In the Linux kernel, the following vulnerability has been resolved:
drm/fbdev-dma: Only set smem_start is enable per module option
Only export struct fb_info.fix.smem_start if that is required by the
user and the memory does not come from vmalloc().
Setting struct fb_info.fix.smem_start breaks systems where DMA
memory is backed by vmalloc address space. An example error is
shown below.
[ 3.536043] ------------[ cut here ]------------
[ 3.540716] virt_to_phys used for non-linear address: 000000007fc4f540 (0xffff800086001000)
[ 3.552628] WARNING: CPU: 4 PID: 61 at arch/arm64/mm/physaddr.c:12 __virt_to_phys+0x68/0x98
[ 3.565455] Modules linked in:
[ 3.568525] CPU: 4 PID: 61 Comm: kworker/u12:5 Not tainted 6.6.23-06226-g4986cc3e1b75-dirty #250
[ 3.577310] Hardware name: NXP i.MX95 19X19 board (DT)
[ 3.582452] Workqueue: events_unbound deferred_probe_work_func
[ 3.588291] pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 3.595233] pc : __virt_to_phys+0x68/0x98
[ 3.599246] lr : __virt_to_phys+0x68/0x98
[ 3.603276] sp : ffff800083603990
[ 3.677939] Call trace:
[ 3.680393] __virt_to_phys+0x68/0x98
[ 3.684067] drm_fbdev_dma_helper_fb_probe+0x138/0x238
[ 3.689214] __drm_fb_helper_initial_config_and_unlock+0x2b0/0x4c0
[ 3.695385] drm_fb_helper_initial_config+0x4c/0x68
[ 3.700264] drm_fbdev_dma_client_hotplug+0x8c/0xe0
[ 3.705161] drm_client_register+0x60/0xb0
[ 3.709269] drm_fbdev_dma_setup+0x94/0x148
Additionally, DMA memory is assumed to by contiguous in physical
address space, which is not guaranteed by vmalloc().
Resolve this by checking the module flag drm_leak_fbdev_smem when
DRM allocated the instance of struct fb_info. Fbdev-dma then only
sets smem_start only if required (via FBINFO_HIDE_SMEM_START). Also
guarantee that the framebuffer is not located in vmalloc address
space.
References
Configurations
Configuration 1 (hide)
|
History
22 Aug 2024, 13:15
Type | Values Removed | Values Added |
---|---|---|
CWE | NVD-CWE-noinfo | |
Summary |
|
|
CPE | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | |
CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
First Time |
Linux
Linux linux Kernel |
|
References | () https://git.kernel.org/stable/c/00702cfa8432ac67a72f56de5e1d278ddea2ebde - Patch | |
References | () https://git.kernel.org/stable/c/d92a7580392ad4681b1d4f9275d00b95375ebe01 - Patch | |
References | () https://git.kernel.org/stable/c/f29fcfbf6067c0d8c83f84a045da9276c08deac5 - Patch |
29 Jul 2024, 16:21
Type | Values Removed | Values Added |
---|---|---|
New CVE |
Information
Published : 2024-07-29 16:15
Updated : 2024-08-22 13:15
NVD link : CVE-2024-41094
Mitre link : CVE-2024-41094
CVE.ORG link : CVE-2024-41094
JSON object : View
Products Affected
linux
- linux_kernel
CWE