2020-07-14 13:27:33

by Anthony PERARD

Subject: [PATCH] xen: Allow xenstored to map /proc/xen/xsd_kva

xenstored is using mmap() on /proc/xen/xsd_kva, and when the SELinux
boolean "domain_can_mmap_files" in CentOS is set to false the mmap()
call fails.

Signed-off-by: Anthony PERARD <[email protected]>
---
policy/modules/system/xen.te | 1 +
1 file changed, 1 insertion(+)

diff --git a/policy/modules/system/xen.te b/policy/modules/system/xen.te
index 1b91b5cbc82a..b3df1f627804 100644
--- a/policy/modules/system/xen.te
+++ b/policy/modules/system/xen.te
@@ -459,6 +459,7 @@ files_read_usr_files(xenstored_t)

fs_search_xenfs(xenstored_t)
fs_manage_xenfs_files(xenstored_t)
+allow xenstored_t xenfs_t:file map;

term_use_generic_ptys(xenstored_t)

--
Anthony PERARD

2020-07-16 13:37:23

by Chris PeBenito

Subject: Re: [PATCH] xen: Allow xenstored to map /proc/xen/xsd_kva

On 7/14/20 9:20 AM, Anthony PERARD wrote:
> xenstored is using mmap() on /proc/xen/xsd_kva, and when the SELinux
> boolean "domain_can_mmap_files" in CentOS is set to false the mmap()
> call fails.
>
> Signed-off-by: Anthony PERARD <[email protected]>
> ---
> policy/modules/system/xen.te | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/policy/modules/system/xen.te b/policy/modules/system/xen.te
> index 1b91b5cbc82a..b3df1f627804 100644
> --- a/policy/modules/system/xen.te
> +++ b/policy/modules/system/xen.te
> @@ -459,6 +459,7 @@ files_read_usr_files(xenstored_t)
>
> fs_search_xenfs(xenstored_t)
> fs_manage_xenfs_files(xenstored_t)
> +allow xenstored_t xenfs_t:file map;
>
> term_use_generic_ptys(xenstored_t)

You need to add an interface in filesystem.if that allows the caller to map
xenfs files and call it from xen.te.

--
Chris PeBenito