[PATCH 2/2] linux-user: Fix loading static ARM cortex-m55 binaries

[Helge Deller <deller@kernel.org>]

From: Helge Deller <deller@gmx.de>

Static built ARM binaries for Cortex-m55 may have been linked to have
their load address at address 0 (because they are effectively a
bare-metal image). When qemu-user is running as non-root user and will
try to mmap() a host address at 0 (which is smaller than mmap_min_addr
according to /proc/sys/vm/mmap_min_addr), it will fail with EPERM and as
such loading those guest program will fail.

Fix pgb_addr_set() to always return false if the guest_loaddr <
mmap_min_addr, that way a valdid guest_base address will be calculated
and the EPERM can be avoided.

Signed-off-by: Helge Deller <deller@gmx.de>
Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Resolves: https://gitlab.com/qemu-project/qemu/-/work_items/1890
---
 linux-user/elfload.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 0e757787d2..77e0526996 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -866,7 +866,7 @@ static bool pgb_addr_set(PGBAddrs *ga, abi_ulong guest_loaddr,
         if (LO_COMMPAGE != -1 && LO_COMMPAGE < mmap_min_addr) {
             return false;
         }
-        if (guest_loaddr != 0 && guest_loaddr < mmap_min_addr) {
+        if (guest_loaddr < mmap_min_addr) {
             return false;
         }
     }
-- 
2.54.0