From 2667e069e7b5807c69f32109d930967bc1b222cb Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Alex=20Benn=C3=A9e?= Date: Fri, 24 Jul 2020 07:45:01 +0100 Subject: linux-user: don't use MAP_FIXED in pgd_find_hole_fallback MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Plain MAP_FIXED has the undesirable behaviour of splatting exiting maps so we don't actually achieve what we want when looking for gaps. We should be using MAP_FIXED_NOREPLACE. As this isn't always available we need to potentially check the returned address to see if the kernel gave us what we asked for. Fixes: ad592e37dfc ("linux-user: provide fallback pgd_find_hole for bare chroots") Signed-off-by: Alex Bennée Reviewed-by: Richard Henderson Message-Id: <20200724064509.331-9-alex.bennee@linaro.org> --- include/qemu/osdep.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include') diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h index 0b1298b3c9..20872e793e 100644 --- a/include/qemu/osdep.h +++ b/include/qemu/osdep.h @@ -173,6 +173,9 @@ extern int daemon(int, int); #ifndef MAP_ANONYMOUS #define MAP_ANONYMOUS MAP_ANON #endif +#ifndef MAP_FIXED_NOREPLACE +#define MAP_FIXED_NOREPLACE 0 +#endif #ifndef ENOMEDIUM #define ENOMEDIUM ENODEV #endif -- cgit v1.2.3