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Viktor Malik 38d906f1c5 bpftool: Fix readlink usage in get_fd_type 
[ Upstream commit 0053f7d39d ]

The `readlink(path, buf, sizeof(buf))` call reads at most sizeof(buf)
bytes and *does not* append null-terminator to buf. With respect to
that, fix two pieces in get_fd_type:

1. Change the truncation check to contain sizeof(buf) rather than
   sizeof(path).
2. Append null-terminator to buf.

Reported by Coverity.

Signed-off-by: Viktor Malik <vmalik@redhat.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Quentin Monnet <qmo@kernel.org>
Link: https://lore.kernel.org/bpf/20250129071857.75182-1-vmalik@redhat.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2025-06-04 14:42:14 +02:00
..
bpftool bpftool: Fix readlink usage in get_fd_type 2025-06-04 14:42:14 +02:00
resolve_btfids tools/resolve_btfids: Fix comparison of distinct pointer types warning in resolve_btfids 2024-08-03 08:54:37 +02:00
runqslower tools/runqslower: Fix LDFLAGS and add LDLIBS support 2024-10-04 16:29:15 +02:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
bpf_asm.c docs: networking: convert filter.txt to ReST 2020-04-28 14:39:46 -07:00
bpf_dbg.c bpf: Simplify the calculation of variables 2021-03-04 19:24:53 -08:00
bpf_exp.l bpf: fix cbpf parser bug for octal numbers 2018-06-03 07:46:55 -07:00
bpf_exp.y tools, bpf_asm: Exit non-zero on errors 2021-02-26 22:53:50 +01:00
bpf_jit_disasm.c tools bpf_jit_disasm: Fix compilation error with new binutils 2022-08-01 15:30:48 -03:00
Makefile tools bpf_jit_disasm: Don't display disassembler-four-args feature test 2022-08-01 15:31:51 -03:00