diff options
| author | Herbert Xu <herbert@gondor.apana.org.au> | 2009-12-01 15:16:22 +0800 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2009-12-01 15:16:22 +0800 |
| commit | 838632438145ac6863377eb12d8b8eef9c55d288 (patch) | |
| tree | fbb0757df837f3c75a99c518a3596c38daef162d /kernel/cred.c | |
| parent | 9996508b3353063f2d6c48c1a28a84543d72d70b (diff) | |
| parent | 29e553631b2a0d4eebd23db630572e1027a9967a (diff) | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'kernel/cred.c')
| -rw-r--r-- | kernel/cred.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/kernel/cred.c b/kernel/cred.c index d7f7a01082e..dd76cfe5f5b 100644 --- a/kernel/cred.c +++ b/kernel/cred.c @@ -782,6 +782,25 @@ EXPORT_SYMBOL(set_create_files_as); #ifdef CONFIG_DEBUG_CREDENTIALS +bool creds_are_invalid(const struct cred *cred) +{ + if (cred->magic != CRED_MAGIC) + return true; + if (atomic_read(&cred->usage) < atomic_read(&cred->subscribers)) + return true; +#ifdef CONFIG_SECURITY_SELINUX + if (selinux_is_enabled()) { + if ((unsigned long) cred->security < PAGE_SIZE) + return true; + if ((*(u32 *)cred->security & 0xffffff00) == + (POISON_FREE << 24 | POISON_FREE << 16 | POISON_FREE << 8)) + return true; + } +#endif + return false; +} +EXPORT_SYMBOL(creds_are_invalid); + /* * dump invalid credentials */ |