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userns: Make credential debugging user namespace safe. 

Cc: David Howells <dhowells@redhat.com>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2012-04-23 17:06:34 -07:00
parent bc45dae323
commit c9235f4872
2 changed files with 8 additions and 3 deletions
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1
init/Kconfig
View File

@ -936,7 +936,6 @@ config UIDGID_CONVERTED
depends on FS_POSIX_ACL = n
depends on QUOTA = n
depends on QUOTACTL = n
depends on DEBUG_CREDENTIALS = n
depends on BSD_PROCESS_ACCT = n
depends on DRM = n
depends on PROC_EVENTS = n

10
kernel/cred.c
View File

@ -799,9 +799,15 @@ static void dump_invalid_creds(const struct cred *cred, const char *label,
atomic_read(&cred->usage),
read_cred_subscribers(cred));
printk(KERN_ERR "CRED: ->*uid = { %d,%d,%d,%d }\n",
cred->uid, cred->euid, cred->suid, cred->fsuid);
from_kuid_munged(&init_user_ns, cred->uid),
from_kuid_munged(&init_user_ns, cred->euid),
from_kuid_munged(&init_user_ns, cred->suid),
from_kuid_munged(&init_user_ns, cred->fsuid));
printk(KERN_ERR "CRED: ->*gid = { %d,%d,%d,%d }\n",
cred->gid, cred->egid, cred->sgid, cred->fsgid);
from_kgid_munged(&init_user_ns, cred->gid),
from_kgid_munged(&init_user_ns, cred->egid),
from_kgid_munged(&init_user_ns, cred->sgid),
from_kgid_munged(&init_user_ns, cred->fsgid));
#ifdef CONFIG_SECURITY
printk(KERN_ERR "CRED: ->security is %p\n", cred->security);
if ((unsigned long) cred->security >= PAGE_SIZE &&