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charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Exchange-RoutingPolicyChecked: odADnJsHt2//CB5UVo50q17VBZ4KqQLPVgPSgZBD8bGlqBWt8Iesnd438IxsraxX2Nb5X75PncNoophxDa00TlCFgIy/DzqdJDKmkz2W4IgcW3L6sRsI9hVgvCgo9phPP2euQP1FGbCmlYKTWtFkZID6X7kjl5032j5H6PzOoXZCrGXFzGH0CXKm2/XaNz+4ikpJqXN/PGWevHlX0vSEkG70YR/b6joPsaGZMHCRt1uYRYuvbc1zY+/R5kvt5MbSezH2Mrh7suqWrAlTTyMlMWnzE9h3w5aYmHJgxaJsp2vJkdfaRWIHNKzgr0qQHHBAW7v6V4r8jMItRTmdSpGcnA== X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: IA0PR11MB7185.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: d300d646-c76e-48db-df72-08df1868d8a1 X-MS-Exchange-CrossTenant-originalarrivaltime: 22 Sep 2026 05:17:49.9828 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: iUCI3zry3ed3sLcwhVbJwL9Pu8ovhB3OfGVaQi/ynUzk9IhSlu9a7Yzx8ecdEaZgJb8Ec9TVQO1OkUnFmJ403qmDx1qJq+mccYEaU62GzsA= X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR11MB8302 X-OriginatorOrg: intel.com Hi Christian, > Subject: Re: [PATCH v2] dma-buf/udmabuf: reinstate a reasonable > default size limit >=20 > On 9/19/26 02:42, Jiakai Xu wrote: > > Commit 44e9eb5a7621 ("dma-buf/udmabuf: Disable the size limit by > > default") raised the default size_limit_mb from 64 to INT_MAX. With > > 4K pages, creating a buffer of more than INT_MAX / 8 pages (about 1 > TB > > of pinned memory) now makes the two per-page pointer arrays in > > init_udmabuf() exceed what kvmalloc() can handle: kvmalloc() warns > and > > fails when the requested size exceeds INT_MAX bytes > (WARN_ON_ONCE in > > __kvmalloc_node_noprof), which is trivially triggerable from > > unprivileged users through the UDMABUF_CREATE ioctls: > > > > WARNING: CPU: 0 PID: 412 at mm/slub.c:7021 > __kvmalloc_node_noprof > > Call Trace: > > udmabuf_create > > udmabuf_ioctl_create_list > > > > Restore a reasonable default limit of 256 MB, which is the value > > proposed in the RFC discussion that led to commit 44e9eb5a7621 >=20 > That is way to low, we want to allocate multiple gigabytes using that > API. I am wondering, what is the use-case that would require pinning multiple Gigabytes of memory via udmabuf? Thanks, Vivek >=20 > Please make that (((INT_MAX / sizeof(struct folio *)) - 1) >> 20) << > PAGE_SHIFT. >=20 > That should allow to allocate a bit below 1TiB again without triggering > the issue. >=20 > Regards, > Christian. >=20 > > ("dma-buf/udmabuf: Disable the size limit by default") and > comfortably > > covers the 8K video use cases cited there, while keeping the > > kvmalloc() request far below its threshold. The limit remains > > runtime-tunable via the size_limit_mb module parameter for setups > > that need more. > > > > Fixes: 44e9eb5a7621 ("dma-buf/udmabuf: Disable the size limit by > default") > > Assisted-by: OpenCode:DeepSeek-V4-Flash > > Signed-off-by: Jiakai Xu > > --- > > V1 -> V2: > > - Instead of adding a pgcnt check in udmabuf_create(), restore a > > reasonable default size limit (256 MB), as suggested by Christian > > K=F6nig. > > - Drop the second Fixes tag; the regression is solely due to > > 44e9eb5a7621. > > - Drop the "Cc: stable" tag; 44e9eb5a7621 is only in v7.3-rc1 and has > > not shipped in any released kernel yet. > > > > V1: https://lore.kernel.org/all/20260918013434.1849135-1- > xujiakai24@mails.ucas.ac.cn/ > > --- > > drivers/dma-buf/udmabuf.c | 4 ++-- > > 1 file changed, 2 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c > > index df6dd00462423..4d90c2cb14225 100644 > > --- a/drivers/dma-buf/udmabuf.c > > +++ b/drivers/dma-buf/udmabuf.c > > @@ -20,9 +20,9 @@ static int list_limit =3D 1024; > > module_param(list_limit, int, 