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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000013, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Both of these functions can be invoked outside of mm, so it is probably a good idea to assert that the required lock is held. Will only have an impact if CONFIG_DEBUG_VM is set, otherwise this amounts to no change at all. Signed-off-by: Lorenzo Stoakes --- mm/mmap.c | 4 ++++ 1 file changed, 4 insertions(+) -- 2.47.1 diff --git a/mm/mmap.c b/mm/mmap.c index df9154b15ef9..43ef85028921 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -291,6 +291,8 @@ unsigned long do_mmap(struct file *file, unsigned long addr, *populate = 0; + mmap_assert_write_locked(mm); + if (!len) return -EINVAL; @@ -1023,6 +1025,8 @@ unsigned long mmap_region(struct file *file, unsigned long addr, unsigned long ret; bool writable_file_mapping = false; + mmap_assert_write_locked(current->mm); + /* Check to see if MDWE is applicable. */ if (map_deny_write_exec(vm_flags, vm_flags)) return -EACCES;