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author | Peter Zijlstra <peterz@infradead.org> | 2015-08-20 10:34:59 +0930 |
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committer | Sasha Levin <sasha.levin@oracle.com> | 2015-11-15 12:51:51 -0500 |
commit | c07366111728efd1260452ef094c0a64d9c40f93 (patch) | |
tree | 11d8255bd692c256846296532c35c3673f0bee60 /kernel | |
parent | ff6f66f679e83d69c869de459dad3bc0f4783c63 (diff) | |
download | lwn-c07366111728efd1260452ef094c0a64d9c40f93.tar.gz lwn-c07366111728efd1260452ef094c0a64d9c40f93.zip |
module: Fix locking in symbol_put_addr()
[ Upstream commit 275d7d44d802ef271a42dc87ac091a495ba72fc5 ]
Poma (on the way to another bug) reported an assertion triggering:
[<ffffffff81150529>] module_assert_mutex_or_preempt+0x49/0x90
[<ffffffff81150822>] __module_address+0x32/0x150
[<ffffffff81150956>] __module_text_address+0x16/0x70
[<ffffffff81150f19>] symbol_put_addr+0x29/0x40
[<ffffffffa04b77ad>] dvb_frontend_detach+0x7d/0x90 [dvb_core]
Laura Abbott <labbott@redhat.com> produced a patch which lead us to
inspect symbol_put_addr(). This function has a comment claiming it
doesn't need to disable preemption around the module lookup
because it holds a reference to the module it wants to find, which
therefore cannot go away.
This is wrong (and a false optimization too, preempt_disable() is really
rather cheap, and I doubt any of this is on uber critical paths,
otherwise it would've retained a pointer to the actual module anyway and
avoided the second lookup).
While its true that the module cannot go away while we hold a reference
on it, the data structure we do the lookup in very much _CAN_ change
while we do the lookup. Therefore fix the comment and add the
required preempt_disable().
Reported-by: poma <pomidorabelisima@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Fixes: a6e6abd575fc ("module: remove module_text_address()")
Cc: stable@kernel.org
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/module.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/kernel/module.c b/kernel/module.c index c353707bbbd5..3da0c001d985 100644 --- a/kernel/module.c +++ b/kernel/module.c @@ -914,11 +914,15 @@ void symbol_put_addr(void *addr) if (core_kernel_text(a)) return; - /* module_text_address is safe here: we're supposed to have reference - * to module from symbol_get, so it can't go away. */ + /* + * Even though we hold a reference on the module; we still need to + * disable preemption in order to safely traverse the data structure. + */ + preempt_disable(); modaddr = __module_text_address(a); BUG_ON(!modaddr); module_put(modaddr); + preempt_enable(); } EXPORT_SYMBOL_GPL(symbol_put_addr); |