Maxim Mikityanskiy 48419bc90e bpf: Fix the test_task_vma selftest to support output shorter than 1 kB ... [ Upstream commit da54ab1495 ] The test for bpf_iter_task_vma assumes that the output will be longer than 1 kB, as the comment above the loop says. Due to this assumption, the loop becomes infinite if the output turns to be shorter than 1 kB. The return value of read_fd_into_buffer is 0 when the end of file was reached, and len isn't being increased any more. This commit adds a break on EOF to handle short output correctly. For the reference, this is the contents that I get when running test_progs under vmtest.sh, and it's shorter than 1 kB: 00400000-00401000 r--p 00000000 fe:00 25867 /root/bpf/test_progs 00401000-00674000 r-xp 00001000 fe:00 25867 /root/bpf/test_progs 00674000-0095f000 r--p 00274000 fe:00 25867 /root/bpf/test_progs 0095f000-00983000 r--p 0055e000 fe:00 25867 /root/bpf/test_progs 00983000-00a8a000 rw-p 00582000 fe:00 25867 /root/bpf/test_progs 00a8a000-0484e000 rw-p 00000000 00:00 0 7f6c64000000-7f6c64021000 rw-p 00000000 00:00 0 7f6c64021000-7f6c68000000 ---p 00000000 00:00 0 7f6c6ac8f000-7f6c6ac90000 r--s 00000000 00:0d 8032 anon_inode:bpf-map 7f6c6ac90000-7f6c6ac91000 ---p 00000000 00:00 0 7f6c6ac91000-7f6c6b491000 rw-p 00000000 00:00 0 7f6c6b491000-7f6c6b492000 r--s 00000000 00:0d 8032 anon_inode:bpf-map 7f6c6b492000-7f6c6b493000 rw-s 00000000 00:0d 8032 anon_inode:bpf-map 7ffc1e23d000-7ffc1e25e000 rw-p 00000000 00:00 0 7ffc1e3b8000-7ffc1e3bc000 r--p 00000000 00:00 0 7ffc1e3bc000-7ffc1e3bd000 r-xp 00000000 00:00 0 7fffffffe000-7ffffffff000 --xp 00000000 00:00 0 Fixes: e8168840e1 ("selftests/bpf: Add test for bpf_iter_task_vma") Signed-off-by: Maxim Mikityanskiy <maximmi@nvidia.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/bpf/20211130181811.594220-1-maximmi@nvidia.com Signed-off-by: Sasha Levin <sashal@kernel.org>		2022-01-27 11:03:27 +01:00
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accounting	…
arch	x86/insn: Use get_unaligned() instead of memcpy()	2021-11-18 19:16:30 +01:00
bootconfig	…
bpf	bpftool: Fix memory leak in prog_dump()	2022-01-27 11:03:07 +01:00
build	tools build: Remove needless libpython-version feature check that breaks test-all fast path	2021-12-14 10:57:18 +01:00
cgroup	…
debugging	…
edid	…
firewire	…
firmware	…
gpio	…
hv	…
iio	…
include	tools/nolibc: fix incorrect truncation of exit code	2022-01-27 11:02:51 +01:00
io_uring	…
kvm/kvm_stat	…
laptop	…
leds	…
lib	libbpf: Clean gen_loader's attach kind.	2022-01-27 11:03:24 +01:00
memory-model	…
objtool	objtool: Handle __sanitize_cov*() tail calls	2021-11-18 19:16:23 +01:00
pci	…
pcmcia	…
perf	perf annotate: Avoid TUI crash when navigating in the annotation of recursive functions	2022-01-20 09:13:15 +01:00
power	…
rcu	…
scripts	…
spi	…
testing	bpf: Fix the test_task_vma selftest to support output shorter than 1 kB	2022-01-27 11:03:27 +01:00
thermal/tmon	…
time	…
tracing	tools/latency-collector: Use correct size when writing queue_full_warning	2021-11-18 19:16:19 +01:00
usb	…
virtio	…
vm	…
wmi	…
Makefile	…