On Sat, Feb 12, 2022 at 09:21:49PM +0000, Frank van der Linden wrote:
From: Daniel Borkmann daniel@iogearbox.net
commit 08389d888287c3823f80b0216766b71e17f0aba5 upstream.
Add a kconfig knob which allows for unprivileged bpf to be disabled by default. If set, the knob sets /proc/sys/kernel/unprivileged_bpf_disabled to value of 2.
This still allows a transition of 2 -> {0,1} through an admin. Similarly, this also still keeps 1 -> {1} behavior intact, so that once set to permanently disabled, it cannot be undone aside from a reboot.
We've also added extra2 with max of 2 for the procfs handler, so that an admin still has a chance to toggle between 0 <-> 2.
Either way, as an additional alternative, applications can make use of CAP_BPF that we added a while ago.
Signed-off-by: Daniel Borkmann daniel@iogearbox.net Signed-off-by: Alexei Starovoitov ast@kernel.org Link: https://lore.kernel.org/bpf/74ec548079189e4e4dffaeb42b8987bb3c852eee.1620765... [fllinden@amazon.com: backported to 4.9] Signed-off-by: Frank van der Linden fllinden@amazon.com
Documentation/sysctl/kernel.txt | 21 +++++++++++++++++++++ init/Kconfig | 10 ++++++++++ kernel/bpf/syscall.c | 3 ++- kernel/sysctl.c | 29 +++++++++++++++++++++++++---- 4 files changed, 58 insertions(+), 5 deletions(-)
Now queued up, thanks.
greg k-h