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mm: assert mmap write lock held on do_mmap(), mmap_region()

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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.

Link: https://lkml.kernel.org/r/20241212114841.55185-1-lorenzo.stoakes@oracle.com
Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Jann Horn <jannh@google.com>
Cc: Liam R. Howlett <Liam.Howlett@Oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Lorenzo Stoakes 2024-12-12 11:48:41 +00:00 committed by Andrew Morton
parent 5d45ba8c71
commit df31155aff
1 changed files with 4 additions and 0 deletions
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4
mm/mmap.c
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@ -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;