From: Björn Töpel bjorn@rivosinc.com
BPF tests that load /proc/kallsyms, e.g. bpf_cookie, will perform a buffer overrun if the number of syms on the system is larger than MAX_SYMS.
Bump the MAX_SYMS to 400000, and add a runtime check that bails out if the maximum is reached.
Signed-off-by: Björn Töpel bjorn@rivosinc.com --- tools/testing/selftests/bpf/trace_helpers.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/bpf/trace_helpers.c b/tools/testing/selftests/bpf/trace_helpers.c index 9b070cdf44ac..f83d9f65c65b 100644 --- a/tools/testing/selftests/bpf/trace_helpers.c +++ b/tools/testing/selftests/bpf/trace_helpers.c @@ -18,7 +18,7 @@ #define TRACEFS_PIPE "/sys/kernel/tracing/trace_pipe" #define DEBUGFS_PIPE "/sys/kernel/debug/tracing/trace_pipe"
-#define MAX_SYMS 300000 +#define MAX_SYMS 400000 static struct ksym syms[MAX_SYMS]; static int sym_cnt;
@@ -46,6 +46,9 @@ int load_kallsyms_refresh(void) break; if (!addr) continue; + if (i >= MAX_SYMS) + return -EFBIG; + syms[i].addr = (long) addr; syms[i].name = strdup(func); i++;
base-commit: fd283ab196a867f8f65f36913e0fadd031fcb823