Informazioni sul CVE-2024-41094

drm/fbdev-dma: Only set smem_start is enable per module option

CWE ID: N/A

Base Score (CVSS): N/A

CVE: CVE-2024-41094

Descrizione: In the Linux kernel, a vulnerability has been resolved concerning the `drm/fbdev-dma` module. Specifically, the `smem_start` setting is now enabled only when required by the user and the memory is not sourced from vmalloc. This breaks systems where DMA memory is backed by vmalloc addresses. 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 [ 3.677939] drm_fbdev_dma_client_hotplug+0x8c/0xe0 [ 3.700264] drm_client_register+0x60/0xb0 [ 3.705161] drm_fbdev_dma_setup+0x94/0x148 Additionally, DMA memory is assumed to be 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.”

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  • Linux – Linux
  • Linux – Linux

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Produttore:Linux
Prodotto: Linux
Anno: 2024
CWE:
CVSS: 0.0

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