From: menglong8.dong@gmail.com
To: christian.brauner@ubuntu.com
Cc: viro@zeniv.linux.org.uk, keescook@chromium.org,
samitolvanen@google.com, johan@kernel.org, ojeda@kernel.org,
jeyu@kernel.org, masahiroy@kernel.org, joe@perches.com,
dong.menglong@zte.com.cn, jack@suse.cz, hare@suse.de,
axboe@kernel.dk, tj@kernel.org, gregkh@linuxfoundation.org,
song@kernel.org, neilb@suse.de, akpm@linux-foundation.org,
linux@rasmusvillemoes.dk, brho@google.com, f.fainelli@gmail.com,
palmerdabbelt@google.com, wangkefeng.wang@huawei.com,
mhiramat@kernel.org, rostedt@goodmis.org, vbabka@suse.cz,
glider@google.com, pmladek@suse.com, johannes.berg@intel.com,
ebiederm@xmission.com, jojing64@gmail.com, terrelln@fb.com,
geert@linux-m68k.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org, mcgrof@kernel.org, arnd@arndb.de,
chris@chrisdown.name, mingo@kernel.org, bhelgaas@google.com,
josh@joshtriplett.org
Subject: [PATCH v6 1/2] init/main.c: introduce function ramdisk_exec_exist()
Date: Sat, 5 Jun 2021 11:44:46 +0800 [thread overview]
Message-ID: <20210605034447.92917-2-dong.menglong@zte.com.cn> (raw)
In-Reply-To: <20210605034447.92917-1-dong.menglong@zte.com.cn>
From: Menglong Dong <dong.menglong@zte.com.cn>
Introduce the function ramdisk_exec_exist, which is used to check the
exist of 'ramdisk_execute_command'.
To make path lookup follow the mount on '/', use vfs_path_lookup() in
init_eaccess(), and make the filesystem that mounted on '/' as root
during path lookup.
Signed-off-by: Menglong Dong <dong.menglong@zte.com.cn>
---
fs/init.c | 11 +++++++++--
include/linux/init.h | 1 +
init/main.c | 7 ++++++-
3 files changed, 16 insertions(+), 3 deletions(-)
diff --git a/fs/init.c b/fs/init.c
index 5c36adaa9b44..166356a1f15f 100644
--- a/fs/init.c
+++ b/fs/init.c
@@ -112,14 +112,21 @@ int __init init_chmod(const char *filename, umode_t mode)
int __init init_eaccess(const char *filename)
{
- struct path path;
+ struct path path, root;
int error;
- error = kern_path(filename, LOOKUP_FOLLOW, &path);
+ error = kern_path("/", LOOKUP_DOWN, &root);
if (error)
return error;
+ error = vfs_path_lookup(root.dentry, root.mnt, filename,
+ LOOKUP_FOLLOW, &path);
+ if (error)
+ goto on_err;
error = path_permission(&path, MAY_ACCESS);
+
path_put(&path);
+on_err:
+ path_put(&root);
return error;
}
diff --git a/include/linux/init.h b/include/linux/init.h
index d82b4b2e1d25..889d538b6dfa 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -149,6 +149,7 @@ extern unsigned int reset_devices;
void setup_arch(char **);
void prepare_namespace(void);
void __init init_rootfs(void);
+bool ramdisk_exec_exist(void);
extern struct file_system_type rootfs_fs_type;
#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX)
diff --git a/init/main.c b/init/main.c
index eb01e121d2f1..1153571ca977 100644
--- a/init/main.c
+++ b/init/main.c
@@ -1522,6 +1522,11 @@ void __init console_on_rootfs(void)
fput(file);
}
+bool __init ramdisk_exec_exist(void)
+{
+ return init_eaccess(ramdisk_execute_command) == 0;
+}
+
static noinline void __init kernel_init_freeable(void)
{
/*
@@ -1568,7 +1573,7 @@ static noinline void __init kernel_init_freeable(void)
* check if there is an early userspace init. If yes, let it do all
* the work
*/
- if (init_eaccess(ramdisk_execute_command) != 0) {
+ if (!ramdisk_exec_exist()) {
ramdisk_execute_command = NULL;
prepare_namespace();
}
--
2.32.0.rc0
next prev parent reply other threads:[~2021-06-05 3:46 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-05 3:44 [PATCH v6 0/2] init/initramfs.c: make initramfs support pivot_root menglong8.dong
2021-06-05 3:44 ` menglong8.dong [this message]
2021-06-05 3:44 ` [PATCH v6 2/2] init/do_mounts.c: create second mount for initramfs menglong8.dong
2021-06-05 11:50 ` Christian Brauner
2021-06-05 14:47 ` Menglong Dong
2021-06-07 10:31 ` Christian Brauner
2021-06-07 12:15 ` menglong8.dong
2021-06-17 3:57 ` Menglong Dong
2021-06-17 14:38 ` Christian Brauner
2021-07-27 12:24 ` Menglong Dong
2021-07-27 12:37 ` Christian Brauner
2021-07-28 8:07 ` Petr Mladek
2021-07-29 13:25 ` Menglong Dong
2021-09-17 1:58 ` Menglong Dong
2021-06-09 14:03 ` [PATCH v6 0/2] init/initramfs.c: make initramfs support pivot_root Masami Hiramatsu
2021-06-10 6:36 ` Menglong Dong
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