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apparmor: move task related defines and fns to task.X files 

Signed-off-by: John Johansen <john.johansen@canonical.com>
This commit is contained in:
John Johansen 2017-10-08 00:43:02 -07:00
parent d065f2f565
commit de62de59c2
6 changed files with 105 additions and 98 deletions
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2
security/apparmor/Makefile
View File

@ -3,7 +3,7 @@
#
obj-$(CONFIG_SECURITY_APPARMOR) += apparmor.o
apparmor-y := apparmorfs.o audit.o capability.o context.o ipc.o lib.o match.o \
apparmor-y := apparmorfs.o audit.o capability.o task.o ipc.o lib.o match.o \
path.o domain.o policy.o policy_unpack.o procattr.o lsm.o \
resource.o secid.o file.o policy_ns.o label.o mount.o
apparmor-$(CONFIG_SECURITY_APPARMOR_HASH) += crypto.o

4
security/apparmor/domain.c
View File

@ -794,7 +794,7 @@ int apparmor_bprm_set_creds(struct linux_binprm *bprm)
if (bprm->called_set_creds)
return 0;
ctx = current_task_ctx();
ctx = task_ctx(current);
AA_BUG(!cred_label(bprm->cred));
AA_BUG(!ctx);
@ -1067,7 +1067,7 @@ int aa_change_hat(const char *hats[], int count, u64 token, int flags)
/* released below */
cred = get_current_cred();
ctx = current_task_ctx();
ctx = task_ctx(current);
label = aa_get_newest_cred_label(cred);
previous = aa_get_newest_label(ctx->previous);

40
security/apparmor/include/context.h
View File

@ -21,33 +21,10 @@
#include "label.h"
#include "policy_ns.h"
#include "task.h"
#define task_ctx(X) ((X)->security)
#define current_task_ctx() (task_ctx(current))
#define cred_label(X) ((X)->security)
/*
* struct aa_task_ctx - information for current task label change
* @onexec: profile to transition to on next exec (MAY BE NULL)
* @previous: profile the task may return to (MAY BE NULL)
* @token: magic value the task must know for returning to @previous_profile
*/
struct aa_task_ctx {
struct aa_label *onexec;
struct aa_label *previous;
u64 token;
};
struct aa_task_ctx *aa_alloc_task_ctx(gfp_t flags);
void aa_free_task_ctx(struct aa_task_ctx *ctx);
void aa_dup_task_ctx(struct aa_task_ctx *new, const struct aa_task_ctx *old);
int aa_replace_current_label(struct aa_label *label);
int aa_set_current_onexec(struct aa_label *label, bool stack);
int aa_set_current_hat(struct aa_label *label, u64 token);
int aa_restore_previous_label(u64 cookie);
struct aa_label *aa_get_task_label(struct task_struct *task);
/**
* aa_cred_raw_label - obtain cred's label
@ -196,19 +173,4 @@ static inline struct aa_ns *aa_get_current_ns(void)
return ns;
}
/**
* aa_clear_task_ctx_trans - clear transition tracking info from the ctx
* @ctx: task context to clear (NOT NULL)
*/
static inline void aa_clear_task_ctx_trans(struct aa_task_ctx *ctx)
{
AA_BUG(!ctx);
aa_put_label(ctx->previous);
aa_put_label(ctx->onexec);
ctx->previous = NULL;
ctx->onexec = NULL;
ctx->token = 0;
}
#endif /* __AA_CONTEXT_H */

90
security/apparmor/include/task.h Normal file
View File

@ -0,0 +1,90 @@
/*
* AppArmor security module
*
* This file contains AppArmor task related definitions and mediation
*
* Copyright 2017 Canonical Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2 of the
* License.
*/
#ifndef __AA_TASK_H
#define __AA_TASK_H
#define task_ctx(X) ((X)->security)
/*
* struct aa_task_ctx - information for current task label change
* @onexec: profile to transition to on next exec (MAY BE NULL)
* @previous: profile the task may return to (MAY BE NULL)
* @token: magic value the task must know for returning to @previous_profile
*/
struct aa_task_ctx {
struct aa_label *onexec;
struct aa_label *previous;
u64 token;
};
int aa_replace_current_label(struct aa_label *label);
int aa_set_current_onexec(struct aa_label *label, bool stack);
int aa_set_current_hat(struct aa_label *label, u64 token);
int aa_restore_previous_label(u64 cookie);
struct aa_label *aa_get_task_label(struct task_struct *task);
/**
* aa_alloc_task_ctx - allocate a new task_ctx
* @flags: gfp flags for allocation
*
* Returns: allocated buffer or NULL on failure
*/
static inline struct aa_task_ctx *aa_alloc_task_ctx(gfp_t flags)
{
return kzalloc(sizeof(struct aa_task_ctx), flags);
}
/**
* aa_free_task_ctx - free a task_ctx
* @ctx: task_ctx to free (MAYBE NULL)
*/
static inline void aa_free_task_ctx(struct aa_task_ctx *ctx)
{
if (ctx) {
aa_put_label(ctx->previous);
aa_put_label(ctx->onexec);
kzfree(ctx);
}
}
/**
* aa_dup_task_ctx - duplicate a task context, incrementing reference counts
* @new: a blank task context (NOT NULL)
* @old: the task context to copy (NOT NULL)
*/
static inline void aa_dup_task_ctx(struct aa_task_ctx *new,
const struct aa_task_ctx *old)
{
*new = *old;
aa_get_label(new->previous);
aa_get_label(new->onexec);
}
/**
* aa_clear_task_ctx_trans - clear transition tracking info from the ctx
* @ctx: task context to clear (NOT NULL)
*/
static inline void aa_clear_task_ctx_trans(struct aa_task_ctx *ctx)
{
AA_BUG(!ctx);
aa_put_label(ctx->previous);
aa_put_label(ctx->onexec);
ctx->previous = NULL;
ctx->onexec = NULL;
ctx->token = 0;
}
#endif /* __AA_TASK_H */

