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Yonghong Song 248010d2fd bpf: Implement bpf_seq_read() for bpf iterator 
[upstream commit fd4f12bc38c3ad9107169e7c9e6e7f81d93dda97]

bpf iterator uses seq_file to provide a lossless
way to transfer data to user space. But we want to call
bpf program after all objects have been traversed, and
bpf program may write additional data to the
seq_file buffer. The current seq_read() does not work
for this use case.

Besides allowing stop() function to write to the buffer,
the bpf_seq_read() also fixed the buffer size to one page.
If any single call of show() or stop() will emit data
more than one page to cause overflow, -E2BIG error code
will be returned to user space.

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200509175904.2475468-1-yhs@fb.com
 		2022-06-21 10:27:11 +08:00
Documentation bpf/flow_dissector: add mode to enforce global BPF flow dissector 2022-06-21 10:27:09 +08:00
LICENSES Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
arch bpf: Fix trampoline generation for fmod_ret programs 2022-06-21 10:27:07 +08:00
block block: dont count passthrough req as inflight 2022-06-01 10:11:12 +08:00
certs certs: Fix blacklist flag type confusion 2021-04-12 12:52:25 +08:00
crypto crypto: rng - fix crypto_rng_reset() refcounting when !CRYPTO_STATS 2021-05-20 16:07:34 +08:00
drivers net: tun: track dropped skb via kfree_skb_reason() 2022-06-17 10:08:51 +08:00
fs dax: Fix incorrect argument passed to xas_set_err() 2022-06-09 10:01:21 +08:00
include bpf: Support bpf tracing/iter programs for BPF_LINK_CREATE 2022-06-21 10:27:11 +08:00
init bpf: Introduce BPF_PROG_TYPE_LSM 2022-06-21 10:27:08 +08:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2021-03-16 16:27:51 +08:00
kernel bpf: Implement bpf_seq_read() for bpf iterator 2022-06-21 10:27:11 +08:00
lib libfdt: include fdt_addresses.c 2022-06-06 14:14:45 +08:00
mm uaccess: Add strict non-pagefault kernel-space read function 2022-06-21 10:27:04 +08:00
net udp6: Run SK_LOOKUP BPF program on socket lookup 2022-06-21 10:27:10 +08:00
package arm64/config: open CONFIG_IOSCHED_BFQ and CONFIG_BFQ_GROUP_IOSCHED 2022-06-10 17:13:42 +08:00
samples kfifo: fix ternary sign extension bugs 2021-05-20 16:08:01 +08:00
scripts kabi: kabi check support 2021-06-23 07:24:18 +00:00
security capabilities: Introduce CAP_PERFMON to kernel and user space 2022-06-21 10:27:09 +08:00
sound ALSA: usb: midi: don't return -ENOMEM when usb_urb_ep_type_check fails 2021-05-20 16:07:59 +08:00
tools bpf: Support bpf tracing/iter programs for BPF_LINK_CREATE 2022-06-21 10:27:11 +08:00
usr Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
virt KVM: Stop looking for coalesced MMIO zones if the bus is destroyed 2021-05-20 16:07:44 +08:00
.clang-format Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.cocciconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.get_maintainer.ignore Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.gitattributes Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.gitignore Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
COPYING Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
CREDITS Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kbuild Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
MAINTAINERS bpf: Introduce BPF_PROG_TYPE_LSM 2022-06-21 10:27:08 +08:00
Makefile Rebase to linux long term 5.4.119 2021-05-20 16:08:02 +08:00
README Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
README.md Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
backport_remove_lists.txt Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
tools_key.pub Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00

README.md

Tencent Linux Kernel 4.0