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Merge branch 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull locking fixes from Ingo Molnar:
 "Three fixes:

    - Fix an rwsem spin-on-owner crash, introduced in v5.4

    - Fix a lockdep bug when running out of stack_trace entries,
      introduced in v5.4

    - Docbook fix"

* 'locking-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  locking/rwsem: Fix kernel crash when spinning on RWSEM_OWNER_UNKNOWN
  futex: Fix kernel-doc notation warning
  locking/lockdep: Fix buffer overrun problem in stack_trace[]
This commit is contained in:
Linus Torvalds 2020-01-18 12:53:28 -08:00
commit 124b5547ec
3 changed files with 6 additions and 6 deletions
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1
kernel/futex.c
View File

@ -1178,6 +1178,7 @@ out_error:
/**
* wait_for_owner_exiting - Block until the owner has exited
* @ret: owner's current futex lock status
* @exiting: Pointer to the exiting task
*
* Caller must hold a refcount on @exiting.

7
kernel/locking/lockdep.c
View File

@ -482,7 +482,7 @@ static struct lock_trace *save_trace(void)
struct lock_trace *trace, *t2;
struct hlist_head *hash_head;
u32 hash;
unsigned int max_entries;
int max_entries;
BUILD_BUG_ON_NOT_POWER_OF_2(STACK_TRACE_HASH_SIZE);
BUILD_BUG_ON(LOCK_TRACE_SIZE_IN_LONGS >= MAX_STACK_TRACE_ENTRIES);
@ -490,10 +490,8 @@ static struct lock_trace *save_trace(void)
trace = (struct lock_trace *)(stack_trace + nr_stack_trace_entries);
max_entries = MAX_STACK_TRACE_ENTRIES - nr_stack_trace_entries -
LOCK_TRACE_SIZE_IN_LONGS;
trace->nr_entries = stack_trace_save(trace->entries, max_entries, 3);
if (nr_stack_trace_entries >= MAX_STACK_TRACE_ENTRIES -
LOCK_TRACE_SIZE_IN_LONGS - 1) {
if (max_entries <= 0) {
if (!debug_locks_off_graph_unlock())
return NULL;
@ -502,6 +500,7 @@ static struct lock_trace *save_trace(void)
return NULL;
}
trace->nr_entries = stack_trace_save(trace->entries, max_entries, 3);
hash = jhash(trace->entries, trace->nr_entries *
sizeof(trace->entries[0]), 0);

4
kernel/locking/rwsem.c
View File

@ -1226,8 +1226,8 @@ wait:
* In this case, we attempt to acquire the lock again
* without sleeping.
*/
if ((wstate == WRITER_HANDOFF) &&
(rwsem_spin_on_owner(sem, 0) == OWNER_NULL))
if (wstate == WRITER_HANDOFF &&
rwsem_spin_on_owner(sem, RWSEM_NONSPINNABLE) == OWNER_NULL)
goto trylock_again;
/* Block until there are no active lockers. */