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>

diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 6cef8db3b53674fbe618fe55dc635d3186feb8e4..d6ad77d27dc209b36004467cf4699daae2d29220 100644 (file)
--- 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) {