lkml.org 
[lkml]   [2021]   [Feb]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 03/20] devlink: Manual replacement of the deprecated strlcpy() with return values
Date
The strlcpy() reads the entire source buffer first, it is dangerous if
the source buffer lenght is unbounded or possibility non NULL-terminated.
It can lead to linear read overflows, crashes, etc...

As recommended in the deprecated interfaces [1], it should be replaced
by strscpy.

This commit replaces all calls to strlcpy that handle the return values
by the corresponding strscpy calls with new handling of the return
values (as it is quite different between the two functions).

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy

Signed-off-by: Romain Perier <romain.perier@gmail.com>
---
net/core/devlink.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/core/devlink.c b/net/core/devlink.c
index 737b61c2976e..7eb445460c92 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -9461,10 +9461,10 @@ EXPORT_SYMBOL_GPL(devlink_port_param_value_changed);
void devlink_param_value_str_fill(union devlink_param_value *dst_val,
const char *src)
{
- size_t len;
+ ssize_t len;

- len = strlcpy(dst_val->vstr, src, __DEVLINK_PARAM_MAX_STRING_VALUE);
- WARN_ON(len >= __DEVLINK_PARAM_MAX_STRING_VALUE);
+ len = strscpy(dst_val->vstr, src, __DEVLINK_PARAM_MAX_STRING_VALUE);
+ WARN_ON(len == -E2BIG);
}
EXPORT_SYMBOL_GPL(devlink_param_value_str_fill);

\
 
 \ /
  Last update: 2021-02-22 16:17    [W:0.209 / U:0.112 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site