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dcb8cbb58a
Drop the __init on kmemleak_test_init(). With it, the storage is
reclaimed, but then the symbol isn't available for "%pS" rendering,
and the backtrace gets a bare pointer where the actual leak happened.
unreferenced object 0xffff88800a2b0800 (size 1024):
comm "modprobe", pid 413, jiffies 4294953430
hex dump (first 32 bytes):
73 02 00 00 75 01 00 68 02 00 00 01 00 00 00 04 s...u..h........
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace:
[<00000000fabad728>] kmalloc_trace+0x26/0x90
[<00000000ef738764>] 0xffffffffc02350a2
[<00000000004e5795>] do_one_initcall+0x43/0x210
[<00000000d768905e>] do_init_module+0x4a/0x210
[<0000000087135ab5>] __do_sys_finit_module+0x93/0xf0
[<000000004fcb1fa2>] do_syscall_64+0x34/0x80
[<00000000c73c8d9d>] entry_SYSCALL_64_after_hwframe+0x46/0xb0
with __init gone, that trace entry renders like:
[<00000000ef738764>] kmemleak_test_init+<offset>/<size>
Link: https://lkml.kernel.org/r/20230525174356.69711-1-jim.cromie@gmail.com
Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* samples/kmemleak/kmemleak-test.c
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*
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* Copyright (C) 2008 ARM Limited
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* Written by Catalin Marinas <catalin.marinas@arm.com>
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*/
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#define pr_fmt(fmt) "kmemleak: " fmt
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/list.h>
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#include <linux/percpu.h>
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#include <linux/fdtable.h>
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#include <linux/kmemleak.h>
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struct test_node {
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long header[25];
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struct list_head list;
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long footer[25];
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};
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static LIST_HEAD(test_list);
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static DEFINE_PER_CPU(void *, kmemleak_test_pointer);
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/*
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* Some very simple testing. This function needs to be extended for
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* proper testing.
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*/
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static int kmemleak_test_init(void)
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{
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struct test_node *elem;
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int i;
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pr_info("Kmemleak testing\n");
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/* make some orphan objects */
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pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
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pr_info("kmalloc(32) = %p\n", kmalloc(32, GFP_KERNEL));
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pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
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pr_info("kmalloc(1024) = %p\n", kmalloc(1024, GFP_KERNEL));
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pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
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pr_info("kmalloc(2048) = %p\n", kmalloc(2048, GFP_KERNEL));
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pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
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pr_info("kmalloc(4096) = %p\n", kmalloc(4096, GFP_KERNEL));
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#ifndef CONFIG_MODULES
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pr_info("kmem_cache_alloc(files_cachep) = %p\n",
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kmem_cache_alloc(files_cachep, GFP_KERNEL));
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pr_info("kmem_cache_alloc(files_cachep) = %p\n",
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kmem_cache_alloc(files_cachep, GFP_KERNEL));
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#endif
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pr_info("vmalloc(64) = %p\n", vmalloc(64));
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pr_info("vmalloc(64) = %p\n", vmalloc(64));
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pr_info("vmalloc(64) = %p\n", vmalloc(64));
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pr_info("vmalloc(64) = %p\n", vmalloc(64));
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pr_info("vmalloc(64) = %p\n", vmalloc(64));
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/*
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* Add elements to a list. They should only appear as orphan
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* after the module is removed.
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*/
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for (i = 0; i < 10; i++) {
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elem = kzalloc(sizeof(*elem), GFP_KERNEL);
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pr_info("kzalloc(sizeof(*elem)) = %p\n", elem);
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if (!elem)
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return -ENOMEM;
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INIT_LIST_HEAD(&elem->list);
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list_add_tail(&elem->list, &test_list);
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}
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for_each_possible_cpu(i) {
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per_cpu(kmemleak_test_pointer, i) = kmalloc(129, GFP_KERNEL);
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pr_info("kmalloc(129) = %p\n",
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per_cpu(kmemleak_test_pointer, i));
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}
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return 0;
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}
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module_init(kmemleak_test_init);
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static void __exit kmemleak_test_exit(void)
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{
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struct test_node *elem, *tmp;
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/*
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* Remove the list elements without actually freeing the
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* memory.
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*/
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list_for_each_entry_safe(elem, tmp, &test_list, list)
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list_del(&elem->list);
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}
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module_exit(kmemleak_test_exit);
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MODULE_LICENSE("GPL");
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