plain text document attachment (ckrm_utils_copy_args.patch)
Patch: ckrm_utils_copy_args.patch
Description:
Add a function that will copy the arguments of a task into a newly-allocated
chunk of kernel memory.
Signed-Off-By: Matt Helsley <[EMAIL PROTECTED]>
%patch
Index: linux-2.6.12-rc3/kernel/ckrm/ckrmutils.c
===================================================================
--- linux-2.6.12-rc3.orig/kernel/ckrm/ckrmutils.c 2005-05-10
17:19:11.000000000 -0700
+++ linux-2.6.12-rc3/kernel/ckrm/ckrmutils.c 2005-05-10 17:19:21.000000000
-0700
@@ -15,12 +15,69 @@
*/
#include <linux/err.h>
#include <linux/mount.h>
#include <linux/module.h>
+#include <asm/uaccess.h> /* for strnlen_user and strncpy_from_user */
+#include <linux/vmalloc.h>
#include <linux/ckrm_rc.h>
+/*
+ * Copy the first n arguments from the task into kernel memory and return
+ * it as an argv[] array -- an array of character pointers whose last pointer
+ * is NULL.
+ *
+ * Caller takes responsibility for freeing the memory with vfree()
+ * tsk must be current
+ *
+ * returns NULL on error
+ */
+char** copy_task_args (struct task_struct *tsk, int n)
+{
+ char *uarg = NULL, *karg = NULL;
+ char **argv = NULL;
+ size_t len = 0;
+ struct mm_struct *mm = NULL;
+ int i;
+
+ mm = get_task_mm(tsk);
+ if (mm == NULL)
+ return NULL;
+
+ /* Get the size of the arguments */
+ i = n;
+ uarg = (char*)mm->arg_start;
+ for(; i && (len < (mm->arg_end - mm->arg_start)); i--){
+ size_t slen = strnlen_user(uarg, PAGE_SIZE - 1) + 1;
+ len += slen;
+ uarg += slen;
+ }
+
+ /* Allocate some space for the copy */
+ argv = vmalloc(len + (n + 1) * sizeof(char*));
+ if (argv == NULL)
+ goto return_result;
+ karg = (char*)argv;
+ karg += sizeof(char*) * (n + 1);
+
+ /* Make the copy */
+ uarg = (char*)mm->arg_start;
+ for (i = 0; i < n; i++){
+ size_t slen = strnlen_user(uarg, PAGE_SIZE - 1);
+ argv[i] = karg;
+ strncpy_from_user(karg, uarg, slen);
+ karg[slen] = '\0';
+ uarg += slen;
+ karg += slen;
+ }
+ argv[n] = NULL;
+return_result:
+ mmput(mm);
+ return argv;
+}
+
+
/*
* TODO: Use sparce to enforce cnt_lock.
*
* must be called with cnt_lock of parres held
* Caller is responsible for making sure that the new guarantee doesn't
@@ -148,8 +205,9 @@ set_shares(struct ckrm_shares *new, stru
rc = 0;
set_share_err:
return rc;
}
+EXPORT_SYMBOL(copy_task_args);
EXPORT_SYMBOL_GPL(child_guarantee_changed);
EXPORT_SYMBOL_GPL(child_maxlimit_changed);
EXPORT_SYMBOL_GPL(set_shares);
--
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