[CRIU] [PATCH 2/5] zdtm/vdso/ia32: Use uint64_t for /proc/self/maps

[Dmitry Safonov]

Add some comments to state things those might be not obvious.

Signed-off-by: Dmitry Safonov <dima at arista.com>
---
 test/zdtm/static/vdso-proxy.c | 25 ++++++++++++++++++-------
 1 file changed, 18 insertions(+), 7 deletions(-)

diff --git a/test/zdtm/static/vdso-proxy.c b/test/zdtm/static/vdso-proxy.c
index 2381127b7b7d..66d6741f4b2d 100644
--- a/test/zdtm/static/vdso-proxy.c
+++ b/test/zdtm/static/vdso-proxy.c
@@ -1,3 +1,4 @@
+#include <inttypes.h>
 #include <stdbool.h>
 #include <stdlib.h>
 
@@ -8,6 +9,10 @@ const char *test_author	= "Dmitry Safonov <dsafonov at virtuozzo.com>";
 
 #define BUILD_BUG_ON(condition)	((void)sizeof(char[1 - 2*!!(condition)]))
 #define VDSO_BAD_ADDR		(-1ul)
+/*
+ * Use constant MAX_VMAS - to minimize the risk of allocating a new
+ * mapping or changing the size of existent VMA with realloc()
+ */
 #define MAX_VMAS		80
 #define BUF_SIZE		1024
 
@@ -18,8 +23,13 @@ const char *test_author	= "Dmitry Safonov <dsafonov at virtuozzo.com>";
  * Also previous vdso/vvar vma should still be present after C/R.
  */
 struct vm_area {
-	unsigned long start;
-	unsigned long end;
+	/*
+	 * Intentionally use 64bit integer to make sure that it's possible
+	 * to parse mappings >4Gb - those might appear on ia32
+	 * that's restored by x86_64 CRIU ¯\(°_o)/¯
+	 */
+	uint64_t start;
+	uint64_t end;
 	bool is_vvar_or_vdso;
 };
 
@@ -43,11 +53,12 @@ static int parse_maps(struct vm_area *vmas)
 		if (fgets(buf, BUF_SIZE, maps) == NULL)
 			break;
 
-		v->start = strtoul(buf, &end, 16);
-		v->end = strtoul(end + 1, NULL, 16);
+		v->start = strtoull(buf, &end, 16);
+		v->end = strtoull(end + 1, NULL, 16);
 		v->is_vvar_or_vdso |= strstr(buf, "[vdso]") != NULL;
 		v->is_vvar_or_vdso |= strstr(buf, "[vvar]") != NULL;
-		test_msg("[NOTE]\tVMA: [%#lx, %#lx]\n", v->start, v->end);
+		test_msg("[NOTE]\tVMA: [%#" PRIx64 ", %#" PRIx64 "]\n",
+				v->start, v->end);
 	}
 
 	if (i == MAX_VMAS) {
@@ -88,7 +99,7 @@ static int check_vvar_vdso(struct vm_area *before, struct vm_area *after)
 			continue;
 
 		if (cmp < 0) {/* Lost mapping */
-			test_msg("[NOTE]\tLost mapping: %#lx-%#lx\n",
+			test_msg("[NOTE]\tLost mapping: %#" PRIx64 "-%#" PRIx64 "\n",
 				before[i].start, before[i].end);
 			j--;
 			if (before[i].is_vvar_or_vdso) {
@@ -98,7 +109,7 @@ static int check_vvar_vdso(struct vm_area *before, struct vm_area *after)
 			continue;
 		}
 
-		test_msg("[NOTE]\tNew mapping appeared: %#lx-%#lx\n",
+		test_msg("[NOTE]\tNew mapping appeared: %#" PRIx64 "-%#" PRIx64 "\n",
 			after[j].start, after[j].end);
 		i--;
 	}
-- 
2.21.0