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linux-user: don't use MAP_FIXED in pgd_find_hole_fallback

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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: ad592e37df ("linux-user: provide fallback pgd_find_hole for bare chroots")
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20200724064509.331-9-alex.bennee@linaro.org>
This commit is contained in:
Alex Bennée
2020-07-24 07:45:01 +01:00
parent 163b3d1af2
commit 2667e069e7
2 changed files with 9 additions and 4 deletions
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3
include/qemu/osdep.h
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@ -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