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@xxxxxxxxxxxxx>
Signed-off-by: Mauricio Vásquez <mauricio@xxxxxxxxxx>
[0]: https://lore.kernel.org/bpf/3bf2bd49-9f2d-a2df-5536-bc0dde70a83b@xxxxxxxxxxxxx/
---
tools/bpf/bpftool/Makefile | 6 +-----
tools/bpf/bpftool/main.h | 2 +-
tools/bpf/bpftool/prog.c | 7 ++++---
tools/bpf/bpftool/xlated_dumper.c | 5 +++--
4 files changed, 9 insertions(+), 11 deletions(-)
diff --git a/tools/bpf/bpftool/Makefile b/tools/bpf/bpftool/Makefile
index a137db96bd56..ba647aede0d6 100644
--- a/tools/bpf/bpftool/Makefile
+++ b/tools/bpf/bpftool/Makefile
@@ -93,7 +93,7 @@ INSTALL ?= install
RM ?= rm -f
FEATURE_USER = .bpftool
-FEATURE_TESTS = libbfd disassembler-four-args reallocarray zlib libcap \
+FEATURE_TESTS = libbfd disassembler-four-args zlib libcap \
clang-bpf-co-re
FEATURE_DISPLAY = libbfd disassembler-four-args zlib libcap \
clang-bpf-co-re
@@ -118,10 +118,6 @@ ifeq ($(feature-disassembler-four-args), 1)
CFLAGS += -DDISASM_FOUR_ARGS_SIGNATURE
endif
-ifeq ($(feature-reallocarray), 0)
-CFLAGS += -DCOMPAT_NEED_REALLOCARRAY
-endif
-
LIBS = $(LIBBPF) -lelf -lz
LIBS_BOOTSTRAP = $(LIBBPF_BOOTSTRAP) -lelf -lz
ifeq ($(feature-libcap), 1)
diff --git a/tools/bpf/bpftool/main.h b/tools/bpf/bpftool/main.h
index 0c3840596b5a..0468e5b24bd4 100644
--- a/tools/bpf/bpftool/main.h
+++ b/tools/bpf/bpftool/main.h
@@ -8,10 +8,10 @@
#undef GCC_VERSION
#include <stdbool.h>
#include <stdio.h>
+#include <stdlib.h>
#include <linux/bpf.h>
#include <linux/compiler.h>
#include <linux/kernel.h>
-#include <tools/libc_compat.h>
#include <bpf/hashmap.h>
#include <bpf/libbpf.h>
diff --git a/tools/bpf/bpftool/prog.c b/tools/bpf/bpftool/prog.c
index 92a6f679ef7d..8a52eed19fa2 100644
--- a/tools/bpf/bpftool/prog.c
+++ b/tools/bpf/bpftool/prog.c
@@ -26,6 +26,7 @@
#include <bpf/btf.h>
#include <bpf/hashmap.h>
#include <bpf/libbpf.h>
+#include <bpf/libbpf_internal.h>
#include <bpf/skel_internal.h>
#include "cfg.h"
@@ -1558,9 +1559,9 @@ static int load_with_options(int argc, char **argv, bool first_prog_only)
if (fd < 0)
goto err_free_reuse_maps;
- new_map_replace = reallocarray(map_replace,
- old_map_fds + 1,
- sizeof(*map_replace));
+ new_map_replace = libbpf_reallocarray(map_replace,
+ old_map_fds + 1,
+ sizeof(*map_replace));
if (!new_map_replace) {
p_err("mem alloc failed");
goto err_free_reuse_maps;
diff --git a/tools/bpf/bpftool/xlated_dumper.c b/tools/bpf/bpftool/xlated_dumper.c
index f1f32e21d5cd..2d9cd6a7b3c8 100644
--- a/tools/bpf/bpftool/xlated_dumper.c
+++ b/tools/bpf/bpftool/xlated_dumper.c
@@ -8,6 +8,7 @@
#include <string.h>
#include <sys/types.h>
#include <bpf/libbpf.h>
+#include <bpf/libbpf_internal.h>
#include "disasm.h"
#include "json_writer.h"
@@ -32,8 +33,8 @@ void kernel_syms_load(struct dump_data *dd)
return;
while (fgets(buff, sizeof(buff), fp)) {
- tmp = reallocarray(dd->sym_mapping, dd->sym_count + 1,
- sizeof(*dd->sym_mapping));
+ tmp = libbpf_reallocarray(dd->sym_mapping, dd->sym_count + 1,
+ sizeof(*dd->sym_mapping));
if (!tmp) {
out:
free(dd->sym_mapping);
--
2.25.1
