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| author | Kees Cook <keescook@chromium.org> | 2013-07-08 10:01:32 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-24 22:47:20 -0700 |
| commit | 274a5855c034800b8e9a6ca32bbf81298ae917d8 (patch) | |
| tree | 8e0172fc6630f20746a336d969982b16a6ce5bb2 /drivers/misc/lkdtm.c | |
| parent | 65892723c386d658234ffffa35789e68e0601982 (diff) | |
| download | linux-stable-274a5855c034800b8e9a6ca32bbf81298ae917d8.tar.gz linux-stable-274a5855c034800b8e9a6ca32bbf81298ae917d8.tar.bz2 linux-stable-274a5855c034800b8e9a6ca32bbf81298ae917d8.zip | |
lkdtm: add "SPINLOCKUP" trigger
For additional lockup testing, add "SPINLOCKUP" to trigger a spinlock
deadlock when triggered twice.
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/lkdtm.c')
| -rw-r--r-- | drivers/misc/lkdtm.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/misc/lkdtm.c b/drivers/misc/lkdtm.c index b1323fc881b1..8bc7f0bcd945 100644 --- a/drivers/misc/lkdtm.c +++ b/drivers/misc/lkdtm.c @@ -78,6 +78,7 @@ enum ctype { CT_WRITE_AFTER_FREE, CT_SOFTLOCKUP, CT_HARDLOCKUP, + CT_SPINLOCKUP, CT_HUNG_TASK, }; @@ -106,6 +107,7 @@ static char* cp_type[] = { "WRITE_AFTER_FREE", "SOFTLOCKUP", "HARDLOCKUP", + "SPINLOCKUP", "HUNG_TASK", }; @@ -123,6 +125,7 @@ static enum cname cpoint = CN_INVALID; static enum ctype cptype = CT_NONE; static int count = DEFAULT_COUNT; static DEFINE_SPINLOCK(count_lock); +static DEFINE_SPINLOCK(lock_me_up); module_param(recur_count, int, 0644); MODULE_PARM_DESC(recur_count, " Recursion level for the stack overflow test, "\ @@ -345,6 +348,10 @@ static void lkdtm_do_action(enum ctype which) for (;;) cpu_relax(); break; + case CT_SPINLOCKUP: + /* Must be called twice to trigger. */ + spin_lock(&lock_me_up); + break; case CT_HUNG_TASK: set_current_state(TASK_UNINTERRUPTIBLE); schedule(); |