diff options
Diffstat (limited to 'tools/testing/selftests/bpf/progs/strobemeta.h')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/strobemeta.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/strobemeta.h b/tools/testing/selftests/bpf/progs/strobemeta.h index 7de534f38c3f..3687ea755ab5 100644 --- a/tools/testing/selftests/bpf/progs/strobemeta.h +++ b/tools/testing/selftests/bpf/progs/strobemeta.h @@ -10,6 +10,14 @@ #include <linux/types.h> #include <bpf/bpf_helpers.h> +#define bpf_clamp_umax(VAR, UMAX) \ + asm volatile ( \ + "if %0 <= %[max] goto +1\n" \ + "%0 = %[max]\n" \ + : "+r"(VAR) \ + : [max]"i"(UMAX) \ + ) + typedef uint32_t pid_t; struct task_struct {}; @@ -413,6 +421,7 @@ static __always_inline void *read_map_var(struct strobemeta_cfg *cfg, len = bpf_probe_read_user_str(payload, STROBE_MAX_STR_LEN, map.tag); if (len <= STROBE_MAX_STR_LEN) { + bpf_clamp_umax(len, STROBE_MAX_STR_LEN); descr->tag_len = len; payload += len; } @@ -430,6 +439,7 @@ static __always_inline void *read_map_var(struct strobemeta_cfg *cfg, len = bpf_probe_read_user_str(payload, STROBE_MAX_STR_LEN, map.entries[i].key); if (len <= STROBE_MAX_STR_LEN) { + bpf_clamp_umax(len, STROBE_MAX_STR_LEN); descr->key_lens[i] = len; payload += len; } @@ -437,6 +447,7 @@ static __always_inline void *read_map_var(struct strobemeta_cfg *cfg, len = bpf_probe_read_user_str(payload, STROBE_MAX_STR_LEN, map.entries[i].val); if (len <= STROBE_MAX_STR_LEN) { + bpf_clamp_umax(len, STROBE_MAX_STR_LEN); descr->val_lens[i] = len; payload += len; } |