The patch titled
Subject: slub: force on no_hash_pointers when slub_debug is enabled
has been added to the -mm tree. Its filename is
slub-force-on-no_hash_pointers-when-slub_debug-is-enabled.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/slub-force-on-no_hash_pointers-when-slub_debug-is-enabled.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/slub-force-on-no_hash_pointers-when-slub_debug-is-enabled.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Stephen Boyd <swboyd@xxxxxxxxxxxx>
Subject: slub: force on no_hash_pointers when slub_debug is enabled
Obscuring the pointers that slub shows when debugging makes for some
confusing slub debug messages:
Padding overwritten. 0x0000000079f0674a-0x000000000d4dce17
Those addresses are hashed for kernel security reasons. If we're trying
to be secure with slub_debug on the commandline we have some big problems
given that we dump whole chunks of kernel memory to the kernel logs.
Let's force on the no_hash_pointers commandline flag when slub_debug is on
the commandline. This makes slub debug messages more meaningful and if by
chance a kernel address is in some slub debug object dump we will have a
better chance of figuring out what went wrong.
Note that we don't use %px in the slub code because we want to reduce the
number of places that %px is used in the kernel. This also nicely prints
a big fat warning at kernel boot if slub_debug is on the commandline so
that we know that this kernel shouldn't be used on production systems.
Link: https://lkml.kernel.org/r/20210601182202.3011020-5-swboyd@xxxxxxxxxxxx
Signed-off-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Petr Mladek <pmladek@xxxxxxxx>
Cc: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/kernel.h | 2 ++
lib/vsprintf.c | 2 +-
mm/slub.c | 4 ++++
3 files changed, 7 insertions(+), 1 deletion(-)
--- a/include/linux/kernel.h~slub-force-on-no_hash_pointers-when-slub_debug-is-enabled
+++ a/include/linux/kernel.h
@@ -357,6 +357,8 @@ int sscanf(const char *, const char *, .
extern __scanf(2, 0)
int vsscanf(const char *, const char *, va_list);
+extern int no_hash_pointers_enable(char *str);
+
extern int get_option(char **str, int *pint);
extern char *get_options(const char *str, int nints, int *ints);
extern unsigned long long memparse(const char *ptr, char **retptr);
--- a/lib/vsprintf.c~slub-force-on-no_hash_pointers-when-slub_debug-is-enabled
+++ a/lib/vsprintf.c
@@ -2186,7 +2186,7 @@ char *fwnode_string(char *buf, char *end
bool no_hash_pointers __ro_after_init;
EXPORT_SYMBOL_GPL(no_hash_pointers);
-static int __init no_hash_pointers_enable(char *str)
+int __init no_hash_pointers_enable(char *str)
{
if (no_hash_pointers)
return 0;
--- a/mm/slub.c~slub-force-on-no_hash_pointers-when-slub_debug-is-enabled
+++ a/mm/slub.c
@@ -4492,6 +4492,10 @@ void __init kmem_cache_init(void)
if (debug_guardpage_minorder())
slub_max_order = 0;
+ /* Print slub debugging pointers without hashing */
+ if (static_branch_unlikely(&slub_debug_enabled))
+ no_hash_pointers_enable(NULL);
+
kmem_cache_node = &boot_kmem_cache_node;
kmem_cache = &boot_kmem_cache;
_
Patches currently in -mm which might be from swboyd@xxxxxxxxxxxx are
slub-restore-slub_debug=-behavior.patch
slub-actually-use-message-in-restore_bytes.patch
slub-force-on-no_hash_pointers-when-slub_debug-is-enabled.patch
buildid-only-consider-gnu-notes-for-build-id-parsing.patch
buildid-add-api-to-parse-build-id-out-of-buffer.patch
buildid-stash-away-kernels-build-id-on-init.patch
buildid-stash-away-kernels-build-id-on-init-fix.patch
dump_stack-add-vmlinux-build-id-to-stack-traces.patch
module-add-printk-formats-to-add-module-build-id-to-stacktraces.patch
arm64-stacktrace-use-%psb-for-backtrace-printing.patch
x86-dumpstack-use-%psb-%pbb-for-backtrace-printing.patch
scripts-decode_stacktracesh-support-debuginfod.patch
scripts-decode_stacktracesh-silence-stderr-messages-from-addr2line-nm.patch
scripts-decode_stacktracesh-indicate-auto-can-be-used-for-base-path.patch
buildid-mark-some-arguments-const.patch
buildid-fix-kernel-doc-notation.patch
kdump-use-vmlinux_build_id-to-simplify.patch
