mm/alloc_tag: fix the kmemleak false positive issue in the allocation of the percpu variable tag->counters

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: 12ca42c23775 ("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>

1 files changed, 7 insertions, 1 deletions

diff --git a/lib/alloc_tag.c b/lib/alloc_tag.c
index d48b80f3f007..3a74d63a959e 100644
--- a/lib/alloc_tag.c
+++ b/lib/alloc_tag.c
@@ -10,6 +10,7 @@
 #include <linux/seq_buf.h>
 #include <linux/seq_file.h>
 #include <linux/vmalloc.h>
+#include <linux/kmemleak.h>
 
 #define ALLOCINFO_FILE_NAME		"allocinfo"
 #define MODULE_ALLOC_TAG_VMAP_SIZE	(100000UL * sizeof(struct alloc_tag))
@@ -632,8 +633,13 @@ static int load_module(struct module *mod, struct codetag *start, struct codetag
 			       mod->name);
 			return -ENOMEM;
 		}
-	}
 
+		/*
+		 * Avoid a kmemleak false positive. The pointer to the counters is stored
+		 * in the alloc_tag section of the module and cannot be directly accessed.
+		 */
+		kmemleak_ignore_percpu(tag->counters);
+	}
 	return 0;
 }