diff options
| author |   Vinicius Costa Gomes <vinicius.gomes@intel.com> | 2025-04-21 10:03:37 -0700 |
|---|---|---|
| committer |   Vinod Koul <vkoul@kernel.org> | 2025-04-23 17:34:17 +0530 |
| commit | 8dfa57aabff625bf445548257f7711ef294cd30e (patch) | |
| tree | daf11a4980ad76559fb801b96383869a927ab16a /drivers/dma | |
| parent | dmaengine: ti: k3-udma: Add missing locking (diff) | |
| download | linux-rng-8dfa57aabff625bf445548257f7711ef294cd30e.tar.xz linux-rng-8dfa57aabff625bf445548257f7711ef294cd30e.zip | |
dmaengine: idxd: Fix allowing write() from different address spaces
Check if the process submitting the descriptor belongs to the same
address space as the one that opened the file, reject otherwise.
Fixes: 6827738dc684 ("dmaengine: idxd: add a write() method for applications to submit work")
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/20250421170337.3008875-1-dave.jiang@intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/idxd/cdev.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/dma/idxd/cdev.c b/drivers/dma/idxd/cdev.c index 7bd031a60894..a2fb2b847752 100644 --- a/drivers/dma/idxd/cdev.c +++ b/drivers/dma/idxd/cdev.c @@ -407,6 +407,9 @@ static int idxd_cdev_mmap(struct file *filp, struct vm_area_struct *vma) if (!idxd->user_submission_safe && !capable(CAP_SYS_RAWIO)) return -EPERM; + if (current->mm != ctx->mm) + return -EPERM; + rc = check_vma(wq, vma, __func__); if (rc < 0) return rc; @@ -473,6 +476,9 @@ static ssize_t idxd_cdev_write(struct file *filp, const char __user *buf, size_t ssize_t written = 0; int i; + if (current->mm != ctx->mm) + return -EPERM; + for (i = 0; i < len/sizeof(struct dsa_hw_desc); i++) { int rc = idxd_submit_user_descriptor(ctx, udesc + i); @@ -493,6 +499,9 @@ static __poll_t idxd_cdev_poll(struct file *filp, struct idxd_device *idxd = wq->idxd; __poll_t out = 0; + if (current->mm != ctx->mm) + return -EPERM; + poll_wait(filp, &wq->err_queue, wait); spin_lock(&idxd->dev_lock); if (idxd->sw_err.valid) |