linux/tools/bpf
Alan Maguire 04cb8453a9 bpftool: JIT limited misreported as negative value on aarch64
On aarch64, "bpftool feature" reports an incorrect BPF JIT limit:

$ sudo /sbin/bpftool feature
Scanning system configuration...
bpf() syscall restricted to privileged users
JIT compiler is enabled
JIT compiler hardening is disabled
JIT compiler kallsyms exports are enabled for root
skipping kernel config, can't open file: No such file or directory
Global memory limit for JIT compiler for unprivileged users is -201326592 bytes

This is because /proc/sys/net/core/bpf_jit_limit reports

$ sudo cat /proc/sys/net/core/bpf_jit_limit
68169519595520

...and an int is assumed in read_procfs().  Change read_procfs()
to return a long to avoid negative value reporting.

Fixes: 7a4522bbef ("tools: bpftool: add probes for /proc/ eBPF parameters")
Reported-by: Nicky Veitch <nicky.veitch@oracle.com>
Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Quentin Monnet <quentin@isovalent.com>
Link: https://lore.kernel.org/bpf/20230512113134.58996-1-alan.maguire@oracle.com
2023-05-15 21:14:48 +02:00
..
bpftool bpftool: JIT limited misreported as negative value on aarch64 2023-05-15 21:14:48 +02:00
resolve_btfids tools/resolve_btfids: Add /libsubcmd to .gitignore 2023-03-06 16:23:01 +01:00
runqslower tools: runqslower: Add EXTRA_CFLAGS and EXTRA_LDFLAGS support 2023-02-10 15:21:26 -08:00
.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