[PATCH v3 2/4] linux-user: replace strerror() function to the thread safe qemu_strerror()

[Yohei Kojima]

strerror() is not guaranteed to be thread-safe as described in
(https://gitlab.com/qemu-project/qemu/-/issues/416).

This commit changes files under /linux-user that call strerror() to call
the safer qemu_strerror().

Signed-off-by: Yohei Kojima <y-...@outlook.jp>
Reviewed-by: Alex Bennée <alex.ben...@linaro.org>
---
 linux-user/elfload.c | 6 ++++--
 linux-user/main.c    | 5 +++--
 linux-user/syscall.c | 2 +-
 3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index b96b3e566b..0fde7de735 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -17,6 +17,7 @@
 #include "qemu/guest-random.h"
 #include "qemu/units.h"
 #include "qemu/selfmap.h"
+#include "qemu/cutils.h"
 #include "qapi/error.h"
 #include "qemu/error-report.h"
 #include "target_signal.h"
@@ -2790,7 +2791,8 @@ static void pgb_reserved_va(const char *image_name, 
abi_ulong guest_loaddr,
         error_report("Unable to reserve 0x%lx bytes of virtual address "
                      "space at %p (%s) for use as guest address space (check 
your "
                      "virtual memory ulimit setting, min_mmap_addr or reserve 
less "
-                     "using -R option)", reserved_va + 1, test, 
strerror(errno));
+                     "using -R option)", reserved_va + 1, test,
+                     qemu_strerror(errno));
         exit(EXIT_FAILURE);
     }
 
@@ -3583,7 +3585,7 @@ int load_elf_binary(struct linux_binprm *bprm, struct 
image_info *info)
     g_free(scratch);
 
     if (!bprm->p) {
-        fprintf(stderr, "%s: %s\n", bprm->filename, strerror(E2BIG));
+        fprintf(stderr, "%s: %s\n", bprm->filename, qemu_strerror(E2BIG));
         exit(-1);
     }
 
diff --git a/linux-user/main.c b/linux-user/main.c
index fe03293516..953b8ede65 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -746,7 +746,8 @@ int main(int argc, char **argv, char **envp)
     if (execfd == 0) {
         execfd = open(exec_path, O_RDONLY);
         if (execfd < 0) {
-            printf("Error while loading %s: %s\n", exec_path, strerror(errno));
+            printf("Error while loading %s: %s\n", exec_path,
+                   qemu_strerror(errno));
             _exit(EXIT_FAILURE);
         }
     }
@@ -892,7 +893,7 @@ int main(int argc, char **argv, char **envp)
     ret = loader_exec(execfd, exec_path, target_argv, target_environ, regs,
         info, &bprm);
     if (ret != 0) {
-        printf("Error while loading %s: %s\n", exec_path, strerror(-ret));
+        printf("Error while loading %s: %s\n", exec_path, qemu_strerror(-ret));
         _exit(EXIT_FAILURE);
     }
 
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 69f740ff98..f6b4fe8059 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -581,7 +581,7 @@ const char *target_strerror(int err)
         return "Successful exit from sigreturn";
     }
 
-    return strerror(target_to_host_errno(err));
+    return qemu_strerror(target_to_host_errno(err));
 }
 
 static int check_zeroed_user(abi_long addr, size_t ksize, size_t usize)
-- 
2.39.2