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authorEric W. Biederman <ebiederm@xmission.com>2020-07-13 12:06:48 -0500
committerEric W. Biederman <ebiederm@xmission.com>2020-07-21 08:24:52 -0500
commitbe619f7f063a49c656f620a46af4f8ea3e759e91 (patch)
treebe0f257b8da82e9e2eb9bdaa2574a48221e7b516 /include/linux/binfmts.h
parentd8b9cd549ecf0f3dc8da42ada5f0ce73e8ed5f1e (diff)
exec: Implement kernel_execve
To allow the kernel not to play games with set_fs to call exec implement kernel_execve. The function kernel_execve takes pointers into kernel memory and copies the values pointed to onto the new userspace stack. The calls with arguments from kernel space of do_execve are replaced with calls to kernel_execve. The calls do_execve and do_execveat are made static as there are now no callers outside of exec. The comments that mention do_execve are updated to refer to kernel_execve or execve depending on the circumstances. In addition to correcting the comments, this makes it easy to grep for do_execve and verify it is not used. Inspired-by: https://lkml.kernel.org/r/20200627072704.2447163-1-hch@lst.de Reviewed-by: Kees Cook <keescook@chromium.org> Link: https://lkml.kernel.org/r/87wo365ikj.fsf@x220.int.ebiederm.org Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'include/linux/binfmts.h')
-rw-r--r--include/linux/binfmts.h9
1 files changed, 2 insertions, 7 deletions
diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h
index 8e9e1b0c8eb8..0571701ab1c5 100644
--- a/include/linux/binfmts.h
+++ b/include/linux/binfmts.h
@@ -135,12 +135,7 @@ int copy_string_kernel(const char *arg, struct linux_binprm *bprm);
extern void set_binfmt(struct linux_binfmt *new);
extern ssize_t read_code(struct file *, unsigned long, loff_t, size_t);
-extern int do_execve(struct filename *,
- const char __user * const __user *,
- const char __user * const __user *);
-extern int do_execveat(int, struct filename *,
- const char __user * const __user *,
- const char __user * const __user *,
- int);
+int kernel_execve(const char *filename,
+ const char *const *argv, const char *const *envp);
#endif /* _LINUX_BINFMTS_H */