Commit 6b5aef7cac for qemu.org

commit 6b5aef7cac9dab7c16451588cff6615eb2048293
Author: Helge Deller <deller@gmx.de>
Date:   Fri May 1 12:56:12 2026 +0200

    linux-user: Fix AT_EXECFN in AUXV for symlinked programs

    The AT_EXECFN entry in AUXV needs to keep the value which was used when
    the program was started. Especially for symlinked programs qemu should
    not try to resolve the realpath.

    Here is a reproducer:
    (arm64-chroot)root@p100:/# cd /usr/bin
    (arm64-chroot)root@p100:/usr/bin# ln -s echo testprog
    (arm64-chroot)root@p100:/usr/bin# LD_SHOW_AUXV=1 ./testprog | grep AT_EXECFN
    AT_EXECFN:            ./testprog

    In this example, "./testprog" is the correct output, and not "/usr/bin/echo".

    This patch fixes parts of commit 258bec39 ("linux-user: Fix access to
    /proc/self/exe").

    Fixes: 258bec39 ("linux-user: Fix access to /proc/self/exe")
    Resolves: https://gitlab.com/qemu-project/qemu/-/work_items/3379
    Signed-off-by: Helge Deller <deller@gmx.de>

diff --git a/linux-user/main.c b/linux-user/main.c
index 86d04cca3c..c08c73fd80 100644
--- a/linux-user/main.c
+++ b/linux-user/main.c
@@ -772,8 +772,10 @@ int main(int argc, char **argv, char **envp)
     }

     /* Resolve executable file name to full path name */
-    if (realpath(exec_path, real_exec_path)) {
-        exec_path = real_exec_path;
+    /* Keep how we started the program in exec_path, e.g. "./my_program" */
+    /* Store real path in real_exec_path, e.g. "/usr/local/bin/my_program" */
+    if (!realpath(exec_path, real_exec_path)) {
+        printf("Could not resolve %s\n", exec_path);
     }

     /*
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index d3d9fffb54..65bbeb8551 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -8790,9 +8790,9 @@ static int maybe_do_fake_open(CPUArchState *cpu_env, int dirfd,
             return -1;
         }
         if (safe) {
-            return safe_openat(dirfd, exec_path, flags, mode);
+            return safe_openat(dirfd, real_exec_path, flags, mode);
         } else {
-            return openat(dirfd, exec_path, flags, mode);
+            return openat(dirfd, real_exec_path, flags, mode);
         }
     }

@@ -8929,9 +8929,9 @@ ssize_t do_guest_readlink(const char *pathname, char *buf, size_t bufsiz)
          * Don't worry about sign mismatch as earlier mapping
          * logic would have thrown a bad address error.
          */
-        ret = MIN(strlen(exec_path), bufsiz);
+        ret = MIN(strlen(real_exec_path), bufsiz);
         /* We cannot NUL terminate the string. */
-        memcpy(buf, exec_path, ret);
+        memcpy(buf, real_exec_path, ret);
     } else {
         ret = readlink(path(pathname), buf, bufsiz);
     }
@@ -9022,7 +9022,7 @@ static int do_execv(CPUArchState *cpu_env, int dirfd,

     const char *exe = p;
     if (is_proc_myself(p, "exe")) {
-        exe = exec_path;
+        exe = real_exec_path;
     }
     ret = is_execveat
         ? safe_execveat(dirfd, exe, argp, envp, flags)
@@ -11033,9 +11033,9 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1,
                  * Don't worry about sign mismatch as earlier mapping
                  * logic would have thrown a bad address error.
                  */
-                ret = MIN(strlen(exec_path), arg4);
+                ret = MIN(strlen(real_exec_path), arg4);
                 /* We cannot NUL terminate the string. */
-                memcpy(p2, exec_path, ret);
+                memcpy(p2, real_exec_path, ret);
             } else {
                 ret = get_errno(readlinkat(arg1, path(p), p2, arg4));
             }
diff --git a/linux-user/user-internals.h b/linux-user/user-internals.h
index e65373b204..21daf422b7 100644
--- a/linux-user/user-internals.h
+++ b/linux-user/user-internals.h
@@ -24,6 +24,7 @@
 #include "exec/translation-block.h"

 extern char *exec_path;
+extern char real_exec_path[PATH_MAX];
 void init_task_state(TaskState *ts);
 void task_settid(TaskState *);
 void stop_all_tasks(void);