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pstore: Make default pstorefs root dir perms 0750 

Currently only DMESG and CONSOLE record types are protected, and it isn't
obvious that they are using a capability check. Instead switch to explicit
root directory mode of 0750 to keep files private by default. This will
allow the removal of the capability check, which was non-obvious and
forces a process to have possibly too much privilege when simple post-boot
chgrp for readers would be possible without it.

Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
zero-colors
Kees Cook 2017-08-09 20:43:17 -07:00
parent 520eccdfe1
commit d7caa33687
1 changed files with 1 additions and 1 deletions
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2
fs/pstore/inode.c
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@ -471,7 +471,7 @@ static int pstore_fill_super(struct super_block *sb, void *data, int silent)
inode = pstore_get_inode(sb);
if (inode) {
inode->i_mode = S_IFDIR | 0755;
inode->i_mode = S_IFDIR | 0750;
inode->i_op = &pstore_dir_inode_operations;
inode->i_fop = &simple_dir_operations;
inc_nlink(inode);