netdev - Re: [PATCH bpf-next v2] bpftool: Remove usage of reallocarray()

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Date:   Mon, 21 Feb 2022 15:48:46 +0000
From:   Quentin Monnet <quentin@...valent.com>
To:     Mauricio Vásquez <mauricio@...volk.io>,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>
Subject: Re: [PATCH bpf-next v2] bpftool: Remove usage of reallocarray()

2022-02-21 07:56 UTC-0500 ~ Mauricio Vásquez <mauricio@...volk.io>
> This commit fixes a compilation error on systems with glibc < 2.26 [0]:
> 
> ```
> In file included from main.h:14:0,
>                  from gen.c:24:
> linux/tools/include/tools/libc_compat.h:11:21: error: attempt to use poisoned "reallocarray"
>  static inline void *reallocarray(void *ptr, size_t nmemb, size_t size)
> ```
> 
> This happens because gen.c pulls <bpf/libbpf_internal.h>, and then
> <tools/libc_compat.h> (through main.h). When
> COMPAT_NEED_REALLOCARRAY is set, libc_compat.h defines reallocarray()
> which libbpf_internal.h poisons with a GCC pragma.
> 
> This commit reuses libbpf_reallocarray() implemented in commit
> 029258d7b228 ("libbpf: Remove any use of reallocarray() in libbpf").
> 
> v1 -> v2:
> - reuse libbpf_reallocarray() instead of reimplementing it
> 
> Reported-by: Quentin Monnet <quentin@...valent.com>
> Signed-off-by: Mauricio Vásquez <mauricio@...volk.io>
> 
> [0]: https://lore.kernel.org/bpf/3bf2bd49-9f2d-a2df-5536-bc0dde70a83b@isovalent.com/

Fixes: a9caaba399f9 ("bpftool: Implement "gen min_core_btf" logic")
Reviewed-by: Quentin Monnet <quentin@...valent.com>

Thanks!