mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-08-27 15:36:48 +00:00
f5769359c5
When loading a module, as long as the module has memory allocation
operations, kmemleak produces a false positive report that resembles the
following:
unreferenced object (percpu) 0x7dfd232a1650 (size 16):
comm "modprobe", pid 1301, jiffies 4294940249
hex dump (first 16 bytes on cpu 2):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc 0):
kmemleak_alloc_percpu+0xb4/0xd0
pcpu_alloc_noprof+0x700/0x1098
load_module+0xd4/0x348
codetag_module_init+0x20c/0x450
codetag_load_module+0x70/0xb8
load_module+0xef8/0x1608
init_module_from_file+0xec/0x158
idempotent_init_module+0x354/0x608
__arm64_sys_finit_module+0xbc/0x150
invoke_syscall+0xd4/0x258
el0_svc_common.constprop.0+0xb4/0x240
do_el0_svc+0x48/0x68
el0_svc+0x40/0xf8
el0t_64_sync_handler+0x10c/0x138
el0t_64_sync+0x1ac/0x1b0
This is because the module can only indirectly reference
alloc_tag_counters through the alloc_tag section, which misleads kmemleak.
However, we don't have a kmemleak ignore interface for percpu allocations
yet. So let's create one and invoke it for tag->counters.
[gehao@kylinos.cn: fix build error when CONFIG_DEBUG_KMEMLEAK=n, s/igonore/ignore/]
Link: https://lkml.kernel.org/r/20250620093102.2416767-1-hao.ge@linux.dev
Link: https://lkml.kernel.org/r/20250619183154.2122608-1-hao.ge@linux.dev
Fixes: 12ca42c237 ("alloc_tag: allocate percpu counters for module tags dynamically")
Signed-off-by: Hao Ge <gehao@kylinos.cn>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Suren Baghdasaryan <surenb@google.com> [lib/alloc_tag.c]
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
|
|
/*
|
|
* include/linux/kmemleak.h
|
|
*
|
|
* Copyright (C) 2008 ARM Limited
|
|
* Written by Catalin Marinas <catalin.marinas@arm.com>
|
|
*/
|
|
|
|
#ifndef __KMEMLEAK_H
|
|
#define __KMEMLEAK_H
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/vmalloc.h>
|
|
|
|
#ifdef CONFIG_DEBUG_KMEMLEAK
|
|
|
|
extern void kmemleak_init(void) __init;
|
|
extern void kmemleak_alloc(const void *ptr, size_t size, int min_count,
|
|
gfp_t gfp) __ref;
|
|
extern void kmemleak_alloc_percpu(const void __percpu *ptr, size_t size,
|
|
gfp_t gfp) __ref;
|
|
extern void kmemleak_vmalloc(const struct vm_struct *area, size_t size,
|
|
gfp_t gfp) __ref;
|
|
extern void kmemleak_free(const void *ptr) __ref;
|
|
extern void kmemleak_free_part(const void *ptr, size_t size) __ref;
|
|
extern void kmemleak_free_percpu(const void __percpu *ptr) __ref;
|
|
extern void kmemleak_update_trace(const void *ptr) __ref;
|
|
extern void kmemleak_not_leak(const void *ptr) __ref;
|
|
extern void kmemleak_transient_leak(const void *ptr) __ref;
|
|
extern void kmemleak_ignore(const void *ptr) __ref;
|
|
extern void kmemleak_ignore_percpu(const void __percpu *ptr) __ref;
|
|
extern void kmemleak_scan_area(const void *ptr, size_t size, gfp_t gfp) __ref;
|
|
extern void kmemleak_no_scan(const void *ptr) __ref;
|
|
extern void kmemleak_alloc_phys(phys_addr_t phys, size_t size,
|
|
gfp_t gfp) __ref;
|
|
extern void kmemleak_free_part_phys(phys_addr_t phys, size_t size) __ref;
|
|
extern void kmemleak_ignore_phys(phys_addr_t phys) __ref;
|
|
|
|
static inline void kmemleak_alloc_recursive(const void *ptr, size_t size,
|
|
int min_count, slab_flags_t flags,
|
|
gfp_t gfp)
|
|
{
|
|
if (!(flags & SLAB_NOLEAKTRACE))
|
|
kmemleak_alloc(ptr, size, min_count, gfp);
|
|
}
|
|
|
|
static inline void kmemleak_free_recursive(const void *ptr, slab_flags_t flags)
|
|
{
|
|
if (!(flags & SLAB_NOLEAKTRACE))
|
|
kmemleak_free(ptr);
|
|
}
|
|
|
|
static inline void kmemleak_erase(void **ptr)
|
|
{
|
|
*ptr = NULL;
|
|
}
|
|
|
|
#else
|
|
|
|
static inline void kmemleak_init(void)
|
|
{
|
|
}
|
|
static inline void kmemleak_alloc(const void *ptr, size_t size, int min_count,
|
|
gfp_t gfp)
|
|
{
|
|
}
|
|
static inline void kmemleak_alloc_recursive(const void *ptr, size_t size,
|
|
int min_count, slab_flags_t flags,
|
|
gfp_t gfp)
|
|
{
|
|
}
|
|
static inline void kmemleak_alloc_percpu(const void __percpu *ptr, size_t size,
|
|
gfp_t gfp)
|
|
{
|
|
}
|
|
static inline void kmemleak_vmalloc(const struct vm_struct *area, size_t size,
|
|
gfp_t gfp)
|
|
{
|
|
}
|
|
static inline void kmemleak_free(const void *ptr)
|
|
{
|
|
}
|
|
static inline void kmemleak_free_part(const void *ptr, size_t size)
|
|
{
|
|
}
|
|
static inline void kmemleak_free_recursive(const void *ptr, slab_flags_t flags)
|
|
{
|
|
}
|
|
static inline void kmemleak_free_percpu(const void __percpu *ptr)
|
|
{
|
|
}
|
|
static inline void kmemleak_update_trace(const void *ptr)
|
|
{
|
|
}
|
|
static inline void kmemleak_not_leak(const void *ptr)
|
|
{
|
|
}
|
|
static inline void kmemleak_transient_leak(const void *ptr)
|
|
{
|
|
}
|
|
static inline void kmemleak_ignore_percpu(const void __percpu *ptr)
|
|
{
|
|
}
|
|
static inline void kmemleak_ignore(const void *ptr)
|
|
{
|
|
}
|
|
static inline void kmemleak_scan_area(const void *ptr, size_t size, gfp_t gfp)
|
|
{
|
|
}
|
|
static inline void kmemleak_erase(void **ptr)
|
|
{
|
|
}
|
|
static inline void kmemleak_no_scan(const void *ptr)
|
|
{
|
|
}
|
|
static inline void kmemleak_alloc_phys(phys_addr_t phys, size_t size,
|
|
gfp_t gfp)
|
|
{
|
|
}
|
|
static inline void kmemleak_free_part_phys(phys_addr_t phys, size_t size)
|
|
{
|
|
}
|
|
static inline void kmemleak_ignore_phys(phys_addr_t phys)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_DEBUG_KMEMLEAK */
|
|
|
|
#endif /* __KMEMLEAK_H */
|