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Label /sys/kernel/ns_last_pid as sysctl_kernel_ns_last_pid_t 

CRIU can influence the PID of the threads it wants to create.
CRIU uses /proc/sys/kernel/ns_last_pidto tell the kernel which
PID it wants for the next clone().
So it has to write to that file. This feels like a problematic as
it opens up the container writing to all sysctl_kernel_t.

Using new label container_t will just write to
sysctl_kernel_ns_last_pid_t instad writing to more generic
sysctl_kernel_t files.
This commit is contained in:
Lukas Vrabec 2019-04-10 17:18:32 +02:00 committed by Chris PeBenito
parent beb4a290b0
commit ce570ab34d
2 changed files with 66 additions and 0 deletions
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60
policy/modules/kernel/kernel.if
View File

@ -2150,6 +2150,66 @@ interface(`kernel_mounton_kernel_sysctl_files',`
allow $1 sysctl_kernel_t:file { getattr mounton };
')
########################################
## <summary>
## Read kernel ns lastpid sysctls.
## </summary>
## <param name="domain">
## <summary>
## Domain allowed access.
## </summary>
## </param>
## <rolecap/>
#
interface(`kernel_read_kernel_ns_lastpid_sysctls',`
gen_require(`
type proc_t, sysctl_t, sysctl_kernel_ns_last_pid_t;
')
read_files_pattern($1, { proc_t sysctl_t sysctl_kernel_ns_last_pid_t }, sysctl_kernel_ns_last_pid_t)
list_dirs_pattern($1, { proc_t sysctl_t }, sysctl_kernel_ns_last_pid_t)
')
########################################
## <summary>
## Do not audit attempts to write kernel ns lastpid sysctls.
## </summary>
## <param name="domain">
## <summary>
## Domain to not audit.
## </summary>
## </param>
#
interface(`kernel_dontaudit_write_kernel_ns_lastpid_sysctl',`
gen_require(`
type sysctl_kernel_ns_last_pid_t;
')
dontaudit $1 sysctl_kernel_ns_last_pid_t:file write;
')
########################################
## <summary>
## Read and write kernel ns lastpid sysctls.
## </summary>
## <param name="domain">
## <summary>
## Domain allowed access.
## </summary>
## </param>
## <rolecap/>
#
interface(`kernel_rw_kernel_ns_lastpid_sysctl',`
gen_require(`
type proc_t, sysctl_t, sysctl_kernel_ns_last_pid_t;
')
rw_files_pattern($1, { proc_t sysctl_t sysctl_kernel_ns_last_pid_t }, sysctl_kernel_ns_last_pid_t)
list_dirs_pattern($1, { proc_t sysctl_t }, sysctl_kernel_ns_last_pid_t)
')
########################################
## <summary>
## Search filesystem sysctl directories.

6
policy/modules/kernel/kernel.te
View File

@ -132,6 +132,10 @@ genfscon proc /sys/fs gen_context(system_u:object_r:sysctl_fs_t,s0)
type sysctl_kernel_t, sysctl_type;
genfscon proc /sys/kernel gen_context(system_u:object_r:sysctl_kernel_t,s0)
# /sys/kernel/ns_last_pid file
type sysctl_kernel_ns_last_pid_t, sysctl_type;
genfscon proc /sys/kernel/ns_last_pid gen_context(system_u:object_r:sysctl_kernel_ns_last_pid_t,s0)
# /proc/sys/kernel/modprobe file
type sysctl_modprobe_t, sysctl_type;
genfscon proc /sys/kernel/modprobe gen_context(system_u:object_r:sysctl_modprobe_t,s0)
@ -232,6 +236,8 @@ allow kernel_t sysctl_kernel_t:dir list_dir_perms;
allow kernel_t sysctl_kernel_t:file read_file_perms;
allow kernel_t sysctl_t:dir list_dir_perms;
allow kernel_t sysctl_kernel_ns_last_pid_t:file read_file_perms;
# Other possible mount points for the root fs are in files
allow kernel_t unlabeled_t:dir mounton;
# Kernel-generated traffic e.g., TCP resets on