Messages in this thread | | | Date | Wed, 7 Oct 2020 23:39:21 +0900 | From | Sergey Senozhatsky <> | Subject | Re: [PATCH] printk: handle blank console arguments passed in. |
| |
On (20/10/07 21:30), Sergey Senozhatsky wrote: > On (20/10/07 09:28), Petr Mladek wrote: > > > > /* > > * Dirty hack to prevent using any console with tty > > * binding as a fallback and adding the empty > > * name into console_cmdline array. > > */ > > preferred_console = MAX_CMDLINECONSOLES; [..] > Hint: I can crash my laptop when I remove the "console=" boot param and > comment out init_dup(file) calls in console_on_rootfs().
My guess is that since we don't have stdin/out/err fds then, theoretically, something like this can happen
int main() { ... int fd = open(.... ); int fd = open(..., "vfat.ko");
//fd is 1
fprintf(stdout, "loading vfat\n"); ... }
stdout (fd 1) is not stdout, it's fd that we got from open(vfat.ko).
Does this make sense?
-ss
| |