6.11-stable patches

added patches:
	mm-krealloc-fix-mte-false-alarm-in-__do_krealloc.patch

diff --git a/queue-6.11/mm-krealloc-fix-mte-false-alarm-in-__do_krealloc.patch b/queue-6.11/mm-krealloc-fix-mte-false-alarm-in-__do_krealloc.patch
new file mode 100644 (file)
index 0000000..3aea943
--- /dev/null
+++ b/queue-6.11/mm-krealloc-fix-mte-false-alarm-in-__do_krealloc.patch
@@ -0,0 +1,75 @@
+From 704573851b51808b45dae2d62059d1d8189138a2 Mon Sep 17 00:00:00 2001
+From: Qun-Wei Lin <qun-wei.lin@mediatek.com>
+Date: Fri, 25 Oct 2024 16:58:11 +0800
+Subject: mm: krealloc: Fix MTE false alarm in __do_krealloc
+
+From: Qun-Wei Lin <qun-wei.lin@mediatek.com>
+
+commit 704573851b51808b45dae2d62059d1d8189138a2 upstream.
+
+This patch addresses an issue introduced by commit 1a83a716ec233 ("mm:
+krealloc: consider spare memory for __GFP_ZERO") which causes MTE
+(Memory Tagging Extension) to falsely report a slab-out-of-bounds error.
+
+The problem occurs when zeroing out spare memory in __do_krealloc. The
+original code only considered software-based KASAN and did not account
+for MTE. It does not reset the KASAN tag before calling memset, leading
+to a mismatch between the pointer tag and the memory tag, resulting
+in a false positive.
+
+Example of the error:
+==================================================================
+swapper/0: BUG: KASAN: slab-out-of-bounds in __memset+0x84/0x188
+swapper/0: Write at addr f4ffff8005f0fdf0 by task swapper/0/1
+swapper/0: Pointer tag: [f4], memory tag: [fe]
+swapper/0:
+swapper/0: CPU: 4 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.
+swapper/0: Hardware name: MT6991(ENG) (DT)
+swapper/0: Call trace:
+swapper/0:  dump_backtrace+0xfc/0x17c
+swapper/0:  show_stack+0x18/0x28
+swapper/0:  dump_stack_lvl+0x40/0xa0
+swapper/0:  print_report+0x1b8/0x71c
+swapper/0:  kasan_report+0xec/0x14c
+swapper/0:  __do_kernel_fault+0x60/0x29c
+swapper/0:  do_bad_area+0x30/0xdc
+swapper/0:  do_tag_check_fault+0x20/0x34
+swapper/0:  do_mem_abort+0x58/0x104
+swapper/0:  el1_abort+0x3c/0x5c
+swapper/0:  el1h_64_sync_handler+0x80/0xcc
+swapper/0:  el1h_64_sync+0x68/0x6c
+swapper/0:  __memset+0x84/0x188
+swapper/0:  btf_populate_kfunc_set+0x280/0x3d8
+swapper/0:  __register_btf_kfunc_id_set+0x43c/0x468
+swapper/0:  register_btf_kfunc_id_set+0x48/0x60
+swapper/0:  register_nf_nat_bpf+0x1c/0x40
+swapper/0:  nf_nat_init+0xc0/0x128
+swapper/0:  do_one_initcall+0x184/0x464
+swapper/0:  do_initcall_level+0xdc/0x1b0
+swapper/0:  do_initcalls+0x70/0xc0
+swapper/0:  do_basic_setup+0x1c/0x28
+swapper/0:  kernel_init_freeable+0x144/0x1b8
+swapper/0:  kernel_init+0x20/0x1a8
+swapper/0:  ret_from_fork+0x10/0x20
+==================================================================
+
+Fixes: 1a83a716ec233 ("mm: krealloc: consider spare memory for __GFP_ZERO")
+Signed-off-by: Qun-Wei Lin <qun-wei.lin@mediatek.com>
+Acked-by: David Rientjes <rientjes@google.com>
+Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ mm/slab_common.c |    2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/mm/slab_common.c
++++ b/mm/slab_common.c
+@@ -1285,7 +1285,7 @@ __do_krealloc(const void *p, size_t new_
+               /* Zero out spare memory. */
+               if (want_init_on_alloc(flags)) {
+                       kasan_disable_current();
+-                      memset((void *)p + new_size, 0, ks - new_size);
++                      memset(kasan_reset_tag(p) + new_size, 0, ks - new_size);
+                       kasan_enable_current();
+               }
+ 

diff --git a/queue-6.11/series b/queue-6.11/series
index 223f58d64044c20877c7022fe448e8d0204d2588..658f18a96a7a7cb5db568f72eeaca2a8ddcfc2b8 100644 (file)
--- a/queue-6.11/series
+++ b/queue-6.11/series
@@ -59,3 +59,4 @@ drm-xe-guc-ct-flush-g2h-worker-in-case-of-g2h-respon.patch
 drm-xe-handle-unreliable-mmio-reads-during-forcewake.patch
 drm-xe-ufence-prefetch-ufence-addr-to-catch-bogus-ad.patch
 drm-xe-don-t-restart-parallel-queues-multiple-times-.patch
+mm-krealloc-fix-mte-false-alarm-in-__do_krealloc.patch