1 files changed, 52 insertions, 0 deletions
diff --git a/meta/recipes-devtools/qemu/qemu/0006-qemu-Add-some-user-space-mmap-tweaks-to-address-musl.patch b/meta/recipes-devtools/qemu/qemu/0006-qemu-Add-some-user-space-mmap-tweaks-to-address-musl.patch
new file mode 100644
index 0000000000..75c0369318
--- /dev/null
+++ b/meta/recipes-devtools/qemu/qemu/0006-qemu-Add-some-user-space-mmap-tweaks-to-address-musl.patch
@@ -0,0 +1,52 @@
+From 375cae3dd6151ef33cae8f243f6a2c2da6c0c356 Mon Sep 17 00:00:00 2001
+From: Richard Purdie <richard.purdie@linuxfoundation.org>
+Date: Fri, 8 Jan 2021 17:27:06 +0000
+Subject: [PATCH 06/12] qemu: Add some user space mmap tweaks to address musl
+ 32 bit
+
+When using qemu-i386 to build qemux86 webkitgtk on musl, it sits in an
+infinite loop of mremap calls of ever decreasing/increasing addresses.
+
+I suspect something in the musl memory allocation code loops indefinitely
+if it only sees ENOMEM and only exits when it hits EFAULT.
+
+According to the docs, trying to mremap outside the address space
+can/should return EFAULT and changing this allows the build to succeed.
+
+A better return value for the other cases of invalid addresses is EINVAL
+rather than ENOMEM so adjust the other part of the test to this.
+
+Upstream-Status: Submitted [https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg01355.html]
+Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org
+
+---
+ linux-user/mmap.c | 10 +++++++---
+ 1 file changed, 7 insertions(+), 3 deletions(-)
+
+diff --git a/linux-user/mmap.c b/linux-user/mmap.c
+index c125031b9..e651834a5 100644
+--- a/linux-user/mmap.c
++++ b/linux-user/mmap.c
+@@ -749,12 +749,16 @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
+     int prot;
+     void *host_addr;
+ 
+-    if (!guest_range_valid_untagged(old_addr, old_size) ||
+-        ((flags & MREMAP_FIXED) &&
++    if (!guest_range_valid_untagged(old_addr, old_size)) {
++        errno = EFAULT;
++        return -1;
++    }
++    
++    if (((flags & MREMAP_FIXED) &&
+          !guest_range_valid_untagged(new_addr, new_size)) ||
+         ((flags & MREMAP_MAYMOVE) == 0 &&
+          !guest_range_valid_untagged(old_addr, new_size))) {
+-        errno = ENOMEM;
++        errno = EINVAL;
+         return -1;
+     }
+ 
+-- 
+2.30.2
+