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authorStephen Smalley <sds@tycho.nsa.gov>2005-04-18 10:47:35 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-18 10:47:35 -0700
commit219f0817038cabc722968e914490adf6b686499e (patch)
tree13b64537abe906645ee22843e146e21958236219 /security
parent865108d13801d39ec038bdc82b5bec5e1eaffa9d (diff)
[PATCH] SELinux: fix deadlock on dcache lock
This fixes a deadlock on the dcache lock detected during testing at IBM by moving the logging of the current executable information from the SELinux avc_audit function to audit_log_exit (via an audit_log_task_info helper) for processing upon syscall exit. For consistency, the patch also removes the logging of other task-related information from avc_audit, deferring handling to audit_log_exit instead. This allows simplification of the avc_audit code, allows the exe information to be obtained more reliably, always includes the comm information (useful for scripts), and avoids including bogus task information for checks performed from irq or softirq. Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@redhat.com> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'security')
-rw-r--r--security/selinux/avc.c34
1 files changed, 0 insertions, 34 deletions
diff --git a/security/selinux/avc.c b/security/selinux/avc.c
index fe6285e5c68f..85a6f66a873f 100644
--- a/security/selinux/avc.c
+++ b/security/selinux/avc.c
@@ -532,7 +532,6 @@ void avc_audit(u32 ssid, u32 tsid,
u16 tclass, u32 requested,
struct av_decision *avd, int result, struct avc_audit_data *a)
{
- struct task_struct *tsk = current;
struct inode *inode = NULL;
u32 denied, audited;
struct audit_buffer *ab;
@@ -556,39 +555,6 @@ void avc_audit(u32 ssid, u32 tsid,
audit_log_format(ab, "avc: %s ", denied ? "denied" : "granted");
avc_dump_av(ab, tclass,audited);
audit_log_format(ab, " for ");
- if (a && a->tsk)
- tsk = a->tsk;
- if (tsk && tsk->pid) {
- struct mm_struct *mm;
- struct vm_area_struct *vma;
- audit_log_format(ab, " pid=%d", tsk->pid);
- if (tsk == current)
- mm = current->mm;
- else
- mm = get_task_mm(tsk);
- if (mm) {
- if (down_read_trylock(&mm->mmap_sem)) {
- vma = mm->mmap;
- while (vma) {
- if ((vma->vm_flags & VM_EXECUTABLE) &&
- vma->vm_file) {
- audit_log_d_path(ab, "exe=",
- vma->vm_file->f_dentry,
- vma->vm_file->f_vfsmnt);
- break;
- }
- vma = vma->vm_next;
- }
- up_read(&mm->mmap_sem);
- } else {
- audit_log_format(ab, " comm=%s", tsk->comm);
- }
- if (tsk != current)
- mmput(mm);
- } else {
- audit_log_format(ab, " comm=%s", tsk->comm);
- }
- }
if (a) {
switch (a->type) {
case AVC_AUDIT_DATA_IPC:

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