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CRED: Separate task security context from task_struct

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Separate the task security context from task_struct.  At this point, the
security data is temporarily embedded in the task_struct with two pointers
pointing to it.

Note that the Alpha arch is altered as it refers to (E)UID and (E)GID in
entry.S via asm-offsets.

With comment fixes Signed-off-by: Marc Dionne <marc.c.dionne@gmail.com>

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: James Morris <jmorris@namei.org>
Acked-by: Serge Hallyn <serue@us.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
This commit is contained in:
David Howells
2008-11-14 10:39:16 +11:00
committed by James Morris
parent 15a2460ed0
commit b6dff3ec5e
63 changed files with 830 additions and 675 deletions
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kernel/ptrace.c
+10 -9
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@@ -115,6 +115,8 @@ int ptrace_check_attach(struct task_struct *child, int kill)
int __ptrace_may_access(struct task_struct *task, unsigned int mode)
{
struct cred *cred = current->cred, *tcred = task->cred;
/* May we inspect the given task?
* This check is used both for attaching with ptrace
* and for allowing access to sensitive information in /proc.
@@ -123,19 +125,18 @@ int __ptrace_may_access(struct task_struct *task, unsigned int mode)
* because setting up the necessary parent/child relationship
* or halting the specified task is impossible.
*/
uid_t uid;
gid_t gid;
uid_t uid = cred->uid;
gid_t gid = cred->gid;
int dumpable = 0;
/* Don't let security modules deny introspection */
if (task == current)
return 0;
current_uid_gid(&uid, &gid);
if ((uid != task->euid ||
uid != task->suid ||
uid != task->uid ||
gid != task->egid ||
gid != task->sgid ||
gid != task->gid) && !capable(CAP_SYS_PTRACE))
if ((uid != tcred->euid ||
uid != tcred->suid ||
uid != tcred->uid ||
gid != tcred->egid ||
gid != tcred->sgid ||
gid != tcred->gid) && !capable(CAP_SYS_PTRACE))
return -EPERM;
smp_rmb();
if (task->mm)