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Fri, 25 Oct 2024 01:58:40 -0700 Received: from mtkmbs11n1.mediatek.inc (172.21.101.185) by mtkmbs13n1.mediatek.inc (172.21.101.193) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Fri, 25 Oct 2024 16:58:37 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkmbs11n1.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Fri, 25 Oct 2024 16:58:37 +0800 From: Qun-Wei Lin To: Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , Vlastimil Babka , Roman Gushchin , Hyeonggon Yoo <42.hyeyoo@gmail.com>, Matthias Brugger , AngeloGioacchino Del Regno , Danilo Krummrich CC: , , , , , , , Casper Li , Chinwen Chang , Andrew Yang , John Hsu , , Qun-Wei Lin Subject: [PATCH] mm: krealloc: Fix MTE false alarm in __do_krealloc Date: Fri, 25 Oct 2024 16:58:11 +0800 Message-ID: <20241025085811.31310-1-qun-wei.lin@mediatek.com> X-Mailer: git-send-email 2.18.0 MIME-Version: 1.0 X-MTK: N X-Rspam-User: X-Rspamd-Queue-Id: 6B79C80006 X-Rspamd-Server: rspam01 X-Stat-Signature: gnue6e4q71hy3h7hwrkaiurxb74mk4bm X-HE-Tag: 1729846691-851055 X-HE-Meta: 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 NLDXQxf1 FN2WdqFYZrtA4707RZ6iGNXLPXLN3W3SApkmN/m0SC/i+wzoUF8Rliy2fvjGFvZtou7674eApd4Wbz/I4OIJnqMZkJ2BtzDzwNZ7/xGBpdYygKGOlrYskzxhNWFKs2TOne2m7eqh9U8LltpAmE/S7ahr08IR0lZoVy+Ux+2dt/2oBglyY8Tm3O+DGm7yKkDo1gI9QB3xemNXhCE9BPkdTtv0xl2Y9A72nFB9Rd1sJsCxCBdo5Eb2Uxxfz7lGlpl5Do2KyhSj2jtB3lr6n9Hic1OFKXA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 --- mm/slab_common.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/slab_common.c b/mm/slab_common.c index 3d26c257ed8b..3445f4500b54 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -1209,7 +1209,7 @@ __do_krealloc(const void *p, size_t new_size, gfp_t flags) /* 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((void *)p + new_size), 0, ks - new_size); kasan_enable_current(); }