diff options
Diffstat (limited to 'meta-agl-devel/meta-agl-jailhouse/recipes-kernel/linux/linux/0010-uio-Enable-read-only-mappings.patch')
| -rw-r--r-- | meta-agl-devel/meta-agl-jailhouse/recipes-kernel/linux/linux/0010-uio-Enable-read-only-mappings.patch | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/meta-agl-devel/meta-agl-jailhouse/recipes-kernel/linux/linux/0010-uio-Enable-read-only-mappings.patch b/meta-agl-devel/meta-agl-jailhouse/recipes-kernel/linux/linux/0010-uio-Enable-read-only-mappings.patch new file mode 100644 index 00000000..2fa65641 --- /dev/null +++ b/meta-agl-devel/meta-agl-jailhouse/recipes-kernel/linux/linux/0010-uio-Enable-read-only-mappings.patch @@ -0,0 +1,57 @@ +From 9c8885c6e020451e4a4578be9db318e5c07227ea Mon Sep 17 00:00:00 2001 +From: Jan Kiszka <jan.kiszka@siemens.com> +Date: Tue, 4 Jun 2019 14:40:09 +0200 +Subject: [PATCH 10/32] uio: Enable read-only mappings + +This allows to tag memory regions read-only, denying userspace to map +them writable. Default remains read/write. + +Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com> +--- + drivers/uio/uio.c | 9 +++++++++ + include/linux/uio_driver.h | 2 ++ + 2 files changed, 11 insertions(+) + +diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c +index a57698985f9c..ac18542ee4fe 100644 +--- a/drivers/uio/uio.c ++++ b/drivers/uio/uio.c +@@ -790,6 +790,15 @@ static int uio_mmap(struct file *filep, struct vm_area_struct *vma) + goto out; + } + ++ if (idev->info->mem[mi].readonly) { ++ if (vma->vm_flags & VM_WRITE) { ++ ret = -EINVAL; ++ goto out; ++ } ++ ++ vma->vm_flags &= ~VM_MAYWRITE; ++ } ++ + if (idev->info->mmap) { + ret = idev->info->mmap(idev->info, vma); + goto out; +diff --git a/include/linux/uio_driver.h b/include/linux/uio_driver.h +index 01081c4726c0..ebfc06e36ca2 100644 +--- a/include/linux/uio_driver.h ++++ b/include/linux/uio_driver.h +@@ -31,6 +31,7 @@ struct uio_map; + * @offs: offset of device memory within the page + * @size: size of IO (multiple of page size) + * @memtype: type of memory addr points to ++ * @readonly: true of region is read-only + * @internal_addr: ioremap-ped version of addr, for driver internal use + * @map: for use by the UIO core only. + */ +@@ -40,6 +41,7 @@ struct uio_mem { + unsigned long offs; + resource_size_t size; + int memtype; ++ bool readonly; + void __iomem *internal_addr; + struct uio_map *map; + }; +-- +2.11.0 + |