From: Namhyung Kim Date: Wed, 19 Oct 2016 01:23:41 +0000 (+0900) Subject: pstore: Convert console write to use ->write_buf X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=70ad35db3321a6d129245979de4ac9d06eed897c;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git pstore: Convert console write to use ->write_buf Maybe I'm missing something, but I don't know why it needs to copy the input buffer to psinfo->buf and then write. Instead we can write the input buffer directly. The only implementation that supports console message (i.e. ramoops) already does it for ftrace messages. For the upcoming virtio backend driver, it needs to protect psinfo->buf overwritten from console messages. If it could use ->write_buf method instead of ->write, the problem will be solved easily. Cc: Stefan Hajnoczi Signed-off-by: Namhyung Kim Signed-off-by: Kees Cook --- diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c index 60e6db6f5da2..729677e18e36 100644 --- a/fs/pstore/platform.c +++ b/fs/pstore/platform.c @@ -585,8 +585,8 @@ static void pstore_console_write(struct console *con, const char *s, unsigned c) } else { spin_lock_irqsave(&psinfo->buf_lock, flags); } - memcpy(psinfo->buf, s, c); - psinfo->write(PSTORE_TYPE_CONSOLE, 0, &id, 0, 0, 0, c, psinfo); + psinfo->write_buf(PSTORE_TYPE_CONSOLE, 0, &id, 0, + s, 0, c, psinfo); spin_unlock_irqrestore(&psinfo->buf_lock, flags); s += c; c = e - s;