linux-kernel - [PATCH v2] kconfig: switch to "long long" for sanity

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Date:	Thu, 18 Jul 2013 11:32:01 -0700
From:	Kees Cook <keescook@...omium.org>
To:	linux-kernel@...r.kernel.org
Cc:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	"Yann E. MORIN" <yann.morin.1998@...e.fr>,
	Michal Marek <mmarek@...e.cz>,
	Arve Hjønnevåg <arve@...roid.com>,
	linux-kbuild@...r.kernel.org
Subject: [PATCH v2] kconfig: switch to "long long" for sanity

Instead of using "long" for kconfig "hex" and "range" values, which may
change in size depending on the host architecture, use "long long". This
will allow values greater than INT_MAX on 32-bit hosts when cross
compiling.

Signed-off-by: Kees Cook <keescook@...omium.org>
---
v2:
 - use "int" for base, since that's what strtoll expects, thanks to Geert
---
 scripts/kconfig/symbol.c |   19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c
index d550300..5d850e7 100644
--- a/scripts/kconfig/symbol.c
+++ b/scripts/kconfig/symbol.c
@@ -136,7 +136,7 @@ static struct property *sym_get_range_prop(struct symbol *sym)
 	return NULL;
 }
 
-static long sym_get_range_val(struct symbol *sym, int base)
+static long long sym_get_range_val(struct symbol *sym, int base)
 {
 	sym_calc_value(sym);
 	switch (sym->type) {
@@ -149,13 +149,14 @@ static long sym_get_range_val(struct symbol *sym, int base)
 	default:
 		break;
 	}
-	return strtol(sym->curr.val, NULL, base);
+	return strtoll(sym->curr.val, NULL, base);
 }
 
 static void sym_validate_range(struct symbol *sym)
 {
 	struct property *prop;
-	long base, val, val2;
+	int base;
+	long long val, val2;
 	char str[64];
 
 	switch (sym->type) {
@@ -171,7 +172,7 @@ static void sym_validate_range(struct symbol *sym)
 	prop = sym_get_range_prop(sym);
 	if (!prop)
 		return;
-	val = strtol(sym->curr.val, NULL, base);
+	val = strtoll(sym->curr.val, NULL, base);
 	val2 = sym_get_range_val(prop->expr->left.sym, base);
 	if (val >= val2) {
 		val2 = sym_get_range_val(prop->expr->right.sym, base);
@@ -179,9 +180,9 @@ static void sym_validate_range(struct symbol *sym)
 			return;
 	}
 	if (sym->type == S_INT)
-		sprintf(str, "%ld", val2);
+		sprintf(str, "%lld", val2);
 	else
-		sprintf(str, "0x%lx", val2);
+		sprintf(str, "0x%llx", val2);
 	sym->curr.val = strdup(str);
 }
 
@@ -594,7 +595,7 @@ bool sym_string_valid(struct symbol *sym, const char *str)
 bool sym_string_within_range(struct symbol *sym, const char *str)
 {
 	struct property *prop;
-	long val;
+	long long val;
 
 	switch (sym->type) {
 	case S_STRING:
@@ -605,7 +606,7 @@ bool sym_string_within_range(struct symbol *sym, const char *str)
 		prop = sym_get_range_prop(sym);
 		if (!prop)
 			return true;
-		val = strtol(str, NULL, 10);
+		val = strtoll(str, NULL, 10);
 		return val >= sym_get_range_val(prop->expr->left.sym, 10) &&
 		       val <= sym_get_range_val(prop->expr->right.sym, 10);
 	case S_HEX:
@@ -614,7 +615,7 @@ bool sym_string_within_range(struct symbol *sym, const char *str)
 		prop = sym_get_range_prop(sym);
 		if (!prop)
 			return true;
-		val = strtol(str, NULL, 16);
+		val = strtoll(str, NULL, 16);
 		return val >= sym_get_range_val(prop->expr->left.sym, 16) &&
 		       val <= sym_get_range_val(prop->expr->right.sym, 16);
 	case S_BOOLEAN:
-- 
1.7.9.5


-- 
Kees Cook
Chrome OS Security
--
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