0644); > > MODULE_PARM_DESC(list_limit, "udmabuf_create_list->count limit. > Default is 1024."); > > > > -static int size_limit_mb =3D INT_MAX; > > +static int size_limit_mb =3D 256; > > module_param(size_limit_mb, int, 0644); > > -MODULE_PARM_DESC(size_limit_mb, "Max size of a dmabuf, in > megabytes. Default is INT_MAX."); > > +MODULE_PARM_DESC(size_limit_mb, "Max size of a dmabuf, in > megabytes. Default is 256."); > > > > struct udmabuf { > > pgoff_t pagecount; > > -- > > 2.34.1 > > > > -- > > Below is the crash report: > > ------------[ cut here ]------------ > > WARNING: mm/slub.c:7013 at __kvmalloc_node_noprof+0x516/0x5d0 > home/zzzrrll/tmp/kf_src/linux-7.3-rc2/mm/slub.c:7013, CPU#0: > syz.5.27938/167363 > > Modules linked in: > > CPU: 0 UID: 0 PID: 167363 Comm: syz.5.27938 Tainted: G W L > 7.3.0-rc2 #1 PREEMPT(full) > > Tainted: [W]=3DWARN, [L]=3DSOFTLOCKUP > > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0- > 1 04/01/2014 > > RIP: 0010:__kvmalloc_node_noprof+0x516/0x5d0 > home/zzzrrll/tmp/kf_src/linux-7.3-rc2/mm/slub.c:7013 > > Code: 05 bf fa 2d 08 49 8b 0f c6 04 08 00 65 48 ff 0d 90 fa 2d 08 0f 85 > 4c fd ff ff e8 05 43 8c ff e9 42 fd ff ff e8 9b 86 0e 04 90 <0f> 0b 90 31= db > e9 d2 fe ff ff f3 0f 1e fa 65 8b 05 8d fa 2d 08 89 > > RSP: 0018:ffffc90002bc3cf8 EFLAGS: 00010246 > > RAX: 0000000000000100 RBX: 0000000000000000 RCX: > 0000008000000000 > > RDX: 0000008000000000 RSI: 0000000000000000 RDI: ffffffff835e3226 > > RBP: 00000000ffffffff R08: 00000000000028c0 R09: 00000000ffffffff > > R10: 0000000000000006 R11: 0000000000000002 R12: > 0000008000000000 > > R13: 00000000000028c0 R14: 0000001000000000 R15: > 0000008000000000 > > FS: 00007fc89ae45640(0000) GS:ffff8880f3de4000(0000) > knlGS:0000000000000000 > > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > > CR2: 000000110c2ff305 CR3: 000000002b3d4000 CR4: > 0000000000752ef0 > > DR0: 0000000000000000 DR1: 0000000000000000 DR2: > 0000000000006000 > > DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: > 0000000000000400 > > PKRU: 80000000 > > Call Trace: > > > > init_udmabuf home/zzzrrll/tmp/kf_src/linux-7.3-rc2/drivers/dma- > buf/udmabuf.c:193 [inline] > > udmabuf_create+0x1b6/0x750 home/zzzrrll/tmp/kf_src/linux-7.3- > rc2/drivers/dma-buf/udmabuf.c:386 > > udmabuf_ioctl_create home/zzzrrll/tmp/kf_src/linux-7.3- > rc2/drivers/dma-buf/udmabuf.c:465 [inline] > > udmabuf_ioctl+0x132/0x1d0 home/zzzrrll/tmp/kf_src/linux-7.3- > rc2/drivers/dma-buf/udmabuf.c:496 > > vfs_ioctl home/zzzrrll/tmp/kf_src/linux-7.3-rc2/fs/ioctl.c:51 [inline] > > __do_sys_ioctl home/zzzrrll/tmp/kf_src/linux-7.3-rc2/fs/ioctl.c:597 > [inline] > > __se_sys_ioctl+0xbc/0x130 home/zzzrrll/tmp/kf_src/linux-7.3- > rc2/fs/ioctl.c:583 > > do_syscall_x64 home/zzzrrll/tmp/kf_src/linux-7.3- > rc2/arch/x86/entry/syscall_64.c:61 [inline] > > do_syscall_64+0x12b/0x350 home/zzzrrll/tmp/kf_src/linux-7.3- > rc2/arch/x86/entry/syscall_64.c:84 > > entry_SYSCALL_64_after_hwframe+0x77/0x7f > > RIP: 0033:0x590d6d > > Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 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 a8 ff ff ff f7 d8 64 89 01 48 > > RSP: 002b:00007fc89ae44fd8 EFLAGS: 00000216 ORIG_RAX: > 0000000000000010 > > RAX: ffffffffffffffda RBX: 0000000000611e7f RCX: 0000000000590d6d > > RDX: 00002000000023c0 RSI: 0000000040187542 RDI: > 000000000000000a > > RBP: 00007fc89ae45010 R08: 0000000000000000 R09: > 0000000000000000 > > R10: 0000000000000000 R11: 0000000000000216 R12: > 00007fc89ae45640 > > R13: 000000000000000b R14: 0000000000528d40 R15: > 00007fc89ae25000 > > > > ---[ end trace 0000000000000000 ]--- > > --- > >