diff options
Diffstat (limited to 'lib/usercopy.c')
| -rw-r--r-- | lib/usercopy.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/lib/usercopy.c b/lib/usercopy.c index b26509f112f9..7413dd300516 100644 --- a/lib/usercopy.c +++ b/lib/usercopy.c @@ -1,5 +1,6 @@ // SPDX-License-Identifier: GPL-2.0 #include <linux/bitops.h> +#include <linux/fault-inject-usercopy.h> #include <linux/instrumented.h> #include <linux/uaccess.h> @@ -10,7 +11,7 @@ unsigned long _copy_from_user(void *to, const void __user *from, unsigned long n { unsigned long res = n; might_fault(); - if (likely(access_ok(from, n))) { + if (!should_fail_usercopy() && likely(access_ok(from, n))) { instrument_copy_from_user(to, from, n); res = raw_copy_from_user(to, from, n); } @@ -25,6 +26,8 @@ EXPORT_SYMBOL(_copy_from_user); unsigned long _copy_to_user(void __user *to, const void *from, unsigned long n) { might_fault(); + if (should_fail_usercopy()) + return n; if (likely(access_ok(to, n))) { instrument_copy_to_user(to, from, n); n = raw_copy_to_user(to, from, n); |