diff options
Diffstat (limited to 'samples')
| -rw-r--r-- | samples/Makefile | 1 | ||||
| -rw-r--r-- | samples/bpf/hbm.c | 2 | ||||
| -rw-r--r-- | samples/kmemleak/Makefile | 3 | ||||
| -rw-r--r-- | samples/kmemleak/kmemleak-test.c | 99 | ||||
| -rw-r--r-- | samples/kprobes/kprobe_example.c | 8 | ||||
| -rw-r--r-- | samples/kprobes/kretprobe_example.c | 6 |
6 files changed, 111 insertions, 8 deletions
diff --git a/samples/Makefile b/samples/Makefile index 754553597581..c3392a595e4b 100644 --- a/samples/Makefile +++ b/samples/Makefile @@ -28,3 +28,4 @@ subdir-$(CONFIG_SAMPLE_VFS) += vfs obj-$(CONFIG_SAMPLE_INTEL_MEI) += mei/ subdir-$(CONFIG_SAMPLE_WATCHDOG) += watchdog subdir-$(CONFIG_SAMPLE_WATCH_QUEUE) += watch_queue +obj-$(CONFIG_DEBUG_KMEMLEAK_TEST) += kmemleak/ diff --git a/samples/bpf/hbm.c b/samples/bpf/hbm.c index 7d7153777678..4b22ace52f80 100644 --- a/samples/bpf/hbm.c +++ b/samples/bpf/hbm.c @@ -483,7 +483,7 @@ int main(int argc, char **argv) "Option -%c requires an argument.\n\n", optopt); case 'h': - // fallthrough + fallthrough; default: Usage(); return 0; diff --git a/samples/kmemleak/Makefile b/samples/kmemleak/Makefile new file mode 100644 index 000000000000..16b6132c540c --- /dev/null +++ b/samples/kmemleak/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0-only + +obj-$(CONFIG_DEBUG_KMEMLEAK_TEST) += kmemleak-test.o diff --git a/samples/kmemleak/kmemleak-test.c b/samples/kmemleak/kmemleak-test.c new file mode 100644 index 000000000000..7b476eb8285f --- /dev/null +++ b/samples/kmemleak/kmemleak-test.c @@ -0,0 +1,99 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * samples/kmemleak/kmemleak-test.c + * + * Copyright (C) 2008 ARM Limited + * Written by Catalin Marinas <catalin.marinas@arm.com> + */ + +#define pr_fmt(fmt) "kmemleak: " fmt + +#include <linux/init.h> +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/vmalloc.h> +#include <linux/list.h> +#include <linux/percpu.h> +#include <linux/fdtable.h> + +#include <linux/kmemleak.h> + +struct test_node { + long header[25]; + struct list_head list; + long footer[25]; +}; + +static LIST_HEAD(test_list); +static DEFINE_PER_CPU(void *, kmemleak_test_pointer); + +/* + * Some very simple testing. This function needs to be extended for + * proper testing. + */ +static int __init kmemleak_test_init(void) +{ + struct test_node *elem; + int i; + + pr_info("Kmemleak testing\n"); + + /* make some orphan objects */ + pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL)); + pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL)); + pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL)); + pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL)); + pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL)); + pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL)); + pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL)); + pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL)); +#ifndef CONFIG_MODULES + pr_info("kmem_cache_alloc(files_cachep) = %p\n", + kmem_cache_alloc(files_cachep, GFP_KERNEL)); + pr_info("kmem_cache_alloc(files_cachep) = %p\n", + kmem_cache_alloc(files_cachep, GFP_KERNEL)); +#endif + pr_info("vmalloc(64) = %p\n", vmalloc(64)); + pr_info("vmalloc(64) = %p\n", vmalloc(64)); + pr_info("vmalloc(64) = %p\n", vmalloc(64)); + pr_info("vmalloc(64) = %p\n", vmalloc(64)); + pr_info("vmalloc(64) = %p\n", vmalloc(64)); + + /* + * Add elements to a list. They should only appear as orphan + * after the module is removed. + */ + for (i = 0; i < 10; i++) { + elem = kzalloc(sizeof(*elem), GFP_KERNEL); + pr_info("kzalloc(sizeof(*elem)) = %p\n", elem); + if (!elem) + return -ENOMEM; + INIT_LIST_HEAD(&elem->list); + list_add_tail(&elem->list, &test_list); + } + + for_each_possible_cpu(i) { + per_cpu(kmemleak_test_pointer, i) = kmalloc(129, GFP_KERNEL); + pr_info("kmalloc(129) = %p\n", + per_cpu(kmemleak_test_pointer, i)); + } + + return 0; +} +module_init(kmemleak_test_init); + +static void __exit kmemleak_test_exit(void) +{ + struct test_node *elem, *tmp; + + /* + * Remove the list elements without actually freeing the + * memory. + */ + list_for_each_entry_safe(elem, tmp, &test_list, list) + list_del(&elem->list); +} +module_exit(kmemleak_test_exit); + +MODULE_LICENSE("GPL"); diff --git a/samples/kprobes/kprobe_example.c b/samples/kprobes/kprobe_example.c index 240f2435ce6f..365905cb24b1 100644 --- a/samples/kprobes/kprobe_example.c +++ b/samples/kprobes/kprobe_example.c @@ -2,13 +2,13 @@ /* * NOTE: This example is works on x86 and powerpc. * Here's a sample kernel module showing the use of kprobes to dump a - * stack trace and selected registers when _do_fork() is called. + * stack trace and selected registers when kernel_clone() is called. * * For more information on theory of operation of kprobes, see - * Documentation/staging/kprobes.rst + * Documentation/trace/kprobes.rst * * You will see the trace data in /var/log/messages and on the console - * whenever _do_fork() is invoked to create a new process. + * whenever kernel_clone() is invoked to create a new process. */ #include <linux/kernel.h> @@ -16,7 +16,7 @@ #include <linux/kprobes.h> #define MAX_SYMBOL_LEN 64 -static char symbol[MAX_SYMBOL_LEN] = "_do_fork"; +static char symbol[MAX_SYMBOL_LEN] = "kernel_clone"; module_param_string(symbol, symbol, sizeof(symbol), 0644); /* For each probe you need to allocate a kprobe structure */ diff --git a/samples/kprobes/kretprobe_example.c b/samples/kprobes/kretprobe_example.c index 78a2da6fb3cd..5dc1bf3baa98 100644 --- a/samples/kprobes/kretprobe_example.c +++ b/samples/kprobes/kretprobe_example.c @@ -8,10 +8,10 @@ * * usage: insmod kretprobe_example.ko func=<func_name> * - * If no func_name is specified, _do_fork is instrumented + * If no func_name is specified, kernel_clone is instrumented * * For more information on theory of operation of kretprobes, see - * Documentation/staging/kprobes.rst + * Documentation/trace/kprobes.rst * * Build and insert the kernel module as done in the kprobe example. * You will see the trace data in /var/log/messages and on the console @@ -26,7 +26,7 @@ #include <linux/limits.h> #include <linux/sched.h> -static char func_name[NAME_MAX] = "_do_fork"; +static char func_name[NAME_MAX] = "kernel_clone"; module_param_string(func, func_name, NAME_MAX, S_IRUGO); MODULE_PARM_DESC(func, "Function to kretprobe; this module will report the" " function's execution time"); |