
https://git.kernel.org/bpf/bpf/c/8c1b21198551

You are awesome, thank you!
--
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