linux-kernel - [PATCH] mm/alloc_tag: fix vm_module_tags

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Message-Id: <20241204075248.384215-1-hao.ge@linux.dev>
Date: Wed,  4 Dec 2024 15:52:48 +0800
From: Hao Ge <hao.ge@...ux.dev>
To: surenb@...gle.com,
	kent.overstreet@...ux.dev,
	akpm@...ux-foundation.org
Cc: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	hao.ge@...ux.dev,
	Hao Ge <gehao@...inos.cn>
Subject: [PATCH] mm/alloc_tag: fix vm_module_tags_populate's KASAN poisoning logic

From: Hao Ge <gehao@...inos.cn>

After merge commit 233e89322cbe ("alloc_tag:
fix module allocation tags populated area calculation"),
We still encountered a KASAN bug.

This is because we have only actually performed
page allocation and address mapping here.
we need to unpoisoned portions of underlying memory.

Because we have a change in the size here,we need to
re-annotate poisoned and unpoisoned portions of underlying memory
according to the new size.

Here is the log for KASAN:

[    5.041171][    T1] ==================================================================
[    5.042047][    T1] BUG: KASAN: vmalloc-out-of-bounds in move_module+0x2c0/0x708
[    5.042723][    T1] Write of size 240 at addr ffff80007e510000 by task systemd/1
[    5.043412][    T1]
[    5.043523][   T72] input: QEMU QEMU USB Tablet as /devices/pci0000:00/0000:00:01.1/0000:02:001
[    5.043614][    T1] CPU: 0 UID: 0 PID: 1 Comm: systemd Not tainted 6.13.0-rc1+ #28
[    5.045560][    T1] Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015
[    5.046328][    T1] Call trace:
[    5.046670][    T1]  show_stack+0x20/0x38 (C)
[    5.047127][    T1]  dump_stack_lvl+0x80/0xf8
[    5.047533][    T1]  print_address_description.constprop.0+0x58/0x358
[    5.048092][   T72] hid-generic 0003:0627:0001.0001: input,hidraw0: USB HID v0.01 Mouse [QEMU 0
[    5.048126][    T1]  print_report+0xb0/0x280
[    5.049682][    T1]  kasan_report+0xb8/0x108
[    5.050170][    T1]  kasan_check_range+0xe8/0x190
[    5.050685][    T1]  memcpy+0x58/0xa0
[    5.051135][    T1]  move_module+0x2c0/0x708
[    5.051586][    T1]  layout_and_allocate.constprop.0+0x308/0x5b8
[    5.052219][    T1]  load_module+0x134/0x16c8
[    5.052671][    T1]  init_module_from_file+0xdc/0x138
[    5.053193][    T1]  idempotent_init_module+0x344/0x600
[    5.053742][    T1]  __arm64_sys_finit_module+0xbc/0x150
[    5.054289][    T1]  invoke_syscall+0xd4/0x258
[    5.054749][    T1]  el0_svc_common.constprop.0+0xb4/0x240
[    5.055319][    T1]  do_el0_svc+0x48/0x68
[    5.055743][    T1]  el0_svc+0x40/0xe0
[    5.056142][    T1]  el0t_64_sync_handler+0x10c/0x138
[    5.056658][    T1]  el0t_64_sync+0x1ac/0x1b0

Fixes: 233e89322cbe ("alloc_tag: fix module allocation tags populated area calculation")
Signed-off-by: Hao Ge <gehao@...inos.cn>

---
commit 233e89322cbe ("alloc_tag: fix module allocation
tags populated area calculation") is currently in the
mm-hotfixes-unstable branch, so this patch is
developed based on the mm-hotfixes-unstable branch.
---
 lib/alloc_tag.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/lib/alloc_tag.c b/lib/alloc_tag.c
index 4ee6caa6d2da..ad31acb1279a 100644
--- a/lib/alloc_tag.c
+++ b/lib/alloc_tag.c
@@ -421,7 +421,15 @@ static int vm_module_tags_populate(void)
 				__free_page(next_page[i]);
 			return -ENOMEM;
 		}
+
+		kasan_poison_vmalloc((void *)module_tags.start_addr,
+				     vm_module_tags->nr_pages << PAGE_SHIFT);
+
 		vm_module_tags->nr_pages += nr;
+
+		kasan_unpoison_vmalloc((void *)module_tags.start_addr,
+				       vm_module_tags->nr_pages << PAGE_SHIFT,
+				       KASAN_VMALLOC_PROT_NORMAL);
 	}
 
 	return 0;
-- 
2.25.1