restructure results

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-permissions: 0.101
-PID: 0.099
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-
-segfault mremap 4096
-
-a qemu-hosted process segfaults when the program calls mremap to shrink the size of a buffer to 4096 that was allocated with mmap. See below for a C program to reproduce this issue.  I was able to compile this program for both i386 and 32-bit arm, and use qemu-i386 and qemu-arm to reproduce the segfault.  If I run the i386 program natively on my x86_64 system, no segfault occurs.  Also note that if I change the mremap size to something else such as 12288, no segfault occurs.  I also confirmed using qemu's -singlestep debug option that the segfault occurs during the mremap syscall.
-
-If you save the source below to mremapbug.c, the following should reproduce the issue given you have gcc-multilib:
-
-gcc -m32 mremapbug.c
-# works
-./a.out
-# segfault
-qemu-i386 a.out
-
-If you can also compile to arm, the same thing happens when running "qemu-arm a.out".  I also tried compiling natively and running "qemu-x86_64 a.out" but no segfault in that case, not sure if it's because it is 64-bits or if it was because it was my native target.
-
-
-#define _GNU_SOURCE
-#include <stdlib.h>
-#include <stdio.h>
-#include <sys/mman.h>
-
-int main(int argc, char *argv[])
-{
-  const size_t initial_size = 8192;
-
-  printf("calling mmap, size=%llu\n", (unsigned long long)initial_size);
-  void *mmap_ptr = mmap(NULL, initial_size,
-                   PROT_READ | PROT_WRITE ,
-                   MAP_PRIVATE | MAP_ANONYMOUS,
-                   -1, 0);
-  printf("mmap returned  : %p\n", mmap_ptr);
-  if (mmap_ptr == MAP_FAILED) {
-    perror("mmap");
-    exit(1);
-  }
-
-  const size_t new_size = 4096;
-  printf("calling mremap, size=%llu\n", (unsigned long long)new_size);
-  void *remap_ptr = mremap(mmap_ptr, initial_size, new_size, 0);
-  printf("mremap returned: %p\n", remap_ptr);
-  if (remap_ptr != mmap_ptr) {
-    perror("mreamap");
-    exit(1);
-  }
-  printf("Success: pointers match\n");
-}
-
-
-This issue was found while I was pushing code that calls "mremap" to the Zig compiler repository, it's CI testing uses qemu-i386 and qemu-arm to run tests for non-native hosts.  I've filed an issue in that repository as well with details on how to reproduce this issue with the Zig compiler as well: https://github.com/ziglang/zig/issues/5245
-
-Thanks to @LemonBoy for finding this:
-
-It looks like this issue my be caused by this chunk of code in linux-user/mmap.c
-
-        if (prot == 0) {
-            host_addr = mremap(g2h(old_addr), old_size, new_size, flags);
-            if (host_addr != MAP_FAILED && reserved_va && old_size > new_size) {
-                mmap_reserve(old_addr + old_size, new_size - old_size);
-            }
-        } else {
-            errno = ENOMEM;
-            host_addr = MAP_FAILED;
-        }
-
-if new_size is less than old_size (which is the case in my example program) then we'll get an integer underflow which would cause a very large value passed to mmap_reserve
-
-I've submitted a patch, this is my first qemu patch so sorry if I didn't format it correctly: https://lists.gnu.org/archive/html/qemu-trivial/2020-05/msg00000.html
-
-FYI, first patch in the previous comment was wrong.  This new patch is the correct one: https://lists.gnu.org/archive/html/qemu-devel/2020-05/msg00183.html
-
-
-Fix has been included here:
-https://git.qemu.org/?p=qemu.git;a=commitdiff;h=257a7e212d5e518ac5
-
-Patch has been included here:
-https://git.qemu.org/?p=qemu.git;a=commitdiff;h=257a7e212d5e518ac53b
-