On 9/22/21 23:45, Leon Romanovsky wrote:
Isn't kptr_restrict sysctl is for that?
Hi Leon,
After I sent my email I discovered the following commit: 5ead723a20e0
("lib/vsprintf: no_hash_pointers prints all addresses as unhashed"; v5.12).
I think that commit does what we need?
Thanks,
Bart.
commit 5ead723a20e0447bc7db33dc3070b420e5f80aa6
Author: Timur Tabi <timur@xxxxxxxxxx>
Date: Sun Feb 14 10:13:48 2021 -0600
lib/vsprintf: no_hash_pointers prints all addresses as unhashed
If the no_hash_pointers command line parameter is set, then
printk("%p") will print pointers as unhashed, which is useful for
debugging purposes. This change applies to any function that uses
vsprintf, such as print_hex_dump() and seq_buf_printf().
A large warning message is displayed if this option is enabled.
Unhashed pointers expose kernel addresses, which can be a security
risk.
Also update test_printf to skip the hashed pointer tests if the
command-line option is set.
Signed-off-by: Timur Tabi <timur@xxxxxxxxxx>
Acked-by: Petr Mladek <pmladek@xxxxxxxx>
Acked-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Acked-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
Acked-by: Marco Elver <elver@xxxxxxxxxx>
Signed-off-by: Petr Mladek <pmladek@xxxxxxxx>
Link: https://lore.kernel.org/r/20210214161348.369023-4-timur@xxxxxxxxxx