6
security/apparmor/lsm.c
View File

@ -101,7 +101,7 @@ static int apparmor_task_alloc(struct task_struct *task,
if (!new)
return -ENOMEM;
aa_dup_task_ctx(new, current_task_ctx());
aa_dup_task_ctx(new, task_ctx(current));
task_ctx(task) = new;
return 0;
@ -582,7 +582,7 @@ static int apparmor_getprocattr(struct task_struct *task, char *name,
int error = -ENOENT;
/* released below */
const struct cred *cred = get_task_cred(task);
struct aa_task_ctx *ctx = current_task_ctx();
struct aa_task_ctx *ctx = task_ctx(current);
struct aa_label *label = NULL;
if (strcmp(name, "current") == 0)
@ -705,7 +705,7 @@ static void apparmor_bprm_committing_creds(struct linux_binprm *bprm)
static void apparmor_bprm_committed_creds(struct linux_binprm *bprm)
{
/* clear out temporary/transitional state from the context */
aa_clear_task_ctx_trans(current_task_ctx());
aa_clear_task_ctx_trans(task_ctx(current));
return;
}

61
security/apparmor/context.c → security/apparmor/task.c
View File

@ -1,32 +1,23 @@
/*
* AppArmor security module
*
* This file contains AppArmor functions used to manipulate object security
* contexts.
* This file contains AppArmor task related definitions and mediation
*
* Copyright (C) 1998-2008 Novell/SUSE
* Copyright 2009-2010 Canonical Ltd.
* Copyright 2017 Canonical Ltd.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation, version 2 of the
* License.
*
*
* AppArmor sets confinement on every task, via the cred_label() which
* is required and are not allowed to be NULL. The cred_label is
* reference counted.
*
* TODO
* If a task uses change_hat it currently does not return to the old
* cred or task context but instead creates a new one. Ideally the task
* should return to the previous cred if it has not been modified.
*
*/
#include "include/context.h"
#include "include/policy.h"
#include "include/task.h"
/**
* aa_get_task_label - Get another task's label
@ -45,43 +36,6 @@ struct aa_label *aa_get_task_label(struct task_struct *task)
return p;
}
/**
* aa_alloc_task_ctx - allocate a new task_ctx
* @flags: gfp flags for allocation
*
* Returns: allocated buffer or NULL on failure
*/
struct aa_task_ctx *aa_alloc_task_ctx(gfp_t flags)
{
return kzalloc(sizeof(struct aa_task_ctx), flags);
}
/**
* aa_free_task_ctx - free a task_ctx
* @ctx: task_ctx to free (MAYBE NULL)
*/
void aa_free_task_ctx(struct aa_task_ctx *ctx)
{
if (ctx) {
aa_put_label(ctx->previous);
aa_put_label(ctx->onexec);
kzfree(ctx);
}
}
/**
* aa_dup_task_ctx - duplicate a task context, incrementing reference counts
* @new: a blank task context (NOT NULL)
* @old: the task context to copy (NOT NULL)
*/
void aa_dup_task_ctx(struct aa_task_ctx *new, const struct aa_task_ctx *old)
{
*new = *old;
aa_get_label(new->previous);
aa_get_label(new->onexec);
}
/**
* aa_replace_current_label - replace the current tasks label
* @label: new label (NOT NULL)
@ -110,7 +64,7 @@ int aa_replace_current_label(struct aa_label *label)
* if switching to unconfined or a different label namespace
* clear out context state
*/
aa_clear_task_ctx_trans(current_task_ctx());
aa_clear_task_ctx_trans(task_ctx(current));
/*
* be careful switching cred label, when racing replacement it
@ -126,6 +80,7 @@ int aa_replace_current_label(struct aa_label *label)
return 0;
}
/**
* aa_set_current_onexec - set the tasks change_profile to happen onexec
* @label: system label to set at exec (MAYBE NULL to clear value)
@ -134,7 +89,7 @@ int aa_replace_current_label(struct aa_label *label)
*/
int aa_set_current_onexec(struct aa_label *label, bool stack)
{
struct aa_task_ctx *ctx = current_task_ctx();
struct aa_task_ctx *ctx = task_ctx(current);
aa_get_label(label);
aa_put_label(ctx->onexec);
@ -156,7 +111,7 @@ int aa_set_current_onexec(struct aa_label *label, bool stack)
*/
int aa_set_current_hat(struct aa_label *label, u64 token)
{
struct aa_task_ctx *ctx = current_task_ctx();
struct aa_task_ctx *ctx = task_ctx(current);
struct cred *new;
new = prepare_creds();
@ -196,7 +151,7 @@ int aa_set_current_hat(struct aa_label *label, u64 token)
*/
int aa_restore_previous_label(u64 token)
{
struct aa_task_ctx *ctx = current_task_ctx();
struct aa_task_ctx *ctx = task_ctx(current);
struct cred *new;
if (ctx->token != token)