All of them are wrappers for do_execveat_common() and each has exactly one caller. The only difference is in the way they are constructing argv/envp arguments for do_execveat_common() and that's easy to do with less boilerplate.
Signed-off-by: Al Viro <[email protected]> --- fs/exec.c | 80 +++++++++++++------------------------------------------ 1 file changed, 19 insertions(+), 61 deletions(-) diff --git a/fs/exec.c b/fs/exec.c index 902561a878ff..4e192d7b7e71 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1893,59 +1893,6 @@ int kernel_execve(const char *kernel_filename, return bprm_execve(bprm); } -static int do_execve(struct filename *filename, - const char __user *const __user *__argv, - const char __user *const __user *__envp) -{ - struct user_arg_ptr argv = { .ptr.native = __argv }; - struct user_arg_ptr envp = { .ptr.native = __envp }; - return do_execveat_common(AT_FDCWD, filename, argv, envp, 0); -} - -static int do_execveat(int fd, struct filename *filename, - const char __user *const __user *__argv, - const char __user *const __user *__envp, - int flags) -{ - struct user_arg_ptr argv = { .ptr.native = __argv }; - struct user_arg_ptr envp = { .ptr.native = __envp }; - - return do_execveat_common(fd, filename, argv, envp, flags); -} - -#ifdef CONFIG_COMPAT -static int compat_do_execve(struct filename *filename, - const compat_uptr_t __user *__argv, - const compat_uptr_t __user *__envp) -{ - struct user_arg_ptr argv = { - .is_compat = true, - .ptr.compat = __argv, - }; - struct user_arg_ptr envp = { - .is_compat = true, - .ptr.compat = __envp, - }; - return do_execveat_common(AT_FDCWD, filename, argv, envp, 0); -} - -static int compat_do_execveat(int fd, struct filename *filename, - const compat_uptr_t __user *__argv, - const compat_uptr_t __user *__envp, - int flags) -{ - struct user_arg_ptr argv = { - .is_compat = true, - .ptr.compat = __argv, - }; - struct user_arg_ptr envp = { - .is_compat = true, - .ptr.compat = __envp, - }; - return do_execveat_common(fd, filename, argv, envp, flags); -} -#endif - void set_binfmt(struct linux_binfmt *new) { struct mm_struct *mm = current->mm; @@ -1970,12 +1917,18 @@ void set_dumpable(struct mm_struct *mm, int value) __mm_flags_set_mask_dumpable(mm, value); } +static inline struct user_arg_ptr native_arg(const char __user *const __user *p) +{ + return (struct user_arg_ptr){.ptr.native = p}; +} + SYSCALL_DEFINE3(execve, const char __user *, filename, const char __user *const __user *, argv, const char __user *const __user *, envp) { - return do_execve(getname(filename), argv, envp); + return do_execveat_common(AT_FDCWD, getname(filename), + native_arg(argv), native_arg(envp), 0); } SYSCALL_DEFINE5(execveat, @@ -1984,17 +1937,23 @@ SYSCALL_DEFINE5(execveat, const char __user *const __user *, envp, int, flags) { - return do_execveat(fd, - getname_uflags(filename, flags), - argv, envp, flags); + return do_execveat_common(fd, getname_uflags(filename, flags), + native_arg(argv), native_arg(envp), flags); } #ifdef CONFIG_COMPAT + +static inline struct user_arg_ptr compat_arg(const compat_uptr_t __user *p) +{ + return (struct user_arg_ptr){.is_compat = true, .ptr.compat = p}; +} + COMPAT_SYSCALL_DEFINE3(execve, const char __user *, filename, const compat_uptr_t __user *, argv, const compat_uptr_t __user *, envp) { - return compat_do_execve(getname(filename), argv, envp); + return do_execveat_common(AT_FDCWD, getname(filename), + compat_arg(argv), compat_arg(envp), 0); } COMPAT_SYSCALL_DEFINE5(execveat, int, fd, @@ -2003,9 +1962,8 @@ COMPAT_SYSCALL_DEFINE5(execveat, int, fd, const compat_uptr_t __user *, envp, int, flags) { - return compat_do_execveat(fd, - getname_uflags(filename, flags), - argv, envp, flags); + return do_execveat_common(fd, getname_uflags(filename, flags), + compat_arg(argv), compat_arg(envp), flags); } #endif -- 2.47.3
