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gpu: nvgpu: add adequate checks for control-fifo node.

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Add additional checks to prevent users without both READ/WRITE
permissions from opening the control-fifo device node.

Jira NVGPU-8619

Signed-off-by: Debarshi Dutta <ddutta@nvidia.com>
Change-Id: Ie0be0f578c154b45547d5d150ddabaa5936bda80
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2813816
Reviewed-by: svc-mobile-coverity <svc-mobile-coverity@nvidia.com>
Reviewed-by: svc-mobile-cert <svc-mobile-cert@nvidia.com>
Reviewed-by: Prateek Sethi <prsethi@nvidia.com>
Reviewed-by: Vaibhav Kachore <vkachore@nvidia.com>
GVS: Gerrit_Virtual_Submit <buildbot_gerritrpt@nvidia.com>
Tested-by: Prateek Sethi <prsethi@nvidia.com>
This commit is contained in:
Debarshi Dutta
2022-11-22 12:36:32 +05:30
committed by mobile promotions
parent 48ef56104d
commit e583e4a6dc
1 changed files with 6 additions and 0 deletions
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6
drivers/gpu/nvgpu/os/linux/ioctl_nvs.c
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@@ -612,10 +612,16 @@ int nvgpu_nvs_ctrl_fifo_ops_open(struct inode *inode, struct file *filp)
int err = 0;
struct nvgpu_nvs_domain_ctrl_fifo_user_linux *linux_user;
bool writable = filp->f_mode & FMODE_WRITE;
bool readable = filp->f_mode & FMODE_READ;
cdev = container_of(inode->i_cdev, struct nvgpu_cdev, cdev);
g = nvgpu_get_gk20a_from_cdev(cdev);
if (!writable && !readable) {
nvgpu_err(g, "User doesn't have adequate permission to open this device");
return -EOPNOTSUPP;
}
err = gk20a_busy(g);
if (err != 0) {
nvgpu_err(g, "Unable to power on the device");