From: Ilya Leoshkevich <i...@linux.ibm.com>
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-sta...@nongnu.org
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2598
Suggested-by: Richard Henderson <richard.hender...@linaro.org>
Signed-off-by: Ilya Leoshkevich <i...@linux.ibm.com>
Message-ID: <20241023002558.34589-1-...@linux.ibm.com>
Signed-off-by: Richard Henderson <richard.hender...@linaro.org>
(cherry picked from commit fb7f3572b111ffb6c2dd2c7f6c5b4dc57dd8a3f5)
Signed-off-by: Michael Tokarev <m...@tls.msk.ru>
diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index d11842cb94..a79f915c37 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -2980,7 +2980,7 @@ 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) {
--
2.39.5
