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| author | Leah Neukirchen <leah@vuxu.org> | 2018-02-08 17:19:54 +0100 |
|---|---|---|
| committer | Leah Neukirchen <leah@vuxu.org> | 2018-02-08 17:19:54 +0100 |
| commit | 9e674ae3108a6811d0783cf81dcf5a3c42324e3b (patch) | |
| tree | d7d5ed42f92dde8a3119c200ae77a608338dfa5a | |
| parent | 3a867c9ba4f41dad6c67a1a08792b358f328c54b (diff) | |
| download | fail-9e674ae3108a6811d0783cf81dcf5a3c42324e3b.tar.gz fail-9e674ae3108a6811d0783cf81dcf5a3c42324e3b.tar.xz fail-9e674ae3108a6811d0783cf81dcf5a3c42324e3b.zip | |
add -b for SIGBUS
| -rw-r--r-- | fail.1 | 8 | ||||
| -rw-r--r-- | fail.c | 21 |
2 files changed, 25 insertions, 4 deletions
diff --git a/fail.1 b/fail.1 index d63ea57..7f959aa 100644 --- a/fail.1 +++ b/fail.1 @@ -1,4 +1,4 @@ -.Dd July 14, 2017 +.Dd February 08, 2017 .Dt FAIL 1 .Os .Sh NAME @@ -6,7 +6,7 @@ .Nd crash in various possible ways .Sh SYNOPSIS .Nm -.Op Fl 123DOacdikrst +.Op Fl 123DOabcdikrst .Sh DESCRIPTION .Nm crashes in various possible ways to @@ -45,6 +45,10 @@ Use with caution. .It Fl a Call .Fn abort . +.It Fl b +Trigger SIGBUS by accessing +.Xr mmap 2 +memory beyond the end of a file. .It Fl c Violate a .Fn seccomp diff --git a/fail.c b/fail.c index 6e986ee..3364763 100644 --- a/fail.c +++ b/fail.c @@ -3,6 +3,7 @@ #include <linux/seccomp.h> #include <sys/auxv.h> +#include <sys/mman.h> #include <sys/prctl.h> #include <sys/ptrace.h> #include <sys/stat.h> @@ -127,12 +128,27 @@ violate_seccomp() chdir("/"); } +void +mmap_sigbus() +{ + int fd = open("/bin/sh", O_RDONLY); + if (fd < 0) + exit(1); + char *m = mmap(0, 10*1024*1024, PROT_READ, MAP_SHARED, fd, 0); + if (m == MAP_FAILED) + exit(1); + + ((volatile char *)m)[9*1024*1024]; + + exit(1); +} + int main(int argc, char *argv[]) { int c; - while ((c = getopt(argc, argv, "123DOacdikrst")) != -1) { + while ((c = getopt(argc, argv, "123DOabcdikrst")) != -1) { switch (c) { case '1': exit(-1); break; case '2': exit(2); break; @@ -140,6 +156,7 @@ main(int argc, char *argv[]) case 'D': uninterruptible(); break; case 'O': oom(); break; case 'a': abortme(); break; + case 'b': mmap_sigbus(); break; case 'c': violate_seccomp(); break; case 'd': divtrap(); break; case 'i': illegalins(); break; @@ -150,6 +167,6 @@ main(int argc, char *argv[]) } } - write(2, "Usage: fail [-123Oacdikrst]\n", 28); + write(2, "Usage: fail [-123Oabcdikrst]\n", 29); exit(1); } |