Re: [PATCH v2] fbdev: defio: fix the pagelist corruption

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Hi

Am 18.03.22 um 01:50 schrieb Chuansheng Liu:
Easily hit the below list corruption:
==
list_add corruption. prev->next should be next (ffffffffc0ceb090), but
was ffffec604507edc8. (prev=ffffec604507edc8).
WARNING: CPU: 65 PID: 3959 at lib/list_debug.c:26
__list_add_valid+0x53/0x80
CPU: 65 PID: 3959 Comm: fbdev Tainted: G     U
RIP: 0010:__list_add_valid+0x53/0x80
Call Trace:
  <TASK>
  fb_deferred_io_mkwrite+0xea/0x150
  do_page_mkwrite+0x57/0xc0
  do_wp_page+0x278/0x2f0
  __handle_mm_fault+0xdc2/0x1590
  handle_mm_fault+0xdd/0x2c0
  do_user_addr_fault+0x1d3/0x650
  exc_page_fault+0x77/0x180
  ? asm_exc_page_fault+0x8/0x30
  asm_exc_page_fault+0x1e/0x30
RIP: 0033:0x7fd98fc8fad1
==

Figure out the race happens when one process is adding &page->lru into
the pagelist tail in fb_deferred_io_mkwrite(), another process is
re-initializing the same &page->lru in fb_deferred_io_fault(), which is
not protected by the lock.

This fix is to init all the page lists one time during initialization,
it not only fixes the list corruption, but also avoids INIT_LIST_HEAD()
redundantly.

V2: change "int i" to "unsigned int i" (Geert Uytterhoeven)

Thanks a lot. I added to patch to drm-misc-next.

Best regards
Thomas


Fixes: 105a940416fc ("fbdev/defio: Early-out if page is already
enlisted")
Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
Cc: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
Reviewed-by: Javier Martinez Canillas <javierm@xxxxxxxxxx>
Reviewed-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
Signed-off-by: Chuansheng Liu <chuansheng.liu@xxxxxxxxx>
---
  drivers/video/fbdev/core/fb_defio.c | 9 ++++++++-
  1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/core/fb_defio.c b/drivers/video/fbdev/core/fb_defio.c
index 98b0f23bf5e2..a1da54016c88 100644
--- a/drivers/video/fbdev/core/fb_defio.c
+++ b/drivers/video/fbdev/core/fb_defio.c
@@ -59,7 +59,6 @@ static vm_fault_t fb_deferred_io_fault(struct vm_fault *vmf)
  		printk(KERN_ERR "no mapping available\n");
BUG_ON(!page->mapping);
-	INIT_LIST_HEAD(&page->lru);
  	page->index = vmf->pgoff;
vmf->page = page;
@@ -220,6 +219,8 @@ static void fb_deferred_io_work(struct work_struct *work)
  void fb_deferred_io_init(struct fb_info *info)
  {
  	struct fb_deferred_io *fbdefio = info->fbdefio;
+	struct page *page;
+	unsigned int i;
BUG_ON(!fbdefio);
  	mutex_init(&fbdefio->lock);
@@ -227,6 +228,12 @@ void fb_deferred_io_init(struct fb_info *info)
  	INIT_LIST_HEAD(&fbdefio->pagelist);
  	if (fbdefio->delay == 0) /* set a default of 1 s */
  		fbdefio->delay = HZ;
+
+	/* initialize all the page lists one time */
+	for (i = 0; i < info->fix.smem_len; i += PAGE_SIZE) {
+		page = fb_deferred_io_page(info, i);
+		INIT_LIST_HEAD(&page->lru);
+	}
  }
  EXPORT_SYMBOL_GPL(fb_deferred_io_init);

--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev

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