diff options
| author | John Johansen <john.johansen@canonical.com> | 2013-02-19 01:05:34 +0100 |
|---|---|---|
| committer | John Johansen <john.johansen@canonical.com> | 2013-04-28 09:36:20 +0200 |
| commit | 7a2871b566f34d980556072943295efd107eb53c (patch) | |
| tree | 7f991bd472872e62780ba9119d8e3a3784008dfc /security | |
| parent | apparmor: add kvzalloc to handle zeroing for kvmalloc (diff) | |
| download | linux-7a2871b566f34d980556072943295efd107eb53c.tar.xz linux-7a2871b566f34d980556072943295efd107eb53c.zip | |
apparmor: use common fn to clear task_context for domain transitions
Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Steve Beattie <sbeattie@ubuntu.com>
Diffstat (limited to 'security')
| -rw-r--r-- | security/apparmor/context.c | 17 | ||||
| -rw-r--r-- | security/apparmor/domain.c | 6 | ||||
| -rw-r--r-- | security/apparmor/include/context.h | 13 |
3 files changed, 20 insertions, 16 deletions
diff --git a/security/apparmor/context.c b/security/apparmor/context.c index 611e6ce70b03..3f911afa2bb9 100644 --- a/security/apparmor/context.c +++ b/security/apparmor/context.c @@ -105,16 +105,12 @@ int aa_replace_current_profile(struct aa_profile *profile) return -ENOMEM; cxt = new->security; - if (unconfined(profile) || (cxt->profile->ns != profile->ns)) { + if (unconfined(profile) || (cxt->profile->ns != profile->ns)) /* if switching to unconfined or a different profile namespace * clear out context state */ - aa_put_profile(cxt->previous); - aa_put_profile(cxt->onexec); - cxt->previous = NULL; - cxt->onexec = NULL; - cxt->token = 0; - } + aa_clear_task_cxt_trans(cxt); + /* be careful switching cxt->profile, when racing replacement it * is possible that cxt->profile->replacedby is the reference keeping * @profile valid, so make sure to get its reference before dropping @@ -222,11 +218,10 @@ int aa_restore_previous_profile(u64 token) aa_get_profile(cxt->profile); aa_put_profile(cxt->previous); } - /* clear exec && prev information when restoring to previous context */ + /* ref has been transfered so avoid putting ref in clear_task_cxt */ cxt->previous = NULL; - cxt->token = 0; - aa_put_profile(cxt->onexec); - cxt->onexec = NULL; + /* clear exec && prev information when restoring to previous context */ + aa_clear_task_cxt_trans(cxt); commit_creds(new); return 0; diff --git a/security/apparmor/domain.c b/security/apparmor/domain.c index fb47d5b71ea6..07fcb09b990f 100644 --- a/security/apparmor/domain.c +++ b/security/apparmor/domain.c @@ -512,11 +512,7 @@ x_clear: cxt->profile = new_profile; /* clear out all temporary/transitional state from the context */ - aa_put_profile(cxt->previous); - aa_put_profile(cxt->onexec); - cxt->previous = NULL; - cxt->onexec = NULL; - cxt->token = 0; + aa_clear_task_cxt_trans(cxt); audit: error = aa_audit_file(profile, &perms, GFP_KERNEL, OP_EXEC, MAY_EXEC, diff --git a/security/apparmor/include/context.h b/security/apparmor/include/context.h index 1e9443a58877..4cecad313227 100644 --- a/security/apparmor/include/context.h +++ b/security/apparmor/include/context.h @@ -160,4 +160,17 @@ static inline struct aa_profile *aa_current_profile(void) return profile; } +/** + * aa_clear_task_cxt_trans - clear transition tracking info from the cxt + * @cxt: task context to clear (NOT NULL) + */ +static inline void aa_clear_task_cxt_trans(struct aa_task_cxt *cxt) +{ + aa_put_profile(cxt->previous); + aa_put_profile(cxt->onexec); + cxt->previous = NULL; + cxt->onexec = NULL; + cxt->token = 0; +} + #endif /* __AA_CONTEXT_H */ |