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| author | Richard Henderson <richard.henderson@linaro.org> | 2020-07-24 14:23:14 -0700 |
|---|---|---|
| committer | Laurent Vivier <laurent@vivier.eu> | 2020-07-27 22:02:40 +0200 |
| commit | c9f8066697e0d3e77b97f6df423e9d6540b693be (patch) | |
| tree | b29b36e7cc438e1403ccf09ba99be4b9db678169 /python/qemu/machine.py | |
| parent | 9303ecb658a0194560d1eecde165a1511223c2d8 (diff) | |
| download | focaccia-qemu-c9f8066697e0d3e77b97f6df423e9d6540b693be.tar.gz focaccia-qemu-c9f8066697e0d3e77b97f6df423e9d6540b693be.zip | |
linux-user: Ensure mmap_min_addr is non-zero
When the chroot does not have /proc mounted, we can read neither /proc/sys/vm/mmap_min_addr nor /proc/sys/maps. The enforcement of mmap_min_addr in the host kernel is done by the security module, and so does not apply to processes owned by root. Which leads pgd_find_hole_fallback to succeed in probing a reservation at address 0. Which confuses pgb_reserved_va to believe that guest_base has not actually been initialized. We don't actually want NULL addresses to become accessible, so make sure that mmap_min_addr is initialized with a non-zero value. Buglink: https://bugs.launchpad.net/qemu/+bug/1888728 Reported-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Tested-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de> Acked-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <20200724212314.545877-1-richard.henderson@linaro.org> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Diffstat (limited to 'python/qemu/machine.py')
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