[net-next,v2,1/2] bpf: Move check_uarg_tail_zero() upward
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Message ID 20170807184520.8130-1-mic@digikod.net
State New, archived
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Series
  • [net-next,v2,1/2] bpf: Move check_uarg_tail_zero() upward
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Commit Message

Mickaël Salaün Aug. 7, 2017, 6:45 p.m. UTC
The function check_uarg_tail_zero() may be useful for other part of the
code in the syscall.c file. Move this function at the beginning of the
file.

Signed-off-by: Mickaël Salaün <mic@digikod.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Kees Cook <keescook@chromium.org>
Cc: Martin KaFai Lau <kafai@fb.com>
---

This is needed for the Landlock patch series. :)
---
 kernel/bpf/syscall.c | 52 ++++++++++++++++++++++++++--------------------------
 1 file changed, 26 insertions(+), 26 deletions(-)

Comments

David Miller Aug. 9, 2017, 1:11 a.m. UTC | #1
From: Mickaël Salaün <mic@digikod.net>
Date: Mon,  7 Aug 2017 20:45:19 +0200

> The function check_uarg_tail_zero() may be useful for other part of the
> code in the syscall.c file. Move this function at the beginning of the
> file.
> 
> Signed-off-by: Mickaël Salaün <mic@digikod.net>
> Acked-by: Daniel Borkmann <daniel@iogearbox.net>

Applied.

Patch
diff mbox series

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 6c772adabad2..c653ee0bd162 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -48,6 +48,32 @@  static const struct bpf_map_ops * const bpf_map_types[] = {
 #undef BPF_MAP_TYPE
 };
 
+static int check_uarg_tail_zero(void __user *uaddr,
+				size_t expected_size,
+				size_t actual_size)
+{
+	unsigned char __user *addr;
+	unsigned char __user *end;
+	unsigned char val;
+	int err;
+
+	if (actual_size <= expected_size)
+		return 0;
+
+	addr = uaddr + expected_size;
+	end  = uaddr + actual_size;
+
+	for (; addr < end; addr++) {
+		err = get_user(val, addr);
+		if (err)
+			return err;
+		if (val)
+			return -E2BIG;
+	}
+
+	return 0;
+}
+
 static struct bpf_map *find_and_alloc_map(union bpf_attr *attr)
 {
 	struct bpf_map *map;
@@ -1246,32 +1272,6 @@  static int bpf_map_get_fd_by_id(const union bpf_attr *attr)
 	return fd;
 }
 
-static int check_uarg_tail_zero(void __user *uaddr,
-				size_t expected_size,
-				size_t actual_size)
-{
-	unsigned char __user *addr;
-	unsigned char __user *end;
-	unsigned char val;
-	int err;
-
-	if (actual_size <= expected_size)
-		return 0;
-
-	addr = uaddr + expected_size;
-	end  = uaddr + actual_size;
-
-	for (; addr < end; addr++) {
-		err = get_user(val, addr);
-		if (err)
-			return err;
-		if (val)
-			return -E2BIG;
-	}
-
-	return 0;
-}
-
 static int bpf_prog_get_info_by_fd(struct bpf_prog *prog,
 				   const union bpf_attr *attr,
 				   union bpf_attr __user *uattr)