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dma-buf/sw-sync: always taint the kernel when sw-sync is used

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The SW-sync functionality should only be used for testing and debugging
since it is inherently unsave.

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: https://lore.kernel.org/r/20251120150018.27385-3-christian.koenig@amd.com
This commit is contained in:
Christian König
2025-11-20 15:41:08 +01:00
committed by Christian König
parent 0a8bc1d03e
commit 17331d0f33
1 changed files with 4 additions and 0 deletions
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4
drivers/dma-buf/sw_sync.c
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@@ -8,6 +8,7 @@
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/panic.h>
#include <linux/slab.h>
#include <linux/sync_file.h>
@@ -349,6 +350,9 @@ static long sw_sync_ioctl_create_fence(struct sync_timeline *obj,
struct sync_file *sync_file;
struct sw_sync_create_fence_data data;
/* SW sync fence are inherently unsafe and can deadlock the kernel */
add_taint(TAINT_SOFTLOCKUP, LOCKDEP_STILL_OK);
if (fd < 0)
return fd;