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| author | Sebastian Andrzej Siewior <bigeasy@linutronix.de> | 2025-01-08 10:04:30 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-02-08 10:02:06 +0100 |
| commit | 78cf26ebe662838864fe83f6f50c129930770f8f (patch) | |
| tree | baa0984949e95e159dc6797a2bcfa523de69385a | |
| parent | 7cb6f64d7c1ecec52ecdedc8f6126ea8b4c420cf (diff) | |
| download | linux-78cf26ebe662838864fe83f6f50c129930770f8f.tar.gz linux-78cf26ebe662838864fe83f6f50c129930770f8f.tar.bz2 linux-78cf26ebe662838864fe83f6f50c129930770f8f.zip | |
module: Extend the preempt disabled section in dereference_symbol_descriptor().
[ Upstream commit a145c848d69f9c6f32008d8319edaa133360dd74 ]
dereference_symbol_descriptor() needs to obtain the module pointer
belonging to pointer in order to resolve that pointer.
The returned mod pointer is obtained under RCU-sched/ preempt_disable()
guarantees and needs to be used within this section to ensure that the
module is not removed in the meantime.
Extend the preempt_disable() section to also cover
dereference_module_function_descriptor().
Fixes: 04b8eb7a4ccd9 ("symbol lookup: introduce dereference_symbol_descriptor()")
Cc: James E.J. Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Helge Deller <deller@gmx.de>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Naveen N Rao <naveen@kernel.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: linux-parisc@vger.kernel.org
Cc: linuxppc-dev@lists.ozlabs.org
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20250108090457.512198-2-bigeasy@linutronix.de
Signed-off-by: Petr Pavlu <petr.pavlu@suse.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | include/linux/kallsyms.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/kallsyms.h b/include/linux/kallsyms.h index c3f075e8f60c..1c6a6c1704d8 100644 --- a/include/linux/kallsyms.h +++ b/include/linux/kallsyms.h @@ -57,10 +57,10 @@ static inline void *dereference_symbol_descriptor(void *ptr) preempt_disable(); mod = __module_address((unsigned long)ptr); - preempt_enable(); if (mod) ptr = dereference_module_function_descriptor(mod, ptr); + preempt_enable(); #endif return ptr; } |