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lib/list_debug.c: print unmangled addresses 

The entire point of printing the pointers in list_debug is to see if
there's any useful information in them (eg poison values, ASCII, etc);
obscuring them to see if they compare equal makes them much less useful.
If an attacker can force this message to be printed, we've already lost.

Link: http://lkml.kernel.org/r/20180401223237.GV13332@bombadil.infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Reviewed-by: Tobin C. Harding <me@tobin.cc>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Eric Biggers <ebiggers3@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matthew Wilcox 2018-04-10 16:33:06 -07:00 committed by Linus Torvalds
parent 3175060092
commit 68c1f08203
1 changed files with 7 additions and 7 deletions
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14
lib/list_debug.c
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@ -21,13 +21,13 @@ bool __list_add_valid(struct list_head *new, struct list_head *prev,
struct list_head *next) struct list_head *next)
{ {
if (CHECK_DATA_CORRUPTION(next->prev != prev, if (CHECK_DATA_CORRUPTION(next->prev != prev,
"list_add corruption. next->prev should be prev (%p), but was %p. (next=%p).\n", "list_add corruption. next->prev should be prev (%px), but was %px. (next=%px).\n",
prev, next->prev, next) || prev, next->prev, next) ||
CHECK_DATA_CORRUPTION(prev->next != next, CHECK_DATA_CORRUPTION(prev->next != next,
"list_add corruption. prev->next should be next (%p), but was %p. (prev=%p).\n", "list_add corruption. prev->next should be next (%px), but was %px. (prev=%px).\n",
next, prev->next, prev) || next, prev->next, prev) ||
CHECK_DATA_CORRUPTION(new == prev || new == next, CHECK_DATA_CORRUPTION(new == prev || new == next,
"list_add double add: new=%p, prev=%p, next=%p.\n", "list_add double add: new=%px, prev=%px, next=%px.\n",
new, prev, next)) new, prev, next))
return false; return false;
@ -43,16 +43,16 @@ bool __list_del_entry_valid(struct list_head *entry)
next = entry->next; next = entry->next;
if (CHECK_DATA_CORRUPTION(next == LIST_POISON1, if (CHECK_DATA_CORRUPTION(next == LIST_POISON1,
"list_del corruption, %p->next is LIST_POISON1 (%p)\n", "list_del corruption, %px->next is LIST_POISON1 (%px)\n",
entry, LIST_POISON1) || entry, LIST_POISON1) ||
CHECK_DATA_CORRUPTION(prev == LIST_POISON2, CHECK_DATA_CORRUPTION(prev == LIST_POISON2,
"list_del corruption, %p->prev is LIST_POISON2 (%p)\n", "list_del corruption, %px->prev is LIST_POISON2 (%px)\n",
entry, LIST_POISON2) || entry, LIST_POISON2) ||
CHECK_DATA_CORRUPTION(prev->next != entry, CHECK_DATA_CORRUPTION(prev->next != entry,
"list_del corruption. prev->next should be %p, but was %p\n", "list_del corruption. prev->next should be %px, but was %px\n",
entry, prev->next) || entry, prev->next) ||
CHECK_DATA_CORRUPTION(next->prev != entry, CHECK_DATA_CORRUPTION(next->prev != entry,
"list_del corruption. next->prev should be %p, but was %p\n", "list_del corruption. next->prev should be %px, but was %px\n",
entry, next->prev)) entry, next->prev))
return false; return false;