From 9c255cb53e44d5db57b3388fd6dfab96d4883790 Mon Sep 17 00:00:00 2001
From: Richard Henderson <richard.henderson@linaro.org>
Date: Fri, 7 Jul 2023 21:40:38 +0100
Subject: [PATCH] bsd-user: Use page_check_range_empty for MAP_EXCL
The previous check returned -1 when any page within
[start, start+len) is unmapped, not when all are unmapped.
Cc: Warner Losh <imp@bsdimp.com>
Cc: Kyle Evans <kevans@freebsd.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Warner Losh <imp@bsdimp.com>
Message-Id: <20230707204054.8792-11-richard.henderson@linaro.org>
---
bsd-user/mmap.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/bsd-user/mmap.c b/bsd-user/mmap.c
index 565b9f97ed..07b5b8055e 100644
--- a/bsd-user/mmap.c
+++ b/bsd-user/mmap.c
@@ -609,7 +609,7 @@ abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
}
/* Reject the mapping if any page within the range is mapped */
- if ((flags & MAP_EXCL) && page_check_range(start, len, 0) < 0) {
+ if ((flags & MAP_EXCL) && !page_check_range_empty(start, end - 1)) {
errno = EINVAL;
goto fail;
}