Merge tag 'pull-lu-20231018' of https://gitlab.com/rth7680/qemu into staging

linux-user/mips: fix abort on integer overflow
linux-user/sh4: Fix crashes on signal delivery
linux-user/loongarch: Enable LSX/LASX in HWCAP
linux-user: Fixes for zero_bss
linux-user: Propagate failure in mmap_reserve_or_unmap back to target_munmap
linux-user: Detect and report host crashes
linux-user: Remap guest SIGABRT

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* tag 'pull-lu-20231018' of https://gitlab.com/rth7680/qemu:
  linux-user: Remap guest SIGABRT
  linux-user: Detect and report host SIGILL, SIGFPE, SIGTRAP
  linux-user: Split out host_sig{segv,bus}_handler
  linux-user: Simplify signal_init
  linux-user: Map unsupported signals to an out-of-bounds value
  linux-user: Only register handlers for core_dump_signal by default
  linux-user: Detect and report host crashes
  linux-user: Exit not abort in die_with_backtrace
  linux-user: Split out die_with_signal
  linux-user: Propagate failure in mmap_reserve_or_unmap back to target_munmap
  linux-user/elfload: Enable LSX/LASX in HWCAP for LoongArch
  linux-user/sh4: Fix crashes on signal delivery
  linux-user/mips: fix abort on integer overflow
  linux-user: Fixes for zero_bss

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

1 files changed, 17 insertions, 13 deletions

diff --git a/linux-user/mmap.c b/linux-user/mmap.c
index 8ccaab7859..7b44b9ff49 100644
--- a/linux-user/mmap.c
+++ b/linux-user/mmap.c
@@ -778,7 +778,7 @@ fail:
     return -1;
 }
 
-static void mmap_reserve_or_unmap(abi_ulong start, abi_ulong len)
+static int mmap_reserve_or_unmap(abi_ulong start, abi_ulong len)
 {
     abi_ulong real_start;
     abi_ulong real_last;
@@ -807,7 +807,7 @@ static void mmap_reserve_or_unmap(abi_ulong start, abi_ulong len)
             prot |= page_get_flags(a + 1);
         }
         if (prot != 0) {
-            return;
+            return 0;
         }
     } else {
         for (prot = 0, a = real_start; a < start; a += TARGET_PAGE_SIZE) {
@@ -825,7 +825,7 @@ static void mmap_reserve_or_unmap(abi_ulong start, abi_ulong len)
         }
 
         if (real_last < real_start) {
-            return;
+            return 0;
         }
     }
 
@@ -836,32 +836,36 @@ static void mmap_reserve_or_unmap(abi_ulong start, abi_ulong len)
         void *ptr = mmap(host_start, real_len, PROT_NONE,
                          MAP_FIXED | MAP_ANONYMOUS
                          | MAP_PRIVATE | MAP_NORESERVE, -1, 0);
-        assert(ptr == host_start);
-    } else {
-        int ret = munmap(host_start, real_len);
-        assert(ret == 0);
+        return ptr == host_start ? 0 : -1;
     }
+    return munmap(host_start, real_len);
 }
 
 int target_munmap(abi_ulong start, abi_ulong len)
 {
+    int ret;
+
     trace_target_munmap(start, len);
 
     if (start & ~TARGET_PAGE_MASK) {
-        return -TARGET_EINVAL;
+        errno = EINVAL;
+        return -1;
     }
     len = TARGET_PAGE_ALIGN(len);
     if (len == 0 || !guest_range_valid_untagged(start, len)) {
-        return -TARGET_EINVAL;
+        errno = EINVAL;
+        return -1;
     }
 
     mmap_lock();
-    mmap_reserve_or_unmap(start, len);
-    page_set_flags(start, start + len - 1, 0);
-    shm_region_rm_complete(start, start + len - 1);
+    ret = mmap_reserve_or_unmap(start, len);
+    if (likely(ret == 0)) {
+        page_set_flags(start, start + len - 1, 0);
+        shm_region_rm_complete(start, start + len - 1);
+    }
     mmap_unlock();
 
-    return 0;
+    return ret;
 }
 
 abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,