linux

mirror of https://github.com/torvalds/linux.git synced 2026-01-12 00:42:35 +08:00

Files

Sebastian Andrzej Siewior 2abf84f688 module: Use RCU in search_module_extables().

search_module_extables() returns an exception_table_entry belonging to a
module. The lookup via __module_address() can be performed with RCU
protection.
The returned exception_table_entry remains valid because the passed
address usually belongs to a module that is currently executed. So the
module can not be removed because "something else" holds a reference to
it, ensuring that it can not be removed.
Exceptions here are:
- kprobe, acquires a reference on the module beforehand
- MCE, invokes the function from within a timer and the RCU lifetime
  guarantees (of the timer) are sufficient.

Therefore it is safe to return the exception_table_entry outside the RCU
section which provided the module.

Use RCU for the lookup in search_module_extables() and update the
comment.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250108090457.512198-14-bigeasy@linutronix.de
Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>

2025-03-10 11:54:45 +01:00

debug_kmemleak.c

module: prepare to handle ROX allocations for text

2024-11-07 14:25:15 -08:00

decompress.c

…

dups.c

remove pointless includes of <linux/fdtable.h>

2024-10-07 13:34:41 -04:00

internal.h

module: Allow __module_address() to be called from RCU section.

2025-03-10 11:54:45 +01:00