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| author | Javier Martinez Canillas <javier@dowhile0.org> | 2018-02-25 23:16:18 +0100 |
|---|---|---|
| committer | Javier Martinez Canillas <javier@dowhile0.org> | 2018-02-25 23:21:14 +0100 |
| commit | 799788bab2730fa21bfa59b234f98d98c2feeea7 (patch) | |
| tree | 9651b2a6f2fcc39f2a0d1605c0f9fa00568bff9e | |
| parent | 11b2dfc91f5ff185262c4bd8d3365b70035ecfe2 (diff) | |
| download | ldd3-799788bab2730fa21bfa59b234f98d98c2feeea7.tar.gz | |
misc-modules: faulty: Open code memset() to allow a buffer overflow
The memset() function is now fortified, which means that provides both a
compile and runtime buffer overflow checks. Since the goal of the faulty
module is to cause a buffer overflow this function can't be used anymore
and instead have to be open coded.
Signed-off-by: Javier Martinez Canillas <javier@dowhile0.org>
| -rw-r--r-- | misc-modules/faulty.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/misc-modules/faulty.c b/misc-modules/faulty.c index 95038b7..c6c44b4 100644 --- a/misc-modules/faulty.c +++ b/misc-modules/faulty.c @@ -31,11 +31,13 @@ int faulty_major = 0; ssize_t faulty_read(struct file *filp, char __user *buf, size_t count, loff_t *pos) { + int i; int ret; char stack_buf[4]; /* Let's try a buffer overflow */ - memset(stack_buf, 0xff, 20); + for (i = 0; i < 20; i++) + *(stack_buf + i) = 0xff; if (count > 4) count = 4; /* copy 4 bytes to the user */ ret = copy_to_user(buf, stack_buf, count); |