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init: use do_mount() instead of ksys_mount()

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In prepare_namespace(), do_mount() can be used instead of ksys_mount()
as the first and third argument are const strings in the kernel, the
second and fourth argument are passed through anyway, and the fifth
argument is NULL.

In do_mount_root(), ksys_mount() is called with the first and third
argument being already kernelspace strings, which do not need to be
copied over from userspace to kernelspace (again). The second and
fourth arguments are passed through to do_mount() anyway. The fifth
argument, while already residing in kernelspace, needs to be put into
a page of its own. Then, do_mount() can be used instead of
ksys_mount().

Once this is done, there are no in-kernel users to ksys_mount() left,
which can therefore be removed.

Change-Id: Ie21248b26e4a98796e092e20c9b8cb8126dc5eee
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Patch-mainline: linux-kernel@vger.kernel.org @ 12/12/2019, 14:57
[pragalla@codeaurora.org:fix merge conflicts and port changes to 5.4 kernel]
Signed-off-by: Pradeep P V K <pragalla@codeaurora.org>
This commit is contained in:
Dominik Brodowski 2019-12-12 14:57:24 +01:00 committed by Pradeep P V K
parent c1da4dfce4
commit 6dcfbd35bd
1 changed files with 19 additions and 4 deletions
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23
init/do_mounts.c
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@ -386,9 +386,21 @@ static void __init get_fs_names(char *page)
static int __init do_mount_root(char *name, char *fs, int flags, void *data)
{
struct super_block *s;
int err = ksys_mount(name, "/root", fs, flags, data);
if (err)
return err;
char *data_page;
struct page *p;
int ret;
/* do_mount() requires a full page as fifth argument */
p = alloc_page(GFP_KERNEL);
if (!p)
return -ENOMEM;
data_page = page_address(p);
strscpy(data_page, data, PAGE_SIZE - 1);
ret = ksys_mount(name, "/root", fs, flags, data_page);
if (ret)
goto out;
ksys_chdir("/root");
s = current->fs->pwd.dentry->d_sb;
@ -398,7 +410,10 @@ static int __init do_mount_root(char *name, char *fs, int flags, void *data)
s->s_type->name,
sb_rdonly(s) ? " readonly" : "",
MAJOR(ROOT_DEV), MINOR(ROOT_DEV));
return 0;
out:
put_page(p);
return ret;
}
void __init mount_block_root(char *name, int flags)