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15fdc79c59
As of now during link list corruption it prints about cluprit address and its wrong value, but sometime it is not enough to catch the actual issue point. If it prints allocation and free path of that corrupted node, it will be a lot easier to find and fix the issues. Adding the same information when data mismatch is found in link list debug data: [ 14.243055] slab kmalloc-32 start ffff0000cda19320 data offset 32 pointer offset 8 size 32 allocated at add_to_list+0x28/0xb0 [ 14.245259] __kmalloc_cache_noprof+0x1c4/0x358 [ 14.245572] add_to_list+0x28/0xb0 ... [ 14.248632] do_el0_svc_compat+0x1c/0x34 [ 14.249018] el0_svc_compat+0x2c/0x80 [ 14.249244] Free path: [ 14.249410] kfree+0x24c/0x2f0 [ 14.249724] do_force_corruption+0xbc/0x100 ... [ 14.252266] el0_svc_common.constprop.0+0x40/0xe0 [ 14.252540] do_el0_svc_compat+0x1c/0x34 [ 14.252763] el0_svc_compat+0x2c/0x80 [ 14.253071] ------------[ cut here ]------------ [ 14.253303] list_del corruption. next->prev should be ffff0000cda192a8, but was 6b6b6b6b6b6b6b6b. (next=ffff0000cda19348) [ 14.254255] WARNING: CPU: 3 PID: 84 at lib/list_debug.c:65 __list_del_entry_valid_or_report+0x158/0x164 Moved prototype of mem_dump_obj() to bug.h, as mm.h can not be included in bug.h. Link: https://lkml.kernel.org/r/20241230101043.53773-1-maninder1.s@samsung.com Signed-off-by: Maninder Singh <maninder1.s@samsung.com> Acked-by: Jan Kara <jack@suse.cz> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Christian Brauner <brauner@kernel.org> Cc: Marco Elver <elver@google.com> Cc: Rohit Thapliyal <r.thapliyal@samsung.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
73 lines
2.4 KiB
C
73 lines
2.4 KiB
C
/*
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* Copyright 2006, Red Hat, Inc., Dave Jones
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* Released under the General Public License (GPL).
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*
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* This file contains the linked list validation and error reporting for
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* LIST_HARDENED and DEBUG_LIST.
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*/
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#include <linux/export.h>
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#include <linux/list.h>
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#include <linux/bug.h>
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#include <linux/kernel.h>
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#include <linux/rculist.h>
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/*
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* Check that the data structures for the list manipulations are reasonably
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* valid. Failures here indicate memory corruption (and possibly an exploit
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* attempt).
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*/
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__list_valid_slowpath
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bool __list_add_valid_or_report(struct list_head *new, struct list_head *prev,
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struct list_head *next)
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{
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if (CHECK_DATA_CORRUPTION(prev == NULL, NULL,
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"list_add corruption. prev is NULL.\n") ||
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CHECK_DATA_CORRUPTION(next == NULL, NULL,
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"list_add corruption. next is NULL.\n") ||
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CHECK_DATA_CORRUPTION(next->prev != prev, next,
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"list_add corruption. next->prev should be prev (%px), but was %px. (next=%px).\n",
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prev, next->prev, next) ||
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CHECK_DATA_CORRUPTION(prev->next != next, prev,
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"list_add corruption. prev->next should be next (%px), but was %px. (prev=%px).\n",
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next, prev->next, prev) ||
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CHECK_DATA_CORRUPTION(new == prev || new == next, NULL,
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"list_add double add: new=%px, prev=%px, next=%px.\n",
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new, prev, next))
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return false;
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return true;
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}
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EXPORT_SYMBOL(__list_add_valid_or_report);
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__list_valid_slowpath
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bool __list_del_entry_valid_or_report(struct list_head *entry)
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{
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struct list_head *prev, *next;
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prev = entry->prev;
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next = entry->next;
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if (CHECK_DATA_CORRUPTION(next == NULL, NULL,
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"list_del corruption, %px->next is NULL\n", entry) ||
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CHECK_DATA_CORRUPTION(prev == NULL, NULL,
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"list_del corruption, %px->prev is NULL\n", entry) ||
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CHECK_DATA_CORRUPTION(next == LIST_POISON1, next,
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"list_del corruption, %px->next is LIST_POISON1 (%px)\n",
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entry, LIST_POISON1) ||
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CHECK_DATA_CORRUPTION(prev == LIST_POISON2, prev,
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"list_del corruption, %px->prev is LIST_POISON2 (%px)\n",
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entry, LIST_POISON2) ||
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CHECK_DATA_CORRUPTION(prev->next != entry, prev,
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"list_del corruption. prev->next should be %px, but was %px. (prev=%px)\n",
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entry, prev->next, prev) ||
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CHECK_DATA_CORRUPTION(next->prev != entry, next,
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"list_del corruption. next->prev should be %px, but was %px. (next=%px)\n",
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entry, next->prev, next))
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return false;
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return true;
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}
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EXPORT_SYMBOL(__list_del_entry_valid_or_report);
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