iommufd: Protect against overflow of ALIGN() during iova allocation

In the Linux kernel, the following vulnerability has been resolved:

iommufd: Protect against overflow of ALIGN() during iova allocation

Userspace can supply an iova and uptr such that the target iova alignment

becomes really big and ALIGN() overflows which corrupts the selected area

range during allocation. CONFIG_IOMMUFD_TEST can detect this:

WARNING: CPU: 1 PID: 5092 at drivers/iommu/iommufd/io_pagetable.c:268 iopt_alloc_area_pages drivers/iommu/iommufd/io_pagetable.c:268 [inline]

WARNING: CPU: 1 PID: 5092 at drivers/iommu/iommufd/io_pagetable.c:268 iopt_map_pages+0xf95/0x1050 drivers/iommu/iommufd/io_pagetable.c:352

Modules linked in:

CPU: 1 PID: 5092 Comm: syz-executor294 Not tainted 6.10.0-rc5-syzkaller-00294-g3ffea9a7a6f7 #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024

RIP: 0010:iopt_alloc_area_pages drivers/iommu/iommufd/io_pagetable.c:268 [inline]

RIP: 0010:iopt_map_pages+0xf95/0x1050 drivers/iommu/iommufd/io_pagetable.c:352

Code: fc e9 a4 f3 ff ff e8 1a 8b 4c fc 41 be e4 ff ff ff e9 8a f3 ff ff e8 0a 8b 4c fc 90 0f 0b 90 e9 37 f5 ff ff e8 fc 8a 4c fc 90 <0f> 0b 90 e9 68 f3 ff ff 48 c7 c1 ec 82 ad 8f 80 e1 07 80 c1 03 38

RSP: 0018:ffffc90003ebf9e0 EFLAGS: 00010293

RAX: ffffffff85499fa4 RBX: 00000000ffffffef RCX: ffff888079b49e00

RDX: 0000000000000000 RSI: 00000000ffffffef RDI: 0000000000000000

RBP: ffffc90003ebfc50 R08: ffffffff85499b30 R09: ffffffff85499942

R10: 0000000000000002 R11: ffff888079b49e00 R12: ffff8880228e0010

R13: 0000000000000000 R14: 1ffff920007d7f68 R15: ffffc90003ebfd00

FS: 000055557d760380(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00000000005fdeb8 CR3: 000000007404a000 CR4: 00000000003506f0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Call Trace:

<TASK>

iommufd_ioas_copy+0x610/0x7b0 drivers/iommu/iommufd/ioas.c:274

iommufd_fops_ioctl+0x4d9/0x5a0 drivers/iommu/iommufd/main.c:421

vfs_ioctl fs/ioctl.c:51 [inline]

__do_sys_ioctl fs/ioctl.c:907 [inline]

__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893

do_syscall_x64 arch/x86/entry/common.c:52 [inline]

do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83

entry_SYSCALL_64_after_hwframe+0x77/0x7f

Cap the automatic alignment to the huge page size, which is probably a

better idea overall. Huge automatic alignments can fragment and chew up

the available IOVA space without any reason.