diff options
| author | Albert van der Linde <alinde@google.com> | 2020-10-15 20:13:46 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-16 11:11:22 -0700 |
| commit | 2c739ced5886cd8c8361faa79a9522ec05174ed0 (patch) | |
| tree | 6fb1604ea92b92f1300d1dc249e352cd3709ba7e /Documentation | |
| parent | d9bc85de46cad90851c346b592005090674b7669 (diff) | |
lib, include/linux: add usercopy failure capability
Patch series "add fault injection to user memory access", v3.
The goal of this series is to improve testing of fault-tolerance in usages
of user memory access functions, by adding support for fault injection.
syzkaller/syzbot are using the existing fault injection modes and will use
this particular feature also.
The first patch adds failure injection capability for usercopy functions.
The second changes usercopy functions to use this new failure capability
(copy_from_user, ...). The third patch adds get/put/clear_user failures
to x86.
This patch (of 3):
Add a failure injection capability to improve testing of fault-tolerance
in usages of user memory access functions.
Add CONFIG_FAULT_INJECTION_USERCOPY to enable faults in usercopy
functions. The should_fail_usercopy function is to be called by these
functions (copy_from_user, get_user, ...) in order to fail or not.
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: Borislav Petkov <bp@alien8.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrey Konovalov <andreyknvl@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Marco Elver <elver@google.com>
Cc: Christoph Hellwig <hch@lst.de>
Link: http://lkml.kernel.org/r/20200831171733.955393-1-alinde@google.com
Link: http://lkml.kernel.org/r/20200831171733.955393-2-alinde@google.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 1 | ||||
| -rw-r--r-- | Documentation/fault-injection/fault-injection.rst | 7 |
2 files changed, 7 insertions, 1 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index f7ac0e663976..6d9afb221ff7 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -1343,6 +1343,7 @@ current integrity status. failslab= + fail_usercopy= fail_page_alloc= fail_make_request=[KNL] General fault injection mechanism. diff --git a/Documentation/fault-injection/fault-injection.rst b/Documentation/fault-injection/fault-injection.rst index f850ad018b70..31ecfe44e5b4 100644 --- a/Documentation/fault-injection/fault-injection.rst +++ b/Documentation/fault-injection/fault-injection.rst @@ -16,6 +16,10 @@ Available fault injection capabilities injects page allocation failures. (alloc_pages(), get_free_pages(), ...) +- fail_usercopy + + injects failures in user memory access functions. (copy_from_user(), get_user(), ...) + - fail_futex injects futex deadlock and uaddr fault errors. @@ -177,6 +181,7 @@ use the boot option:: failslab= fail_page_alloc= + fail_usercopy= fail_make_request= fail_futex= mmc_core.fail_request=<interval>,<probability>,<space>,<times> @@ -222,7 +227,7 @@ How to add new fault injection capability - debugfs entries - failslab, fail_page_alloc, and fail_make_request use this way. + failslab, fail_page_alloc, fail_usercopy, and fail_make_request use this way. Helper functions: fault_create_debugfs_attr(name, parent, attr); |