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dbe245cdf5
The iter internally holds a pointer to the area and
iopt_area_contig_done() will dereference it. The pointer is not valid
outside the iova_rwsem.
syzkaller reports:
BUG: KASAN: slab-use-after-free in iommufd_access_unpin_pages+0x363/0x370
Read of size 8 at addr ffff888022286e20 by task syz-executor669/5771
CPU: 0 PID: 5771 Comm: syz-executor669 Not tainted 6.4.0-rc5-syzkaller-00313-g4c605260bc60 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023
Call Trace:
<TASK>
dump_stack_lvl+0xd9/0x150
print_address_description.constprop.0+0x2c/0x3c0
kasan_report+0x11c/0x130
iommufd_access_unpin_pages+0x363/0x370
iommufd_test_access_unmap+0x24b/0x390
iommufd_access_notify_unmap+0x24c/0x3a0
iopt_unmap_iova_range+0x4c4/0x5f0
iopt_unmap_all+0x27/0x50
iommufd_ioas_unmap+0x3d0/0x490
iommufd_fops_ioctl+0x317/0x4b0
__x64_sys_ioctl+0x197/0x210
do_syscall_64+0x39/0xb0
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fec1dae3b19
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fec1da74308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fec1db6b438 RCX: 00007fec1dae3b19
RDX: 0000000020000100 RSI: 0000000000003b86 RDI: 0000000000000003
RBP: 00007fec1db6b430 R08: 00007fec1da74700 R09: 0000000000000000
R10: 00007fec1da74700 R11: 0000000000000246 R12: 00007fec1db6b43c
R13: 00007fec1db39074 R14: 6d6f692f7665642f R15: 0000000000022000
</TASK>
Allocated by task 5770:
kasan_save_stack+0x22/0x40
kasan_set_track+0x25/0x30
__kasan_kmalloc+0xa2/0xb0
iopt_alloc_area_pages+0x94/0x560
iopt_map_user_pages+0x205/0x4e0
iommufd_ioas_map+0x329/0x5f0
iommufd_fops_ioctl+0x317/0x4b0
__x64_sys_ioctl+0x197/0x210
do_syscall_64+0x39/0xb0
entry_SYSCALL_64_after_hwframe+0x63/0xcd
Freed by task 5770:
kasan_save_stack+0x22/0x40
kasan_set_track+0x25/0x30
kasan_save_free_info+0x2e/0x40
____kasan_slab_free+0x160/0x1c0
slab_free_freelist_hook+0x8b/0x1c0
__kmem_cache_free+0xaf/0x2d0
iopt_unmap_iova_range+0x288/0x5f0
iopt_unmap_all+0x27/0x50
iommufd_ioas_unmap+0x3d0/0x490
iommufd_fops_ioctl+0x317/0x4b0
__x64_sys_ioctl+0x197/0x210
do_syscall_64+0x39/0xb0
entry_SYSCALL_64_after_hwframe+0x63/0xcd
The parallel unmap free'd iter->area the instant the lock was released.
Fixes:
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