| 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-2021-47468: isdn: mISDN: Fix sleeping function called from invalid context |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| isdn: mISDN: Fix sleeping function called from invalid context |
| |
| The driver can call card->isac.release() function from an atomic |
| context. |
| |
| Fix this by calling this function after releasing the lock. |
| |
| The following log reveals it: |
| |
| [ 44.168226 ] BUG: sleeping function called from invalid context at kernel/workqueue.c:3018 |
| [ 44.168941 ] in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 5475, name: modprobe |
| [ 44.169574 ] INFO: lockdep is turned off. |
| [ 44.169899 ] irq event stamp: 0 |
| [ 44.170160 ] hardirqs last enabled at (0): [<0000000000000000>] 0x0 |
| [ 44.170627 ] hardirqs last disabled at (0): [<ffffffff814209ed>] copy_process+0x132d/0x3e00 |
| [ 44.171240 ] softirqs last enabled at (0): [<ffffffff81420a1a>] copy_process+0x135a/0x3e00 |
| [ 44.171852 ] softirqs last disabled at (0): [<0000000000000000>] 0x0 |
| [ 44.172318 ] Preemption disabled at: |
| [ 44.172320 ] [<ffffffffa009b0a9>] nj_release+0x69/0x500 [netjet] |
| [ 44.174441 ] Call Trace: |
| [ 44.174630 ] dump_stack_lvl+0xa8/0xd1 |
| [ 44.174912 ] dump_stack+0x15/0x17 |
| [ 44.175166 ] ___might_sleep+0x3a2/0x510 |
| [ 44.175459 ] ? nj_release+0x69/0x500 [netjet] |
| [ 44.175791 ] __might_sleep+0x82/0xe0 |
| [ 44.176063 ] ? start_flush_work+0x20/0x7b0 |
| [ 44.176375 ] start_flush_work+0x33/0x7b0 |
| [ 44.176672 ] ? trace_irq_enable_rcuidle+0x85/0x170 |
| [ 44.177034 ] ? kasan_quarantine_put+0xaa/0x1f0 |
| [ 44.177372 ] ? kasan_quarantine_put+0xaa/0x1f0 |
| [ 44.177711 ] __flush_work+0x11a/0x1a0 |
| [ 44.177991 ] ? flush_work+0x20/0x20 |
| [ 44.178257 ] ? lock_release+0x13c/0x8f0 |
| [ 44.178550 ] ? __kasan_check_write+0x14/0x20 |
| [ 44.178872 ] ? do_raw_spin_lock+0x148/0x360 |
| [ 44.179187 ] ? read_lock_is_recursive+0x20/0x20 |
| [ 44.179530 ] ? __kasan_check_read+0x11/0x20 |
| [ 44.179846 ] ? do_raw_spin_unlock+0x55/0x900 |
| [ 44.180168 ] ? ____kasan_slab_free+0x116/0x140 |
| [ 44.180505 ] ? _raw_spin_unlock_irqrestore+0x41/0x60 |
| [ 44.180878 ] ? skb_queue_purge+0x1a3/0x1c0 |
| [ 44.181189 ] ? kfree+0x13e/0x290 |
| [ 44.181438 ] flush_work+0x17/0x20 |
| [ 44.181695 ] mISDN_freedchannel+0xe8/0x100 |
| [ 44.182006 ] isac_release+0x210/0x260 [mISDNipac] |
| [ 44.182366 ] nj_release+0xf6/0x500 [netjet] |
| [ 44.182685 ] nj_remove+0x48/0x70 [netjet] |
| [ 44.182989 ] pci_device_remove+0xa9/0x250 |
| |
| The Linux kernel CVE team has assigned CVE-2021-47468 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.4.290 with commit 6f95c97e0f9d6eb39c3f2cb45e8fa4268d1b372b |
| Fixed in 4.9.288 with commit ef269a8808cb1759245a98a7fe16fceaebad894c |
| Fixed in 4.14.253 with commit 37e4f57b22cc5ebb3f80cf0f74fdeb487f082367 |
| Fixed in 4.19.214 with commit a5b34409d3fc52114c828be4adbc30744fa3258b |
| Fixed in 5.4.156 with commit 4054b869dc263228d30a4755800b78f0f2ba0c89 |
| Fixed in 5.10.76 with commit 9f591cbdbed3d7822b2bdba89b34a6d7b434317d |
| Fixed in 5.14.15 with commit f5966ba53013149bcf94e1536644a958dd00a026 |
| Fixed in 5.15 with commit 6510e80a0b81b5d814e3aea6297ba42f5e76f73c |
| |
| 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-2021-47468 |
| 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/isdn/hardware/mISDN/netjet.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/6f95c97e0f9d6eb39c3f2cb45e8fa4268d1b372b |
| https://git.kernel.org/stable/c/ef269a8808cb1759245a98a7fe16fceaebad894c |
| https://git.kernel.org/stable/c/37e4f57b22cc5ebb3f80cf0f74fdeb487f082367 |
| https://git.kernel.org/stable/c/a5b34409d3fc52114c828be4adbc30744fa3258b |
| https://git.kernel.org/stable/c/4054b869dc263228d30a4755800b78f0f2ba0c89 |
| https://git.kernel.org/stable/c/9f591cbdbed3d7822b2bdba89b34a6d7b434317d |
| https://git.kernel.org/stable/c/f5966ba53013149bcf94e1536644a958dd00a026 |
| https://git.kernel.org/stable/c/6510e80a0b81b5d814e3aea6297ba42f5e76f73c |
