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apparmor: rename context abreviation cxt to the more standard ctx

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Signed-off-by: John Johansen <john.johansen@canonical.com>
This commit is contained in:
John Johansen
2017-01-16 00:43:00 -08:00
parent a20aa95fbe
commit 55a26ebf63
5 changed files with 150 additions and 144 deletions
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100
security/apparmor/context.c
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@@ -13,11 +13,11 @@
* License.
*
*
* AppArmor sets confinement on every task, via the the aa_task_cxt and
* the aa_task_cxt.profile, both of which are required and are not allowed
* to be NULL. The aa_task_cxt is not reference counted and is unique
* AppArmor sets confinement on every task, via the the aa_task_ctx and
* the aa_task_ctx.profile, both of which are required and are not allowed
* to be NULL. The aa_task_ctx is not reference counted and is unique
* to each cred (which is reference count). The profile pointed to by
* the task_cxt is reference counted.
* the task_ctx is reference counted.
*
* TODO
* If a task uses change_hat it currently does not return to the old
@@ -30,28 +30,28 @@
#include "include/policy.h"
/**
* aa_alloc_task_context - allocate a new task_cxt
* aa_alloc_task_context - allocate a new task_ctx
* @flags: gfp flags for allocation
*
* Returns: allocated buffer or NULL on failure
*/
struct aa_task_cxt *aa_alloc_task_context(gfp_t flags)
struct aa_task_ctx *aa_alloc_task_context(gfp_t flags)
{
return kzalloc(sizeof(struct aa_task_cxt), flags);
return kzalloc(sizeof(struct aa_task_ctx), flags);
}
/**
* aa_free_task_context - free a task_cxt
* @cxt: task_cxt to free (MAYBE NULL)
* aa_free_task_context - free a task_ctx
* @ctx: task_ctx to free (MAYBE NULL)
*/
void aa_free_task_context(struct aa_task_cxt *cxt)
void aa_free_task_context(struct aa_task_ctx *ctx)
{
if (cxt) {
aa_put_profile(cxt->profile);
aa_put_profile(cxt->previous);
aa_put_profile(cxt->onexec);
if (ctx) {
aa_put_profile(ctx->profile);
aa_put_profile(ctx->previous);
aa_put_profile(ctx->onexec);
kzfree(cxt);
kzfree(ctx);
}
}
@@ -60,7 +60,7 @@ void aa_free_task_context(struct aa_task_cxt *cxt)
* @new: a blank task context (NOT NULL)
* @old: the task context to copy (NOT NULL)
*/
void aa_dup_task_context(struct aa_task_cxt *new, const struct aa_task_cxt *old)
void aa_dup_task_context(struct aa_task_ctx *new, const struct aa_task_ctx *old)
{
*new = *old;
aa_get_profile(new->profile);
@@ -93,11 +93,11 @@ struct aa_profile *aa_get_task_profile(struct task_struct *task)
*/
int aa_replace_current_profile(struct aa_profile *profile)
{
struct aa_task_cxt *cxt = current_cxt();
struct aa_task_ctx *ctx = current_ctx();
struct cred *new;
BUG_ON(!profile);
if (cxt->profile == profile)
if (ctx->profile == profile)
return 0;
if (current_cred() != current_real_cred())
@@ -107,20 +107,22 @@ int aa_replace_current_profile(struct aa_profile *profile)
if (!new)
return -ENOMEM;
cxt = cred_cxt(new);
if (unconfined(profile) || (cxt->profile->ns != profile->ns))
ctx = cred_ctx(new);
if (unconfined(profile) || (ctx->profile->ns != profile->ns))
/* if switching to unconfined or a different profile namespace
* clear out context state
*/
aa_clear_task_cxt_trans(cxt);
aa_clear_task_ctx_trans(ctx);
/* be careful switching cxt->profile, when racing replacement it
* is possible that cxt->profile->proxy->profile is the reference
/*
* be careful switching ctx->profile, when racing replacement it
* is possible that ctx->profile->proxy->profile is the reference
* keeping @profile valid, so make sure to get its reference before
* dropping the reference on cxt->profile */
* dropping the reference on ctx->profile
*/
aa_get_profile(profile);
aa_put_profile(cxt->profile);
cxt->profile = profile;
aa_put_profile(ctx->profile);
ctx->profile = profile;
commit_creds(new);
return 0;
@@ -134,15 +136,15 @@ int aa_replace_current_profile(struct aa_profile *profile)
*/
int aa_set_current_onexec(struct aa_profile *profile)
{
struct aa_task_cxt *cxt;
struct aa_task_ctx *ctx;
struct cred *new = prepare_creds();
if (!new)
return -ENOMEM;
cxt = cred_cxt(new);
ctx = cred_ctx(new);
aa_get_profile(profile);
aa_put_profile(cxt->onexec);
cxt->onexec = profile;
aa_put_profile(ctx->onexec);
ctx->onexec = profile;
commit_creds(new);
return 0;
@@ -160,28 +162,28 @@ int aa_set_current_onexec(struct aa_profile *profile)
*/
int aa_set_current_hat(struct aa_profile *profile, u64 token)
{
struct aa_task_cxt *cxt;
struct aa_task_ctx *ctx;
struct cred *new = prepare_creds();
if (!new)
return -ENOMEM;
BUG_ON(!profile);
cxt = cred_cxt(new);
if (!cxt->previous) {
ctx = cred_ctx(new);
if (!ctx->previous) {
/* transfer refcount */
cxt->previous = cxt->profile;
cxt->token = token;
} else if (cxt->token == token) {
aa_put_profile(cxt->profile);
ctx->previous = ctx->profile;
ctx->token = token;
} else if (ctx->token == token) {
aa_put_profile(ctx->profile);
} else {
/* previous_profile && cxt->token != token */
/* previous_profile && ctx->token != token */
abort_creds(new);
return -EACCES;
}
cxt->profile = aa_get_newest_profile(profile);
ctx->profile = aa_get_newest_profile(profile);
/* clear exec on switching context */
aa_put_profile(cxt->onexec);
cxt->onexec = NULL;
aa_put_profile(ctx->onexec);
ctx->onexec = NULL;
commit_creds(new);
return 0;
@@ -198,27 +200,27 @@ int aa_set_current_hat(struct aa_profile *profile, u64 token)
*/
int aa_restore_previous_profile(u64 token)
{
struct aa_task_cxt *cxt;
struct aa_task_ctx *ctx;
struct cred *new = prepare_creds();
if (!new)
return -ENOMEM;
cxt = cred_cxt(new);
if (cxt->token != token) {
ctx = cred_ctx(new);
if (ctx->token != token) {
abort_creds(new);
return -EACCES;
}
/* ignore restores when there is no saved profile */
if (!cxt->previous) {
if (!ctx->previous) {
abort_creds(new);
return 0;
}
aa_put_profile(cxt->profile);
cxt->profile = aa_get_newest_profile(cxt->previous);
BUG_ON(!cxt->profile);
aa_put_profile(ctx->profile);
ctx->profile = aa_get_newest_profile(ctx->previous);
AA_BUG(!ctx->profile);
/* clear exec && prev information when restoring to previous context */
aa_clear_task_cxt_trans(cxt);
aa_clear_task_ctx_trans(ctx);
commit_creds(new);
return 0;