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x86, um/x86: switch to generic sys_execve and kernel_execve

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32bit wrapper is lost on that; 64bit one is *not*, since
we need to arrange for full pt_regs on stack when we call
sys_execve() and we need to load callee-saved ones from
there afterwards.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2012-08-02 23:05:11 +04:00
parent 7076aada10
commit 6783eaa2e1
17 changed files with 34 additions and 158 deletions
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25
arch/um/kernel/exec.c
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@@ -16,7 +16,6 @@
#include "mem_user.h"
#include "skas.h"
#include "os.h"
#include "internal.h"
void flush_thread(void)
{
@@ -49,27 +48,7 @@ void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
}
EXPORT_SYMBOL(start_thread);
long um_execve(const char *file, const char __user *const __user *argv, const char __user *const __user *env)
void __noreturn ret_from_kernel_execve(struct pt_regs *unused)
{
long err;
err = do_execve(file, argv, env, &current->thread.regs);
if (!err)
UML_LONGJMP(current->thread.exec_buf, 1);
return err;
}
long sys_execve(const char __user *file, const char __user *const __user *argv,
const char __user *const __user *env)
{
long error;
char *filename;
filename = getname(file);
error = PTR_ERR(filename);
if (IS_ERR(filename)) goto out;
error = do_execve(filename, argv, env, &current->thread.regs);
putname(filename);
out:
return error;
UML_LONGJMP(current->thread.exec_buf, 1);
}