diff mbox series

[v2] fbdev: defio: fix the pagelist corruption

Message ID 20220318005003.51810-1-chuansheng.liu@intel.com
State Superseded
Headers show
Series [v2] fbdev: defio: fix the pagelist corruption | expand

Commit Message

Liu, Chuansheng March 18, 2022, 12:50 a.m. UTC
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)

Fixes: 105a940416fc ("fbdev/defio: Early-out if page is already
enlisted")
Cc: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Chuansheng Liu <chuansheng.liu@intel.com>
---
 drivers/video/fbdev/core/fb_defio.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

Comments

Thomas Zimmermann March 18, 2022, 7:32 p.m. UTC | #1
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@suse.de>
> Cc: Geert Uytterhoeven <geert@linux-m68k.org>
> Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
> Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
> Signed-off-by: Chuansheng Liu <chuansheng.liu@intel.com>
> ---
>   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);
>
diff mbox series

Patch

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);