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[PATCH] deal with deadlocks in audit_free() 

Don't assume that audit_log_exit() et.al. are called for the context of
current; pass task explictly.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2006-03-29 20:02:55 -05:00
parent e0a515bc6a
commit 45d9bb0e37
1 changed files with 10 additions and 10 deletions
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20
kernel/auditsc.c
View File

@ -536,13 +536,13 @@ error_path:
return;
}
static void audit_log_task_info(struct audit_buffer *ab, gfp_t gfp_mask)
static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk, gfp_t gfp_mask)
{
char name[sizeof(current->comm)];
struct mm_struct *mm = current->mm;
char name[sizeof(tsk->comm)];
struct mm_struct *mm = tsk->mm;
struct vm_area_struct *vma;
get_task_comm(name, current);
get_task_comm(name, tsk);
audit_log_format(ab, " comm=");
audit_log_untrustedstring(ab, name);
@ -551,7 +551,7 @@ static void audit_log_task_info(struct audit_buffer *ab, gfp_t gfp_mask)
/*
* this is brittle; all callers that pass GFP_ATOMIC will have
* NULL current->mm and we won't get here.
* NULL tsk->mm and we won't get here.
*/
down_read(&mm->mmap_sem);
vma = mm->mmap;
@ -569,7 +569,7 @@ static void audit_log_task_info(struct audit_buffer *ab, gfp_t gfp_mask)
audit_log_task_context(ab, gfp_mask);
}
static void audit_log_exit(struct audit_context *context, gfp_t gfp_mask)
static void audit_log_exit(struct audit_context *context, struct task_struct *tsk, gfp_t gfp_mask)
{
int i;
struct audit_buffer *ab;
@ -587,8 +587,8 @@ static void audit_log_exit(struct audit_context *context, gfp_t gfp_mask)
audit_log_format(ab, " success=%s exit=%ld",
(context->return_valid==AUDITSC_SUCCESS)?"yes":"no",
context->return_code);
if (current->signal->tty && current->signal->tty->name)
tty = current->signal->tty->name;
if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name)
tty = tsk->signal->tty->name;
else
tty = "(none)";
audit_log_format(ab,
@ -720,7 +720,7 @@ void audit_free(struct task_struct *tsk)
* We use GFP_ATOMIC here because we might be doing this
* in the context of the idle thread */
if (context->in_syscall && context->auditable)
audit_log_exit(context, GFP_ATOMIC);
audit_log_exit(context, tsk, GFP_ATOMIC);
audit_free_context(context);
}
@ -839,7 +839,7 @@ void audit_syscall_exit(struct task_struct *tsk, int valid, long return_code)
goto out;
if (context->in_syscall && context->auditable)
audit_log_exit(context, GFP_KERNEL);
audit_log_exit(context, tsk, GFP_KERNEL);
context->in_syscall = 0;
context->auditable = 0;