diff options
Diffstat (limited to 'mm/madvise.c')
| -rw-r--r-- | mm/madvise.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/mm/madvise.c b/mm/madvise.c index c8ba3f3eb54d..a77893462b92 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -1401,6 +1401,7 @@ int madvise_set_anon_name(struct mm_struct *mm, unsigned long start, * -EIO - an I/O error occurred while paging in data. * -EBADF - map exists, but area maps something that isn't a file. * -EAGAIN - a kernel resource was temporarily unavailable. + * -EPERM - memory is sealed. */ int do_madvise(struct mm_struct *mm, unsigned long start, size_t len_in, int behavior) { @@ -1444,6 +1445,15 @@ int do_madvise(struct mm_struct *mm, unsigned long start, size_t len_in, int beh start = untagged_addr_remote(mm, start); end = start + len; + /* + * Check if the address range is sealed for do_madvise(). + * can_modify_mm_madv assumes we have acquired the lock on MM. + */ + if (unlikely(!can_modify_mm_madv(mm, start, end, behavior))) { + error = -EPERM; + goto out; + } + blk_start_plug(&plug); switch (behavior) { case MADV_POPULATE_READ: @@ -1456,6 +1466,8 @@ int do_madvise(struct mm_struct *mm, unsigned long start, size_t len_in, int beh break; } blk_finish_plug(&plug); + +out: if (write) mmap_write_unlock(mm); else |