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Changbin Du 8f8cd6c0a4 modules: wait do_free_init correctly 
The synchronization here is to ensure the ordering of freeing of a module
init so that it happens before W+X checking.  It is worth noting it is not
that the freeing was not happening, it is just that our sanity checkers
raced against the permission checkers which assume init memory is already
gone.

Commit 1a7b7d9220 ("modules: Use vmalloc special flag") moved calling
do_free_init() into a global workqueue instead of relying on it being
called through call_rcu(..., do_free_init), which used to allowed us call
do_free_init() asynchronously after the end of a subsequent grace period. 
The move to a global workqueue broke the gaurantees for code which needed
to be sure the do_free_init() would complete with rcu_barrier().  To fix
this callers which used to rely on rcu_barrier() must now instead use
flush_work(&init_free_wq).

Without this fix, we still could encounter false positive reports in W+X
checking since the rcu_barrier() here can not ensure the ordering now.

Even worse, the rcu_barrier() can introduce significant delay.  Eric
Chanudet reported that the rcu_barrier introduces ~0.1s delay on a
PREEMPT_RT kernel.

  [    0.291444] Freeing unused kernel memory: 5568K
  [    0.402442] Run /sbin/init as init process

With this fix, the above delay can be eliminated.

Link: https://lkml.kernel.org/r/20240227023546.2490667-1-changbin.du@huawei.com
Fixes: 1a7b7d9220 ("modules: Use vmalloc special flag")
Signed-off-by: Changbin Du <changbin.du@huawei.com>
Tested-by: Eric Chanudet <echanude@redhat.com>
Acked-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Xiaoyi Su <suxiaoyi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-03-04 17:01:27 -08:00
..
debug_kmemleak.c
decompress.c module/decompress: use kvmalloc() consistently 2023-11-02 07:35:39 -10:00
dups.c module: Remove redundant TASK_UNINTERRUPTIBLE 2023-12-19 13:30:28 -08:00
internal.h kbuild: generate KSYMTAB entries by modpost 2023-06-22 21:17:10 +09:00
kallsyms.c modpost, kallsyms: Treat add '$'-prefixed symbols as mapping symbols 2023-07-24 12:09:47 -07:00
Kconfig module: enable automatic module signing with FIPS 202 SHA-3 2023-10-27 18:04:30 +08:00
kdb.c module: replace module_layout with module_memory 2023-03-09 12:55:15 -08:00
kmod.c module: add debugging auto-load duplicate module support 2023-04-19 17:26:01 -07:00
livepatch.c livepatch: fix ELF typos 2023-03-09 11:08:24 +01:00
main.c modules: wait do_free_init correctly 2024-03-04 17:01:27 -08:00
Makefile module: add debugging auto-load duplicate module support 2023-04-19 17:26:01 -07:00
procfs.c module: replace module_layout with module_memory 2023-03-09 12:55:15 -08:00
signing.c
stats.c module: Fix comment typo 2023-11-01 13:07:08 -07:00
strict_rwx.c module: replace module_layout with module_memory 2023-03-09 12:55:15 -08:00
sysfs.c module: Annotate struct module_notes_attrs with __counted_by 2023-11-01 13:07:32 -07:00
tracking.c module: add debug stats to help identify memory pressure 2023-04-18 11:15:24 -07:00
tree_lookup.c module: replace module_layout with module_memory 2023-03-09 12:55:15 -08:00
version.c