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| author | Christoph Hellwig <hch@lst.de> | 2020-06-07 17:44:28 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2020-07-31 08:16:00 +0200 |
| commit | 8f740636d9049a3f9665a0ec87a00822ec1120b4 (patch) | |
| tree | b882c3795401b79acc3adf7bb7a329bb5dbe3b34 /init | |
| parent | bf6419e4d5440c6d414a320506c5488857a5b001 (diff) | |
| download | linux-8f740636d9049a3f9665a0ec87a00822ec1120b4.tar.gz | |
init: open code setting up stdin/stdout/stderr
Don't rely on the implicit set_fs(KERNEL_DS) for ksys_open to work, but instead open a struct file for /dev/console and then install it as FD 0/1/2 manually. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'init')
| -rw-r--r-- | init/main.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/init/main.c b/init/main.c index 0ead83e86b5a..db0621dfbb04 100644 --- a/init/main.c +++ b/init/main.c @@ -1457,15 +1457,19 @@ static int __ref kernel_init(void *unused) "See Linux Documentation/admin-guide/init.rst for guidance."); } +/* Open /dev/console, for stdin/stdout/stderr, this should never fail */ void console_on_rootfs(void) { - /* Open the /dev/console as stdin, this should never fail */ - if (ksys_open((const char __user *) "/dev/console", O_RDWR, 0) < 0) - pr_err("Warning: unable to open an initial console.\n"); + struct file *file = filp_open("/dev/console", O_RDWR, 0); - /* create stdout/stderr */ - (void) ksys_dup(0); - (void) ksys_dup(0); + if (IS_ERR(file)) { + pr_err("Warning: unable to open an initial console.\n"); + return; + } + get_file_rcu_many(file, 2); + fd_install(get_unused_fd_flags(0), file); + fd_install(get_unused_fd_flags(0), file); + fd_install(get_unused_fd_flags(0), file); } static noinline void __init kernel_init_freeable(void) |