linux-kernel - [PATCH 4/4] exec: move the call to getname_flags into do

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Date:   Fri, 26 Mar 2021 15:38:31 +0100
From:   Christoph Hellwig <hch@....de>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>,
        Al Viro <viro@...iv.linux.org.uk>
Cc:     Arnd Bergmann <arnd@...db.de>, Brian Gerst <brgerst@...il.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, x86@...nel.org,
        linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
        sparclinux@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] exec: move the call to getname_flags into do_execveat

Remove the duplicated copying of the pathname into the common helper.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 fs/exec.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/fs/exec.c b/fs/exec.c
index b34c1eb9e7ad8e..5c0dd8f85fe7b5 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1843,13 +1843,16 @@ static int bprm_execve(struct linux_binprm *bprm,
 	return retval;
 }
 
-static int do_execveat(int fd, struct filename *filename,
+static int do_execveat(int fd, const char __user *pathname,
 		const char __user *const __user *argv,
 		const char __user *const __user *envp, int flags)
 {
+	int lookup_flags = (flags & AT_EMPTY_PATH) ? LOOKUP_EMPTY : 0;
+	struct filename *filename;
 	struct linux_binprm *bprm;
 	int retval;
 
+	filename = getname_flags(pathname, lookup_flags, NULL);
 	if (IS_ERR(filename))
 		return PTR_ERR(filename);
 
@@ -1993,7 +1996,7 @@ SYSCALL_DEFINE3(execve,
 		const char __user *const __user *, argv,
 		const char __user *const __user *, envp)
 {
-	return do_execveat(AT_FDCWD, getname(filename), argv, envp, 0);
+	return do_execveat(AT_FDCWD, filename, argv, envp, 0);
 }
 
 SYSCALL_DEFINE5(execveat,
@@ -2002,9 +2005,5 @@ SYSCALL_DEFINE5(execveat,
 		const char __user *const __user *, envp,
 		int, flags)
 {
-	int lookup_flags = (flags & AT_EMPTY_PATH) ? LOOKUP_EMPTY : 0;
-
-	return do_execveat(fd,
-			   getname_flags(filename, lookup_flags, NULL),
-			   argv, envp, flags);
+	return do_execveat(fd, filename, argv, envp, flags);
 }
-- 
2.30.1