From 38b983b3461e7d3c64a981e2338bb34605c46f30 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sun, 30 Sep 2012 13:38:55 -0400
Subject: [PATCH] generic sys_execve()
Selected by __ARCH_WANT_SYS_EXECVE in unistd.h. Requires
* working current_pt_regs()
* *NOT* doing a syscall-in-kernel kind of kernel_execve()
implementation. Using generic kernel_execve() is fine.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/exec.c | 38 ++++++++++++++++++++++++++++++++++----
include/linux/compat.h | 8 ++++++--
2 files changed, 40 insertions(+), 6 deletions(-)
diff --git a/fs/exec.c b/fs/exec.c
index 48c525115fe4d8..50a1270da95b4b 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -401,7 +401,7 @@ struct user_arg_ptr {
union {
const char __user *const __user *native;
#ifdef CONFIG_COMPAT
- compat_uptr_t __user *compat;
+ const compat_uptr_t __user *compat;
#endif
} ptr;
};
@@ -1600,9 +1600,9 @@ int do_execve(const char *filename,
}
#ifdef CONFIG_COMPAT
-int compat_do_execve(char *filename,
- compat_uptr_t __user *__argv,
- compat_uptr_t __user *__envp,
+int compat_do_execve(const char *filename,
+ const compat_uptr_t __user *__argv,
+ const compat_uptr_t __user *__envp,
struct pt_regs *regs)
{
struct user_arg_ptr argv = {
@@ -2319,6 +2319,36 @@ int dump_seek(struct file *file, loff_t off)
}
EXPORT_SYMBOL(dump_seek);
+#ifdef __ARCH_WANT_SYS_EXECVE
+SYSCALL_DEFINE3(execve,
+ const char __user *, filename,
+ const char __user *const __user *, argv,
+ const char __user *const __user *, envp)
+{
+ const char *path = getname(filename);
+ int error = PTR_ERR(path);
+ if (!IS_ERR(path)) {
+ error = do_execve(path, argv, envp, current_pt_regs());
+ putname(path);
+ }
+ return error;
+}
+#ifdef CONFIG_COMPAT
+asmlinkage long compat_sys_execve(const char __user * filename,
+ const compat_uptr_t __user * argv,
+ const compat_uptr_t __user * envp)
+{
+ const char *path = getname(filename);
+ int error = PTR_ERR(path);
+ if (!IS_ERR(path)) {
+ error = compat_do_execve(path, argv, envp, current_pt_regs());
+ putname(path);
+ }
+ return error;
+}
+#endif
+#endif
+
#ifdef __ARCH_WANT_KERNEL_EXECVE
int kernel_execve(const char *filename,
const char *const argv[],
diff --git a/include/linux/compat.h b/include/linux/compat.h
index 09b28b7369d77e..c4be3f55511d65 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -289,8 +289,12 @@ asmlinkage ssize_t compat_sys_pwritev(unsigned long fd,
const struct compat_iovec __user *vec,
unsigned long vlen, u32 pos_low, u32 pos_high);
-int compat_do_execve(char *filename, compat_uptr_t __user *argv,
- compat_uptr_t __user *envp, struct pt_regs *regs);
+int compat_do_execve(const char *filename, const compat_uptr_t __user *argv,
+ const compat_uptr_t __user *envp, struct pt_regs *regs);
+#ifdef __ARCH_WANT_SYS_EXECVE
+asmlinkage long compat_sys_execve(const char __user *filename, const compat_uptr_t __user *argv,
+ const compat_uptr_t __user *envp);
+#endif
asmlinkage long compat_sys_select(int n, compat_ulong_t __user *inp,
compat_ulong_t __user *outp, compat_ulong_t __user *exp,
--
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