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| author | Björn Töpel <bjorn@rivosinc.com> | 2023-07-06 17:22:28 +0300 |
|---|---|---|
| committer | Andrii Nakryiko <andrii@kernel.org> | 2023-07-06 23:39:40 +0300 |
| commit | e76a014334a6d46a9c21356afa25aa5b81566540 (patch) | |
| tree | 1bc4937e7daff0717b87cd5e75480a950a984f3d /tools/testing/selftests/bpf/trace_helpers.c | |
| parent | b625030c9027c3ad648da8400f20d6100391a4e6 (diff) | |
| download | linux-e76a014334a6d46a9c21356afa25aa5b81566540.tar.xz | |
selftests/bpf: Bump and validate MAX_SYMS
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>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/bpf/20230706142228.1128452-1-bjorn@kernel.org
Diffstat (limited to 'tools/testing/selftests/bpf/trace_helpers.c')
| -rw-r--r-- | tools/testing/selftests/bpf/trace_helpers.c | 5 |
1 files changed, 4 insertions, 1 deletions
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++; |