On 31/7/19 09:05, Bastian Krause wrote:
> On 7/30/19 5:48 PM, Ahmad Fatoum wrote:
>> Trying to output a single character via
>> echo -a /dev/serial0-1
>> currently results in garbage output after the newline, because console.c's
>> fops_write discards the buffer length and passes the buffer to
>> (struct cdev)::puts which only handles NUL-terminated strings.
>>
>> Fix this by amending (struct cdev)::puts with a new nbytes parameter,
>> which is correctly propagated.
>>
>> Fixes: 1233570798 ("console: expose consoles in devfs")
>
> The is the wrong commit id, I guess you mean b4f55fcf35.
Oh, off by one (commit). Will resend.
>
>> Cc: Bastian Krause <bst@xxxxxxxxxxxxxx>
>> Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
>> ---
>> common/console.c | 12 ++++++------
>> common/ratp/ratp.c | 12 +++++-------
>> drivers/serial/efi-stdio.c | 5 +++--
>> drivers/serial/serial_efi.c | 5 +++--
>> fs/pstore/platform.c | 7 ++++---
>> include/console.h | 2 +-
>> 6 files changed, 22 insertions(+), 21 deletions(-)
>>
>> diff --git a/common/console.c b/common/console.c
>> index 47ccf2e54de0..59218ea4e22f 100644
>> --- a/common/console.c
>> +++ b/common/console.c
>> @@ -253,17 +253,17 @@ static void console_set_stdoutpath(struct console_device *cdev)
>> free(str);
>> }
>>
>> -static int __console_puts(struct console_device *cdev, const char *s)
>> +static int __console_puts(struct console_device *cdev, const char *s,
>> + size_t nbytes)
>> {
>> - int n = 0;
>> + int n;
>>
>> - while (*s) {
>> + for (n = 0; n < nbytes; n++) {
>> if (*s == '\n') {
>> cdev->putc(cdev, '\r');
>> n++;
>> }
>> cdev->putc(cdev, *s);
>> - n++;
>> s++;
>> }
>> return n;
>> @@ -298,7 +298,7 @@ static ssize_t fops_write(struct cdev* dev, const void* buf, size_t count,
>> {
>> struct console_device *priv = dev->priv;
>>
>> - priv->puts(priv, buf);
>> + priv->puts(priv, buf, count);
>>
>> return 0;
>> }
>> @@ -545,7 +545,7 @@ int console_puts(unsigned int ch, const char *str)
>> if (initialized == CONSOLE_INIT_FULL) {
>> for_each_console(cdev) {
>> if (cdev->f_active & ch) {
>> - n = cdev->puts(cdev, str);
>> + n = cdev->puts(cdev, str, strlen(str));
>> }
>> }
>> return n;
>> diff --git a/common/ratp/ratp.c b/common/ratp/ratp.c
>> index 9aea1786d684..e84ad221672a 100644
>> --- a/common/ratp/ratp.c
>> +++ b/common/ratp/ratp.c
>> @@ -259,19 +259,17 @@ static int ratp_console_tstc(struct console_device *cdev)
>> return kfifo_len(ctx->console_recv_fifo) ? 1 : 0;
>> }
>>
>> -static int ratp_console_puts(struct console_device *cdev, const char *s)
>> +static int ratp_console_puts(struct console_device *cdev, const char *s,
>> + size_t nbytes)
>> {
>> struct ratp_ctx *ctx = container_of(cdev, struct ratp_ctx, ratp_console);
>> - int len = 0;
>> -
>> - len = strlen(s);
>>
>> if (ratp_busy(&ctx->ratp))
>> - return len;
>> + return nbytes;
>>
>> - kfifo_put(ctx->console_transmit_fifo, s, len);
>> + kfifo_put(ctx->console_transmit_fifo, s, nbytes);
>>
>> - return len;
>> + return nbytes;
>> }
>>
>> static void ratp_console_putc(struct console_device *cdev, char c)
>> diff --git a/drivers/serial/efi-stdio.c b/drivers/serial/efi-stdio.c
>> index 0703f727e766..2ca89fa4f861 100644
>> --- a/drivers/serial/efi-stdio.c
>> +++ b/drivers/serial/efi-stdio.c
>> @@ -243,12 +243,13 @@ static int efi_process_key(struct efi_console_priv *priv, const char *inp)
>> return 1;
>> }
>>
>> -static int efi_console_puts(struct console_device *cdev, const char *s)
>> +static int efi_console_puts(struct console_device *cdev, const char *s,
>> + size_t nbytes)
>> {
>> struct efi_console_priv *priv = to_efi(cdev);
>> int n = 0;
>>
>> - while (*s) {
>> + while (nbytes--) {
>> if (*s == 27) {
>> priv->efi_console_buffer[n] = 0;
>> priv->out->output_string(priv->out,
>> diff --git a/drivers/serial/serial_efi.c b/drivers/serial/serial_efi.c
>> index f0a2b22c2bc2..667d51f622ec 100644
>> --- a/drivers/serial/serial_efi.c
>> +++ b/drivers/serial/serial_efi.c
>> @@ -130,13 +130,14 @@ static void efi_serial_putc(struct console_device *cdev, char c)
>> serial->write(serial, &buffersize, &c);
>> }
>>
>> -static int efi_serial_puts(struct console_device *cdev, const char *s)
>> +static int efi_serial_puts(struct console_device *cdev, const char *s,
>> + size_t nbytes)
>> {
>> struct efi_serial_port *uart = to_efi_serial_port(cdev);
>> struct efi_serial_io_protocol *serial = uart->serial;
>> uint32_t control;
>> efi_status_t efiret;
>> - unsigned long buffersize = strlen(s) * sizeof(char);
>> + unsigned long buffersize = nbytes;
>>
>> do {
>> efiret = serial->getcontrol(serial, &control);
>> diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
>> index 755363c30999..601bfca6b025 100644
>> --- a/fs/pstore/platform.c
>> +++ b/fs/pstore/platform.c
>> @@ -67,10 +67,11 @@ static void pstore_console_write(const char *s, unsigned c)
>> }
>> }
>>
>> -static int pstore_console_puts(struct console_device *cdev, const char *s)
>> +static int pstore_console_puts(struct console_device *cdev, const char *s,
>> + size_t nbytes)
>> {
>> - pstore_console_write(s, strlen(s));
>> - return strlen(s);
>> + pstore_console_write(s, nbytes);
>> + return nbytes;
>> }
>>
>> static void pstore_console_putc(struct console_device *cdev, char c)
>> diff --git a/include/console.h b/include/console.h
>> index 673921331db7..1d86a584a7f2 100644
>> --- a/include/console.h
>> +++ b/include/console.h
>> @@ -42,7 +42,7 @@ struct console_device {
>>
>> int (*tstc)(struct console_device *cdev);
>> void (*putc)(struct console_device *cdev, char c);
>> - int (*puts)(struct console_device *cdev, const char *s);
>> + int (*puts)(struct console_device *cdev, const char *s, size_t nbytes);
>> int (*getc)(struct console_device *cdev);
>> int (*setbrg)(struct console_device *cdev, int baudrate);
>> void (*flush)(struct console_device *cdev);
>>
>
> Looks correct.
>
> Bastian
>
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