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selinux: randomize layout of key structures

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Randomize the layout of key selinux data structures.
Initially this is applied to the selinux_state, selinux_ss,
policydb, and task_security_struct data structures.

NB To test/use this mechanism, one must install the
necessary build-time dependencies, e.g. gcc-plugin-devel on Fedora,
and enable CONFIG_GCC_PLUGIN_RANDSTRUCT in the kernel configuration.

Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Reviewed-by: Kees Cook <keescook@chromium.org>
[PM: double semi-colon fixed]
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Stephen Smalley 2019-12-13 15:28:38 -05:00 committed by Paul Moore
parent 6c5a682e64
commit 5c108d4e18
4 changed files with 4 additions and 4 deletions
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2
security/selinux/include/objsec.h
View File

@ -35,7 +35,7 @@ struct task_security_struct {
u32 create_sid; /* fscreate SID */
u32 keycreate_sid; /* keycreate SID */
u32 sockcreate_sid; /* fscreate SID */
};
} __randomize_layout;
enum label_initialized {
LABEL_INVALID, /* invalid or not initialized */

2
security/selinux/include/security.h
View File

@ -110,7 +110,7 @@ struct selinux_state {
bool policycap[__POLICYDB_CAPABILITY_MAX];
struct selinux_avc *avc;
struct selinux_ss *ss;
};
} __randomize_layout;
void selinux_ss_init(struct selinux_ss **ss);
void selinux_avc_init(struct selinux_avc **avc);

2
security/selinux/ss/policydb.h
View File

@ -307,7 +307,7 @@ struct policydb {
u16 process_class;
u32 process_trans_perms;
};
} __randomize_layout;
extern void policydb_destroy(struct policydb *p);
extern int policydb_load_isids(struct policydb *p, struct sidtab *s);

2
security/selinux/ss/services.h
View File

@ -31,7 +31,7 @@ struct selinux_ss {
struct selinux_map map;
struct page *status_page;
struct mutex status_lock;
};
} __randomize_layout;
void services_compute_xperms_drivers(struct extended_perms *xperms,
struct avtab_node *node);