[PATCH v2] seccomp: Remove bogus __user annotations

From: Jann Horn <jannh@google.com>
To: Kees Cook <keescook@chromium.org>
Cc: Andy Lutomirski <luto@amacapital.net>,
	Will Drewry <wad@chromium.org>,
	linux-kernel@vger.kernel.org, Tyler Hicks <code@tyhicks.com>,
	Christoph Hellwig <hch@lst.de>
Subject: [PATCH v2] seccomp: Remove bogus __user annotations
Date: Fri, 20 Nov 2020 18:05:45 +0100	[thread overview]
Message-ID: <20201120170545.1419332-1-jannh@google.com> (raw)

Buffers that are passed to read_actions_logged() and write_actions_logged()
are in kernel memory; the sysctl core takes care of copying from/to
userspace.

Fixes: 32927393dc1c ("sysctl: pass kernel pointers to ->proc_handler")
Reviewed-by: Tyler Hicks <code@tyhicks.com>
Signed-off-by: Jann Horn <jannh@google.com>
---
v2: corrected "Fixes" tag

 kernel/seccomp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/seccomp.c b/kernel/seccomp.c
index 8ad7a293255a..c2bff3561846 100644
--- a/kernel/seccomp.c
+++ b/kernel/seccomp.c
@@ -1968,7 +1968,7 @@ static bool seccomp_actions_logged_from_names(u32 *actions_logged, char *names)
 	return true;
 }
 
-static int read_actions_logged(struct ctl_table *ro_table, void __user *buffer,
+static int read_actions_logged(struct ctl_table *ro_table, void *buffer,
 			       size_t *lenp, loff_t *ppos)
 {
 	char names[sizeof(seccomp_actions_avail)];
@@ -1986,7 +1986,7 @@ static int read_actions_logged(struct ctl_table *ro_table, void __user *buffer,
 	return proc_dostring(&table, 0, buffer, lenp, ppos);
 }
 
-static int write_actions_logged(struct ctl_table *ro_table, void __user *buffer,
+static int write_actions_logged(struct ctl_table *ro_table, void *buffer,
 				size_t *lenp, loff_t *ppos, u32 *actions_logged)
 {
 	char names[sizeof(seccomp_actions_avail)];

base-commit: 4d02da974ea85a62074efedf354e82778f910d82
-- 
2.29.2.454.gaff20da3a2-goog

