search for: check_sticky

...ting around the sticky bit... (This is what you observe happenning when, as 'root', you fail to delete the file in your home directory.) The reason root is still able to delete the /tmp/ file and not the /home/wini/ file is because root owns the /tmp/ directory. Take a look at the function check_sticky() in linux/fs/namei.c. You'll see that there is a check to see if the owner of the directory is the user trying to do the deed. If so, the sys_unlink() succeeds. For the security paranoid: all system files/directories should be owned by some user with no login account: 'adm' or 'sy...

...btrfs_clear_opt(o, opt) ((o) &= ~BTRFS_MOUNT_##opt) #define btrfs_set_opt(o, opt) ((o) |= BTRFS_MOUNT_##opt) diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 906e3b3..919b23f 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -409,6 +409,76 @@ fail: return ret; } +/* copy of check_sticky in fs/namei.c() +* It''s inline, so penalty for filesystems that don''t use sticky bit is +* minimal. +*/ +static inline int btrfs_check_sticky(struct inode *dir, struct inode *inode) +{ + uid_t fsuid = current_fsuid(); + + if (!(dir->i_mode & S_ISVTX)) + return 0; + if (in...