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| author | Albert van der Linde <alinde@google.com> | 2020-10-16 06:13:50 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-16 21:11:22 +0300 |
| commit | 4d0e9df5e43dba52d38b251e3b909df8fa1110be (patch) | |
| tree | 6132ad46be683778740f7144820f465725a1b90e /lib/iov_iter.c | |
| parent | 2c739ced5886cd8c8361faa79a9522ec05174ed0 (diff) | |
| download | linux-4d0e9df5e43dba52d38b251e3b909df8fa1110be.tar.xz | |
lib, uaccess: add failure injection to usercopy functions
To test fault-tolerance of user memory access functions, introduce fault
injection to usercopy functions.
If a failure is expected return either -EFAULT or the total amount of
bytes that were not copied.
Signed-off-by: Albert van der Linde <alinde@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Akinobu Mita <akinobu.mita@gmail.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Marco Elver <elver@google.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Christoph Hellwig <hch@lst.de>
Link: http://lkml.kernel.org/r/20200831171733.955393-3-alinde@google.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib/iov_iter.c')
| -rw-r--r-- | lib/iov_iter.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/iov_iter.c b/lib/iov_iter.c index 14cae2584db4..1635111c5bd2 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -2,6 +2,7 @@ #include <crypto/hash.h> #include <linux/export.h> #include <linux/bvec.h> +#include <linux/fault-inject-usercopy.h> #include <linux/uio.h> #include <linux/pagemap.h> #include <linux/slab.h> @@ -140,6 +141,8 @@ static int copyout(void __user *to, const void *from, size_t n) { + if (should_fail_usercopy()) + return n; if (access_ok(to, n)) { instrument_copy_to_user(to, from, n); n = raw_copy_to_user(to, from, n); @@ -149,6 +152,8 @@ static int copyout(void __user *to, const void *from, size_t n) static int copyin(void *to, const void __user *from, size_t n) { + if (should_fail_usercopy()) + return n; if (access_ok(from, n)) { instrument_copy_from_user(to, from, n); n = raw_copy_from_user(to, from, n); |