> In any case while letting it run I got the following OOPS on
> Linux 3.10-rc2
Included below is test code (based on the fuzzer output) that reliably
OOPSes my core2 machine. It's a bit long, but I'm remote from the
machine now so I can't refine it (as the code locked up the machine the
last time I tested).
/* perf_mmap_close_bug.c */
/* By Vince Weaver <vincent.weaver at maine.edu> */
/* compile with "gcc -O2 -Wall -o perf_mmap_close_bug perf_mmap_close_bug.c */
/* This will reliably OOPS my core2 Linux 3.10-rc2 machine */
#include <stdio.h>
#include <linux/perf_event.h>
#include <sys/mman.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/syscall.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
int perf_event_open(struct perf_event_attr *hw_event_uptr,
pid_t pid, int cpu, int group_fd, unsigned long flags) {
return syscall(__NR_perf_event_open,hw_event_uptr, pid, cpu,
group_fd, flags);
}
int main(int argc, char **argv) {
struct perf_event_attr pe1,pe2;
int fd1,fd2;
memset(&pe1,0,sizeof(struct perf_event_attr));
memset(&pe2,0,sizeof(struct perf_event_attr));
pe1.type=0;
pe1.size=0x60;
pe1.config=3;
pe1.sample_type=0x4f0;
pe1.read_format=5;
pe1.exclude_kernel=1;
pe1.bp_type=1;
pe1.config1=0x1d469257;
pe1.config2=2;
fd1=perf_event_open(&pe1,0,0,-1,3);
if (fd1<0) {
fprintf(stderr,"Error opening fd1 %s\n",strerror(errno));
exit(1);
}
mmap(NULL, 69632, PROT_READ|PROT_WRITE, MAP_SHARED, fd1, 0);
ioctl(fd1,PERF_EVENT_IOC_RESET,0);
pe2.type=1;
pe2.size=0x60;
pe2.config=2;
pe2.read_format=3;
pe2.exclusive=1;
pe2.exclude_user=1;
pe2.mmap=1;
pe2.inherit_stat=1;
pe2.enable_on_exec=1;
pe2.task=1;
pe2.watermark=1;
pe2.precise_ip=2;
pe2.sample_id_all=1;
pe2.exclude_guest=1;
pe2.wakeup_events=1500395763;
fd2=perf_event_open(&pe2,0,0,fd1,3);
fd1=perf_event_open(&pe1,0,0,-1,3);
if (fd2<0) {
fprintf(stderr,"Error opening fd2 %s\n",strerror(errno));
exit(1);
}
mmap(NULL, 69632, PROT_READ|PROT_WRITE, MAP_SHARED, fd2, 0);
ioctl(fd1,PERF_EVENT_IOC_ENABLE,0);
ioctl(fd2,PERF_EVENT_IOC_ENABLE,0);
close(fd2);
return 0;
}
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