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authorLinus Torvalds <torvalds@linux-foundation.org>2018-06-13 06:52:16 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-06-13 06:52:16 +0300
commitf5b7769eb0400ec5217a47e41148a9f816ca1f9f (patch)
tree2523ae64572026769c2d362a5b7e18fff35d49f7
parentdbee3d02458b129b847c21f5fa60baba3eafc6f7 (diff)
downloadlinux-f5b7769eb0400ec5217a47e41148a9f816ca1f9f.tar.xz
Revert "debugfs: inode: debugfs_create_dir uses mode permission from parent"
This reverts commit 95cde3c59966f6371b6bcd9e4e2da2ba64ee9775. The commit had good intentions, but it breaks kvm-tool and qemu-kvm. With it in place, "lkvm run" just fails with Error: KVM_CREATE_VM ioctl Warning: Failed init: kvm__init which isn't a wonderful error message, but bisection pinpointed the problematic commit. The problem is almost certainly due to the special kvm debugfs entries created dynamically by kvm under /sys/kernel/debug/kvm/. See kvm_create_vm_debugfs() Bisected-and-reported-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Wanpeng Li <kernellwp@gmail.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Thomas Richter <tmricht@linux.ibm.com> Cc: Kees Cook <keescook@chromium.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/debugfs/inode.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index a913b12fc7f8..13b01351dd1c 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -512,9 +512,7 @@ struct dentry *debugfs_create_dir(const char *name, struct dentry *parent)
if (unlikely(!inode))
return failed_creating(dentry);
- if (!parent)
- parent = debugfs_mount->mnt_root;
- inode->i_mode = S_IFDIR | ((d_inode(parent)->i_mode & 0770));
+ inode->i_mode = S_IFDIR | S_IRWXU | S_IRUGO | S_IXUGO;
inode->i_op = &simple_dir_inode_operations;
inode->i_fop = &simple_dir_operations;