[PATCH v5 5/5] linux-user/syscall: Implement execveat()

["Philippe Mathieu-Daudé" <philmd@linaro.org>]

From: Drew DeVault <sir@cmpwn.com>

References: https://gitlab.com/qemu-project/qemu/-/issues/1007
Signed-off-by: Drew DeVault <sir@cmpwn.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20221104081015.706009-1-sir@cmpwn.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 linux-user/syscall.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index c3ac6bb4d2..c267db9542 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -696,7 +696,8 @@ safe_syscall4(pid_t, wait4, pid_t, pid, int *, status, int, options, \
 #endif
 safe_syscall5(int, waitid, idtype_t, idtype, id_t, id, siginfo_t *, infop, \
               int, options, struct rusage *, rusage)
-safe_syscall3(int, execve, const char *, filename, char **, argv, char **, envp)
+safe_syscall5(int, execveat, int, dirfd, const char *, filename,
+              char **, argv, char **, envp, int, flags)
 #if defined(TARGET_NR_select) || defined(TARGET_NR__newselect) || \
     defined(TARGET_NR_pselect6) || defined(TARGET_NR_pselect6_time64)
 safe_syscall6(int, pselect6, int, nfds, fd_set *, readfds, fd_set *, writefds, \
@@ -8357,9 +8358,9 @@ static int do_openat(CPUArchState *cpu_env, int dirfd, const char *pathname, int
     return safe_openat(dirfd, path(pathname), flags, mode);
 }
 
-static int do_execve(CPUArchState *cpu_env,
+static int do_execveat(CPUArchState *cpu_env, int dirfd,
                        abi_long pathname, abi_long guest_argp,
-                       abi_long guest_envp)
+                       abi_long guest_envp, int flags)
 {
     int ret;
     char **argp, **envp;
@@ -8439,9 +8440,9 @@ static int do_execve(CPUArchState *cpu_env,
     }
 
     if (is_proc_myself(p, "exe")) {
-        ret = get_errno(safe_execve(exec_path, argp, envp));
+        ret = get_errno(safe_execveat(dirfd, exec_path, argp, envp, flags));
     } else {
-        ret = get_errno(safe_execve(p, argp, envp));
+        ret = get_errno(safe_execveat(dirfd, p, argp, envp, flags));
     }
 
     unlock_user(p, pathname, 0);
@@ -8979,8 +8980,10 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1,
         unlock_user(p, arg2, 0);
         return ret;
 #endif
+    case TARGET_NR_execveat:
+        return do_execveat(cpu_env, arg1, arg2, arg3, arg4, arg5);
     case TARGET_NR_execve:
-        return do_execve(cpu_env, arg1, arg2, arg3);
+        return do_execveat(cpu_env, AT_FDCWD, arg1, arg2, arg3, 0);
     case TARGET_NR_chdir:
         if (!(p = lock_user_string(arg1)))
             return -TARGET_EFAULT;
-- 
2.38.1