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strlen_overflow: cleanup after reddit rush

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Ciro Santilli
2018-05-05 09:09:12 +01:00
parent 1b451a70d4
commit 149ab9302b
1 changed files with 5 additions and 9 deletions
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14
kernel_module/strlen_overflow.c
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@@ -1,18 +1,14 @@
/*
https://www.reddit.com/r/hacking/comments/8h4qxk/what_a_buffer_overflow_in_the_linux_kernel_looks/
*/
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/string.h> #include <linux/string.h>
static int myinit(void) static int myinit(void)
{ {
enum { size = 256 }; char buf[] = {'p', 'w', 'n'};
int i = 1;
char buf[size];
char buf2[size];
for (i = 0; i < size; i++) {
buf[i] = 'a';
buf2[i] = 'b';
}
/*char buf[] = {'p', 'w', 'n'};*/
pr_info("%llu\n", (long long unsigned)strlen(buf)); pr_info("%llu\n", (long long unsigned)strlen(buf));
return 0; return 0;
} }