1 files changed, 107 insertions, 0 deletions
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+peripherals: 0.769
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+user-level: 0.764
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+KVM: 0.397
+i386: 0.377
+mistranslation: 0.373
+virtual: 0.308
+--------------------
+user-level: 0.828
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+
+mremap fails with EFAULT if address range overlaps with stack guard
+Description of problem:
+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
+		while (mremap(p-l-PAGE_SIZE, PAGE_SIZE, 2*PAGE_SIZE, 0)==MAP_FAILED && errno==ENOMEM)
+			l += PAGE_SIZE;
+```
+Steps to 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[]) {
+	pthread_attr_t attr;
+	return 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[]) {
+	pthread_attr_t attr;
+	return pthread_getattr_np(pthread_self(), &attr);
+}
+
+/ # gcc test.c
+
+/ # ./a.out
+```
+Additional information:
+Original thread on musl mail list where this was initially reported: https://www.openwall.com/lists/musl/2017/06/15/9