Steven Rostedt f0ece16ffc eventfs: Use children field for rcu head and add memory barriers ... When an eventfs inode is freed, it sets ei->is_freed and then uses its ei->list to add it to the srcu link list as the list field is a union with the rcu list head. As the ei->list is used to iterate over an SRCU protected list without taking the eventfs_mutex, there's nothing stopping the iteration over that list to see the ei->rcu instead of the ei->list and it will read a corrupt target. To fix this, change the union of the rcu list head with the children list. On freeing the eventfs inode, set the is_free and execute a smp_wmb() before adding the eventfs inode to the SRCU list. On iteration of the ei->children list, at the start, execute a smp_rmb() and then read the is_freed of the ei to see if the children list is still valid. If is_freed is set, then the ei_child read is not valid and the loop should exit immediately. Cc: stable@vger.kernel.org Link: https://patch.msgid.link/20260808094215.4252430d@robin Fixes: 704f960dbe ("eventfs: Read ei->entries before ei->children in eventfs_iterate()") Reported-by: Sashiko <sashiko-bot@kernel.org> Closes: https://sashiko.dev/#/patchset/20260806022719.375354-1-shuangpeng.kernel%40gmail.com Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>		2026-08-08 10:36:05 -04:00
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event_inode.c	eventfs: Use children field for rcu head and add memory barriers	2026-08-08 10:36:05 -04:00
inode.c	tracefs fixes for v7.1:	2026-04-22 15:09:01 -07:00
internal.h	eventfs: Use children field for rcu head and add memory barriers	2026-08-08 10:36:05 -04:00
Makefile	eventfs: Implement eventfs dir creation functions	2023-07-30 18:13:33 -04:00