| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2021-47481: RDMA/mlx5: Initialize the ODP xarray when creating an ODP MR |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| RDMA/mlx5: Initialize the ODP xarray when creating an ODP MR |
| |
| Normally the zero fill would hide the missing initialization, but an |
| errant set to desc_size in reg_create() causes a crash: |
| |
| BUG: unable to handle page fault for address: 0000000800000000 |
| PGD 0 P4D 0 |
| Oops: 0000 [#1] SMP PTI |
| CPU: 5 PID: 890 Comm: ib_write_bw Not tainted 5.15.0-rc4+ #47 |
| Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 |
| RIP: 0010:mlx5_ib_dereg_mr+0x14/0x3b0 [mlx5_ib] |
| Code: 48 63 cd 4c 89 f7 48 89 0c 24 e8 37 30 03 e1 48 8b 0c 24 eb a0 90 0f 1f 44 00 00 41 56 41 55 41 54 55 53 48 89 fb 48 83 ec 30 <48> 8b 2f 65 48 8b 04 25 28 00 00 00 48 89 44 24 28 31 c0 8b 87 c8 |
| RSP: 0018:ffff88811afa3a60 EFLAGS: 00010286 |
| RAX: 000000000000001c RBX: 0000000800000000 RCX: 0000000000000000 |
| RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000800000000 |
| RBP: 0000000800000000 R08: 0000000000000000 R09: c0000000fffff7ff |
| R10: ffff88811afa38f8 R11: ffff88811afa38f0 R12: ffffffffa02c7ac0 |
| R13: 0000000000000000 R14: ffff88811afa3cd8 R15: ffff88810772fa00 |
| FS: 00007f47b9080740(0000) GS:ffff88852cd40000(0000) knlGS:0000000000000000 |
| CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 |
| CR2: 0000000800000000 CR3: 000000010761e003 CR4: 0000000000370ea0 |
| DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 |
| DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 |
| Call Trace: |
| mlx5_ib_free_odp_mr+0x95/0xc0 [mlx5_ib] |
| mlx5_ib_dereg_mr+0x128/0x3b0 [mlx5_ib] |
| ib_dereg_mr_user+0x45/0xb0 [ib_core] |
| ? xas_load+0x8/0x80 |
| destroy_hw_idr_uobject+0x1a/0x50 [ib_uverbs] |
| uverbs_destroy_uobject+0x2f/0x150 [ib_uverbs] |
| uobj_destroy+0x3c/0x70 [ib_uverbs] |
| ib_uverbs_cmd_verbs+0x467/0xb00 [ib_uverbs] |
| ? uverbs_finalize_object+0x60/0x60 [ib_uverbs] |
| ? ttwu_queue_wakelist+0xa9/0xe0 |
| ? pty_write+0x85/0x90 |
| ? file_tty_write.isra.33+0x214/0x330 |
| ? process_echoes+0x60/0x60 |
| ib_uverbs_ioctl+0xa7/0x110 [ib_uverbs] |
| __x64_sys_ioctl+0x10d/0x8e0 |
| ? vfs_write+0x17f/0x260 |
| do_syscall_64+0x3c/0x80 |
| entry_SYSCALL_64_after_hwframe+0x44/0xae |
| |
| Add the missing xarray initialization and remove the desc_size set. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47481 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.13 with commit a639e66703ee45745dc4057c7c2013ed9e1963a7 and fixed in 5.14.16 with commit 5f6995295f65d1ee6f36d466d26afd98eb797afe |
| Issue introduced in 5.13 with commit a639e66703ee45745dc4057c7c2013ed9e1963a7 and fixed in 5.15 with commit 5508546631a0f555d7088203dec2614e41b5106e |
| Issue introduced in 5.12.4 with commit 29f91bd26f3ba828a55cb446ecd44caacf0df026 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2021-47481 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/infiniband/hw/mlx5/mr.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/5f6995295f65d1ee6f36d466d26afd98eb797afe |
| https://git.kernel.org/stable/c/5508546631a0f555d7088203dec2614e41b5106e |
