mirror of https://github.com/torvalds/linux.git
2e68039281
- Use list_add_tail_rcu() for walking eventfs children The children link list is protected by SRCU and list walkers can walk the list with only using SRCU. Using just list_add_tail() on weakly ordered architectures can cause issues. Instead use list_add_tail_rcu(). - Hold eventfs_mutex and SRCU for remount walk events The trace_apply_options() walks the tracefs_inodes where some are eventfs inodes and eventfs_remount() is called which in turn calls eventfs_set_attr(). This walk only holds normal RCU read locks, but the eventfs_mutex and SRCU should be held. Add a eventfs_remount_(un)lock() helpers to take the necessary locks before iterating the list. -----BEGIN PGP SIGNATURE----- iIoEABYKADIWIQRRSw7ePDh/lE+zeZMp5XQQmuv6qgUCaekrdRQccm9zdGVkdEBn b29kbWlzLm9yZwAKCRAp5XQQmuv6ql43AP9evY7U3aOAfPV9Zz6UEZe37Px4rDf5 7R8Udq3BxI4c0AEArooS0KILZsWnGYFfgq2KbJM4Wq4j5xHcj9VBp95WvQM= =1RCW -----END PGP SIGNATURE----- Merge tag 'tracefs-v7.1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull tracefs fixes from Steven Rostedt: - Use list_add_tail_rcu() for walking eventfs children The linked list of children is protected by SRCU and list walkers can walk the list with only using SRCU. Using just list_add_tail() on weakly ordered architectures can cause issues. Instead use list_add_tail_rcu(). - Hold eventfs_mutex and SRCU for remount walk events The trace_apply_options() walks the tracefs_inodes where some are eventfs inodes and eventfs_remount() is called which in turn calls eventfs_set_attr(). This walk only holds normal RCU read locks, but the eventfs_mutex and SRCU should be held. Add a eventfs_remount_(un)lock() helpers to take the necessary locks before iterating the list. * tag 'tracefs-v7.1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: eventfs: Hold eventfs_mutex and SRCU when remount walks events eventfs: Use list_add_tail_rcu() for SRCU-protected children list |
||
|---|---|---|
| .. | ||
| Makefile | ||
| event_inode.c | ||
| inode.c | ||
| internal.h | ||