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Revert "Revert "binder_alloc: add missing mmap_lock calls when using the VMA""

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This reverts commit 6802c70090.

It breaks the Android kernel abi, but will be brought in through a
different branch to ensure it ends up in the tree properly.

Bug: 161946584
Change-Id: I62354c3b354cd686e2da92741f6c5ec75b70f667
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Greg Kroah-Hartman
2023-06-15 12:09:00 +00:00
parent 1b16baaf8b
commit 6720675504
1 changed files with 21 additions and 10 deletions
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31
drivers/android/binder_alloc.c
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@@ -395,12 +395,15 @@ static struct binder_buffer *binder_alloc_new_buf_locked(
size_t size, data_offsets_size;
int ret;
mmap_read_lock(alloc->vma_vm_mm);
if (!binder_alloc_get_vma(alloc)) {
mmap_read_unlock(alloc->vma_vm_mm);
binder_alloc_debug(BINDER_DEBUG_USER_ERROR,
"%d: binder_alloc_buf, no vma\n",
alloc->pid);
return ERR_PTR(-ESRCH);
}
mmap_read_unlock(alloc->vma_vm_mm);
data_offsets_size = ALIGN(data_size, sizeof(void *)) +
ALIGN(offsets_size, sizeof(void *));
@@ -929,17 +932,25 @@ void binder_alloc_print_pages(struct seq_file *m,
* Make sure the binder_alloc is fully initialized, otherwise we might
* read inconsistent state.
*/
if (binder_alloc_get_vma(alloc) != NULL) {
for (i = 0; i < alloc->buffer_size / PAGE_SIZE; i++) {
page = &alloc->pages[i];
if (!page->page_ptr)
free++;
else if (list_empty(&page->lru))
active++;
else
lru++;
}
mmap_read_lock(alloc->vma_vm_mm);
if (binder_alloc_get_vma(alloc) == NULL) {
mmap_read_unlock(alloc->vma_vm_mm);
goto uninitialized;
}
mmap_read_unlock(alloc->vma_vm_mm);
for (i = 0; i < alloc->buffer_size / PAGE_SIZE; i++) {
page = &alloc->pages[i];
if (!page->page_ptr)
free++;
else if (list_empty(&page->lru))
active++;
else
lru++;
}
uninitialized:
mutex_unlock(&alloc->mutex);
seq_printf(m, " pages: %d:%d:%d\n", active, lru, free);
seq_printf(m, " pages high watermark: %zu\n", alloc->pages_high);