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not all CPUs know ondemand

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This commit is contained in:
van Hauser
2019-11-15 14:46:01 +01:00
parent d8264390d2
commit 4b3deaf28b
2 changed files with 21 additions and 5 deletions
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17
gcc_plugin/afl-gcc-pass.so.cc
View File

@ -113,6 +113,7 @@ static unsigned int ext_call_instrument(function *fun) {
DECL_EXTERNAL(fndecl) = 1; /* External linkage */ DECL_EXTERNAL(fndecl) = 1; /* External linkage */
DECL_ARTIFICIAL(fndecl) = 1; /* Injected by compiler */ DECL_ARTIFICIAL(fndecl) = 1; /* Injected by compiler */
printf("NEW FUNC %s\n", function_name(fun));
FOR_EACH_BB_FN(bb, fun) { FOR_EACH_BB_FN(bb, fun) {
gimple_seq fcall; gimple_seq fcall;
@ -128,24 +129,40 @@ static unsigned int ext_call_instrument(function *fun) {
int more_than_one = -1; int more_than_one = -1;
edge ep; edge ep;
edge_iterator eip; edge_iterator eip;
int foo = 0;
if (ep->flags & EDGE_FALLTHRU)
printf("pred %d fallthough\n", foo);
FOR_EACH_EDGE(ep, eip, bb->preds) { FOR_EACH_EDGE(ep, eip, bb->preds) {
int item = 0;
foo++;
printf("pred %d\n", foo);
if (ep->flags & EDGE_FALLTHRU)
printf("pred %d fallthough\n", foo);
int count = 0; int count = 0;
if (ep->flags & EDGE_FALLTHRU)
if (more_than_one == -1) more_than_one = 0; if (more_than_one == -1) more_than_one = 0;
basic_block Pred = ep->src; basic_block Pred = ep->src;
edge es; edge es;
edge_iterator eis; edge_iterator eis;
FOR_EACH_EDGE(es, eis, Pred->succs) { FOR_EACH_EDGE(es, eis, Pred->succs) {
item++;
if (es->flags & EDGE_FALLTHRU)
printf("item %d fallthough\n", item);
basic_block Succ = es->dest; basic_block Succ = es->dest;
if (Succ != NULL) count++; if (Succ != NULL) count++;
} }
printf("total items: %d\n", item);
if (count > 1) more_than_one = 1; if (count > 1) more_than_one = 1;
} }
printf("result: %d\n", more_than_one);
if (more_than_one != 1) continue; if (more_than_one != 1) continue;

9
src/afl-fuzz-init.c
View File

@ -1562,11 +1562,10 @@ void check_cpu_governor(void) {
" echo performance | tee cpu*/cpufreq/scaling_governor\n\n" " echo performance | tee cpu*/cpufreq/scaling_governor\n\n"
" You can later go back to the original state by replacing " " You can later go back to the original state by replacing "
"'performance' with\n" "'performance'\n"
" 'ondemand'. If you don't want to change the settings, set " " with 'ondemand' or 'powersave'. If you don't want to change the settings,\n"
"AFL_SKIP_CPUFREQ\n" " set AFL_SKIP_CPUFREQ to make afl-fuzz skip this check - but expect some\n"
" to make afl-fuzz skip this check - but expect some performance " " performance drop.\n",
"drop.\n",
min / 1024, max / 1024); min / 1024, max / 1024);
FATAL("Suboptimal CPU scaling governor"); FATAL("Suboptimal CPU scaling governor");