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Make fuzzer_stats update atomic

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This writes fuzzer_stats to a temp file and then atomically renames the
temp file into fuzzer_stats so that any read on fuzzer_stats will always
return a consistent view of the AFL state (otherwise there is a very
low change of AFL's write and $tool's reads to race and yield
inconsistent results).
This commit is contained in:
coco
2023-10-04 12:29:41 -07:00
parent 17bfb3a408
commit c622e4c565
1 changed files with 6 additions and 3 deletions
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9
src/afl-fuzz-stats.c
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@ -250,11 +250,13 @@ void write_stats_file(afl_state_t *afl, u32 t_bytes, double bitmap_cvg,
#endif
u64 cur_time = get_cur_time();
u8 fn[PATH_MAX];
u8 fn_tmp[PATH_MAX];
u8 fn_final[PATH_MAX];
FILE *f;
snprintf(fn, PATH_MAX, "%s/fuzzer_stats", afl->out_dir);
f = create_ffile(fn);
snprintf(fn_tmp, PATH_MAX, "%s/.fuzzer_stats_tmp", afl->out_dir);
snprintf(fn_final, PATH_MAX, "%s/fuzzer_stats", afl->out_dir);
f = create_ffile(fn_tmp);
/* Keep last values in case we're called from another context
where exec/sec stats and such are not readily available. */
@ -412,6 +414,7 @@ void write_stats_file(afl_state_t *afl, u32 t_bytes, double bitmap_cvg,
}
fclose(f);
rename(fn_tmp, fn_final);
}