diff mbox

[U-Boot,v4,5/5] Make printf and vprintf safe from buffer overruns

Message ID 1318980986-20843-6-git-send-email-sjg@chromium.org
State New, archived
Headers show

Commit Message

Simon Glass Oct. 18, 2011, 11:36 p.m. UTC 
From: Sonny Rao <sonnyrao@chromium.org>

From: Sonny Rao <sonnyrao@chromium.org>

utilize the added vscnprintf functions to avoid buffer overruns
The implementation is fairly dumb in that it doesn't detect
that the buffer is too small, but at least will not cause crashes.

Signed-off-by: Sonny Rao <sonnyrao@chromium.org>
---
Changes in v2:
- Use sizeof(printbuffer) instead of CONFIG_SYS_PBSIZE
- Drop patch which changes network code to use snprintf()

 common/console.c |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)
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Patch

diff --git a/common/console.c b/common/console.c
index f17875e..1177f7d 100644
--- a/common/console.c
+++ b/common/console.c
@@ -212,7 +212,7 @@  int serial_printf(const char *fmt, ...)
 	/* For this to work, printbuffer must be larger than
 	 * anything we ever want to print.
 	 */
-	i = vsprintf(printbuffer, fmt, args);
+	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 	va_end(args);
 
 	serial_puts(printbuffer);
@@ -281,7 +281,7 @@  int fprintf(int file, const char *fmt, ...)
 	/* For this to work, printbuffer must be larger than
 	 * anything we ever want to print.
 	 */
-	i = vsprintf(printbuffer, fmt, args);
+	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 	va_end(args);
 
 	/* Send to desired file */
@@ -426,7 +426,7 @@  int printf(const char *fmt, ...)
 	/* For this to work, printbuffer must be larger than
 	 * anything we ever want to print.
 	 */
-	i = vsprintf(printbuffer, fmt, args);
+	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 	va_end(args);
 
 	/* Print the string */
@@ -447,7 +447,7 @@  int vprintf(const char *fmt, va_list args)
 	/* For this to work, printbuffer must be larger than
 	 * anything we ever want to print.
 	 */
-	i = vsprintf(printbuffer, fmt, args);
+	i = vscnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 
 	/* Print the string */
 	puts(printbuffer);
@@ -514,7 +514,7 @@  inline void dbg(const char *fmt, ...)
 	/* For this to work, printbuffer must be larger than
 	 * anything we ever want to print.
 	 */
-	i = vsprintf(printbuffer, fmt, args);
+	i = vsnprintf(printbuffer, sizeof(printbuffer), fmt, args);
 	va_end(args);
 
 	if ((screen + sizeof(screen) - 1 - cursor)