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+id = 1729
+title = "mremap fails with EFAULT if address range overlaps with stack guard"
+state = "closed"
+created_at = "2023-06-25T06:50:48.249Z"
+closed_at = "2024-10-20T22:02:11.370Z"
+labels = ["linux-user"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/1729"
+host-os = "any linux"
+host-arch = "x86_64"
+qemu-version = "any version"
+guest-os = "alpine-linux"
+guest-arch = "ARM 32-bit"
+description = """When running 32-bit user-static on 64-bit host, `mremap` behave differently from the kernel. This difference let programs that call `pthread_getattr_np` on musl-libc to run into a loop on repeated calling `mremap`.
+
+https://git.musl-libc.org/cgit/musl/plain/src/thread/pthread_getattr_np.c
+
+``` c
+\t\twhile (mremap(p-l-PAGE_SIZE, PAGE_SIZE, 2*PAGE_SIZE, 0)==MAP_FAILED && errno==ENOMEM)
+\t\t\tl += PAGE_SIZE;
+```"""
+reproduce = """Compile the following program against musl-libc arm 32-bit, and run it in qemu-user-static on x86_64 host.
+
+``` c
+#define _GNU_SOURCE
+#include <pthread.h>
+
+int main(int argc, char *argv[]) {
+\tpthread_attr_t attr;
+\treturn pthread_getattr_np(pthread_self(), &attr);
+}
+```
+
+For example, on x86_64 fedora 38 with podman and qemu-user-static installed, we can reproduce this with alpine container:
+
+```
+$ podman run --rm -it --arch arm/v7 docker.io/library/alpine:latest
+
+/ # apk add alpine-sdk
+
+......
+
+/ # cat test.c
+#define _GNU_SOURCE
+#include <pthread.h>
+
+int main(int argc, char *argv[]) {
+\tpthread_attr_t attr;
+\treturn pthread_getattr_np(pthread_self(), &attr);
+}
+
+/ # gcc test.c
+
+/ # ./a.out
+```"""
+additional = """Original thread on musl mail list where this was initially reported: https://www.openwall.com/lists/musl/2017/06/15/9"""