Lorenz Bauer 248e00ac47 bpf: cgroup: Allow multi-attach program to replace itself ... When using BPF_PROG_ATTACH to attach a program to a cgroup in BPF_F_ALLOW_MULTI mode, it is not possible to replace a program with itself. This is because the check for duplicate programs doesn't take the replacement program into account. Replacing a program with itself might seem weird, but it has some uses: first, it allows resetting the associated cgroup storage. Second, it makes the API consistent with the non-ALLOW_MULTI usage, where it is possible to replace a program with itself. Third, it aligns BPF_PROG_ATTACH with bpf_link, where replacing itself is also supported. Sice this code has been refactored a few times this change will only apply to v5.7 and later. Adjustments could be made to commit 1020c1f24a ("bpf: Simplify __cgroup_bpf_attach") and commit d7bf2c10af ("bpf: allocate cgroup storage entries on attaching bpf programs") as well as commit 324bda9e6c ("bpf: multi program support for cgroup+bpf") Fixes: af6eea5743 ("bpf: Implement bpf_link-based cgroup BPF program attachment") Signed-off-by: Lorenz Bauer <lmb@cloudflare.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200608162202.94002-1-lmb@cloudflare.com		2020-06-09 11:21:43 -07:00
..
accounting	SPDX patches for 5.7-rc1.	2020-04-03 13:12:26 -07:00
arch	ARM:	2020-06-03 15:13:47 -07:00
bootconfig	tools/bootconfig: Fix apply_xbc() to return zero on success	2020-05-11 17:00:26 -04:00
bpf	tools/bpf: Don't use $(COMPILE.c)	2020-06-02 22:02:38 +02:00
build	perf: cs-etm: Update to build with latest opencsd version.	2020-05-05 16:35:32 -03:00
cgroup	Merge branch 'block-5.7' into for-5.8/block	2020-05-09 16:13:58 -06:00
debugging
edid
firewire
firmware
gpio	This is the bulk of GPIO development for the v5.7 kernel cycle.	2020-04-04 10:27:00 -07:00
hv
iio	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
include	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next	2020-06-03 16:27:18 -07:00
io_uring
kvm/kvm_stat	tools/kvm_stat: add sample systemd unit file	2020-04-21 09:13:12 -04:00
laptop	change email address for Pali Rohár	2020-04-10 15:36:22 -07:00
leds	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
lib	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next	2020-06-03 16:27:18 -07:00
memory-model	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
nfsd
objtool	objtool: Enable compilation of objtool for all architectures	2020-05-20 09:17:28 -05:00
pci	tools: PCI: Add 'e' to clear IRQ	2020-04-02 17:57:10 +01:00
pcmcia	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
perf	perf flamegraph: Use /bin/bash for report and record scripts	2020-05-05 16:35:32 -03:00
power	Power management updates for 5.8-rc1	2020-06-02 13:17:23 -07:00
scripts	Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net	2020-03-25 18:58:11 -07:00
spi	spi: spidev_test: Add support for Octal mode data transfers	2020-04-16 13:54:45 +01:00
testing	bpf: cgroup: Allow multi-attach program to replace itself	2020-06-09 11:21:43 -07:00
thermal/tmon	- Convert tsens configuration DT binding to yaml (Rajeshwari)	2020-04-07 20:00:16 -07:00
time
usb	.gitignore: add SPDX License Identifier	2020-03-25 11:50:48 +01:00
virtio	tools/virtio: make asm/barrier.h self contained	2020-04-17 06:05:29 -04:00
vm	tools/vm: fix cross-compile build	2020-04-21 11:11:56 -07:00
wmi
Makefile