The quilt patch titled Subject: mm/alloc_tag: fix vm_module_tags_populate's KASAN poisoning logic has been removed from the -mm tree. Its filename was alloc_tag-fix-module-allocation-tags-populated-area-calculation-fix.patch This patch was dropped because it was folded into alloc_tag-fix-module-allocation-tags-populated-area-calculation.patch ------------------------------------------------------ From: Hao Ge <gehao@xxxxxxxxxx> Subject: mm/alloc_tag: fix vm_module_tags_populate's KASAN poisoning logic Date: Fri, 6 Dec 2024 01:05:28 +0800 After commit 233e89322cbe ("alloc_tag: fix module allocation tags populated area calculation"), We still encountered a KASAN bug. This is because we have only actually performed page allocation and address mapping here. we need to unpoisoned portions of underlying memory. Here is the log for KASAN: [ 5.041171][ T1] ================================================================== [ 5.042047][ T1] BUG: KASAN: vmalloc-out-of-bounds in move_module+0x2c0/0x708 [ 5.042723][ T1] Write of size 240 at addr ffff80007e510000 by task systemd/1 [ 5.043412][ T1] [ 5.043523][ T72] input: QEMU QEMU USB Tablet as /devices/pci0000:00/0000:00:01.1/0000:02:001 [ 5.043614][ T1] CPU: 0 UID: 0 PID: 1 Comm: systemd Not tainted 6.13.0-rc1+ #28 [ 5.045560][ T1] Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015 [ 5.046328][ T1] Call trace: [ 5.046670][ T1] show_stack+0x20/0x38 (C) [ 5.047127][ T1] dump_stack_lvl+0x80/0xf8 [ 5.047533][ T1] print_address_description.constprop.0+0x58/0x358 [ 5.048092][ T72] hid-generic 0003:0627:0001.0001: input,hidraw0: USB HID v0.01 Mouse [QEMU 0 [ 5.048126][ T1] print_report+0xb0/0x280 [ 5.049682][ T1] kasan_report+0xb8/0x108 [ 5.050170][ T1] kasan_check_range+0xe8/0x190 [ 5.050685][ T1] memcpy+0x58/0xa0 [ 5.051135][ T1] move_module+0x2c0/0x708 [ 5.051586][ T1] layout_and_allocate.constprop.0+0x308/0x5b8 [ 5.052219][ T1] load_module+0x134/0x16c8 [ 5.052671][ T1] init_module_from_file+0xdc/0x138 [ 5.053193][ T1] idempotent_init_module+0x344/0x600 [ 5.053742][ T1] __arm64_sys_finit_module+0xbc/0x150 [ 5.054289][ T1] invoke_syscall+0xd4/0x258 [ 5.054749][ T1] el0_svc_common.constprop.0+0xb4/0x240 [ 5.055319][ T1] do_el0_svc+0x48/0x68 [ 5.055743][ T1] el0_svc+0x40/0xe0 [ 5.056142][ T1] el0t_64_sync_handler+0x10c/0x138 [ 5.056658][ T1] el0t_64_sync+0x1ac/0x1b0 Link: https://lkml.kernel.org/r/20241205170528.81000-1-hao.ge@xxxxxxxxx Fixes: 233e89322cbe ("alloc_tag: fix module allocation tags populated area calculation") Signed-off-by: Hao Ge <gehao@xxxxxxxxxx> Acked-by: Suren Baghdasaryan <surenb@xxxxxxxxxx> Cc: David Wang <00107082@xxxxxxx> Cc: Kent Overstreet <kent.overstreet@xxxxxxxxx> Cc: Mike Rapoport (Microsoft) <rppt@xxxxxxxxxx> Cc: Pasha Tatashin <pasha.tatashin@xxxxxxxxxx> Cc: Sourav Panda <souravpanda@xxxxxxxxxx> Cc: Yu Zhao <yuzhao@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- lib/alloc_tag.c | 9 +++++++++ 1 file changed, 9 insertions(+) --- a/lib/alloc_tag.c~alloc_tag-fix-module-allocation-tags-populated-area-calculation-fix +++ a/lib/alloc_tag.c @@ -431,6 +431,15 @@ static int vm_module_tags_populate(void) vm_module_tags->nr_pages += nr; } + /* + * Mark the pages as accessible, now that they are mapped. + * With hardware tag-based KASAN, marking is skipped for + * non-VM_ALLOC mappings, see __kasan_unpoison_vmalloc(). + */ + kasan_unpoison_vmalloc((void *)module_tags.start_addr, + new_end - module_tags.start_addr, + KASAN_VMALLOC_PROT_NORMAL); + return 0; } _ Patches currently in -mm which might be from gehao@xxxxxxxxxx are alloc_tag-fix-module-allocation-tags-populated-area-calculation.patch alloc_tag-fix-module-allocation-tags-populated-area-calculation-fix-2.patch