Attachment 308982 Details for Bug 446777 – debug patch to get more info about the EPERM issue

[patch] debug patch to get more info about the EPERM issue

futex-debug.patch (text/plain), 1.12 KB, created by Thomas Gleixner on 2008-06-11 19:29:49 UTC

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Creator: Thomas Gleixner

Created: 2008-06-11 19:29:49 UTC

Size: 1.12 KB

patch

obsolete

>---
> kernel/futex.c |   12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
>Index: linux-2.6.24/kernel/futex.c
>===================================================================
>--- linux-2.6.24.orig/kernel/futex.c
>+++ linux-2.6.24/kernel/futex.c
>@@ -227,8 +227,12 @@ static int get_futex_key(u32 __user *uad
> 	/*
> 	 * Permissions.
> 	 */
>-	if (unlikely((vma->vm_flags & (VM_IO|VM_READ)) != VM_READ))
>+	if (unlikely((vma->vm_flags & (VM_IO|VM_READ)) != VM_READ)) {
>+		printk(KERN_INFO
>+		       "get_futex_key: vmf 0x%08lx, uad %p TID %d\n",
>+		       vma->vm_flags, uaddr, task_pid_vnr(current));
> 		return (vma->vm_flags & VM_IO) ? -EPERM : -EACCES;
>+	}
> 
> 	/*
> 	 * Private mappings are handled in a simple way.
>@@ -1638,8 +1642,12 @@ retry:
> 	/*
> 	 * We release only a lock we actually own:
> 	 */
>-	if ((uval & FUTEX_TID_MASK) != task_pid_vnr(current))
>+	if ((uval & FUTEX_TID_MASK) != task_pid_vnr(current)) {
>+		printk(KERN_INFO
>+		       "futex_unlock_pi: uval 0x%08x, uad %p TID %d\n",
>+		       (unsigned int) uval, uaddr, task_pid_vnr(current));
> 		return -EPERM;
>+	}
> 	/*
> 	 * First take all the futex related locks:
> 	 */

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Attachments on bug 446777: 308695 | 308696 | 308719 | 308757 | 308759 | 308893 | 308982 | 308997 | 309012 | 309042 | 309095 | 309124 | 310758 | 310767 | 313695