diff options
| author | Ilya Leoshkevich <iii@linux.ibm.com> | 2024-10-23 02:24:31 +0200 |
|---|---|---|
| committer | Richard Henderson <richard.henderson@linaro.org> | 2024-11-16 08:42:24 -0800 |
| commit | fb7f3572b111ffb6c2dd2c7f6c5b4dc57dd8a3f5 (patch) | |
| tree | fb738167a0beebf6d45a663454a9d2d5258d0d93 | |
| parent | 2a339fee450638b512c5122281cb5ab49331cfb8 (diff) | |
linux-user: Tolerate CONFIG_LSM_MMAP_MIN_ADDR
Running qemu-i386 on a system running with SELinux in enforcing mode
(more precisely: s390x trixie container on Fedora 40) fails with:
qemu-i386: tests/tcg/i386-linux-user/sigreturn-sigmask: Unable to find a guest_base to satisfy all guest address mapping requirements
00000000-ffffffff
The reason is that main() determines mmap_min_addr from
/proc/sys/vm/mmap_min_addr, but SELinux additionally defines
CONFIG_LSM_MMAP_MIN_ADDR, which is normally larger: 32K or 64K, but,
in general, can be anything. There is no portable way to query its
value: /boot/config, /proc/config and /proc/config.gz are distro- and
environment-specific.
Once the identity map fails, the magnitude of guest_base does not
matter, so fix by starting the search from 1M or 1G.
Cc: qemu-stable@nongnu.org
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2598
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-ID: <20241023002558.34589-1-iii@linux.ibm.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
| -rw-r--r-- | linux-user/elfload.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/linux-user/elfload.c b/linux-user/elfload.c index 6cef8db3b5..d6ad77d27d 100644 --- a/linux-user/elfload.c +++ b/linux-user/elfload.c @@ -2898,7 +2898,7 @@ static uintptr_t pgb_try_itree(const PGBAddrs *ga, uintptr_t base, static uintptr_t pgb_find_itree(const PGBAddrs *ga, IntervalTreeRoot *root, uintptr_t align, uintptr_t brk) { - uintptr_t last = mmap_min_addr; + uintptr_t last = sizeof(uintptr_t) == 4 ? MiB : GiB; uintptr_t base, skip; while (true) { |