In the Linux kernel, the following vulnerability has been resolved:
parisc: Fix data TLB miss in sba_unmap_sg
Rolf Eike Beer reported the following bug:
[1274934.746891] Bad Address (null pointer deref?): Code=15 (Data TLB miss fault) at addr 0000004140000018
[1274934.746891] CPU: 3 PID: 5549 Comm: cmake Not tainted 5.15.4-gentoo-parisc64 #4
[1274934.746891] Hardware name: 9000/785/C8000
[1274934.746891]
[1274934.746891] YZrvWESTHLNXBCVMcbcbcbcbOGFRQPDI
[1274934.746891] PSW: 00001000000001001111111000001110 Not tainted
[1274934.746891] r00-03 000000ff0804fe0e 0000000040bc9bc0 00000000406760e4 0000004140000000
[1274934.746891] r04-07 0000000040b693c0 0000004140000000 000000004a2b08b0 0000000000000001
[1274934.746891] r08-11 0000000041f98810 0000000000000000 000000004a0a7000 0000000000000001
[1274934.746891] r12-15 0000000040bddbc0 0000000040c0cbc0 0000000040bddbc0 0000000040bddbc0
[1274934.746891] r16-19 0000000040bde3c0 0000000040bddbc0 0000000040bde3c0 0000000000000007
[1274934.746891] r20-23 0000000000000006 000000004a368950 0000000000000000 0000000000000001
[1274934.746891] r24-27 0000000000001fff 000000000800000e 000000004a1710f0 0000000040b693c0
[1274934.746891] r28-31 0000000000000001 0000000041f988b0 0000000041f98840 000000004a171118
[1274934.746891] sr00-03 00000000066e5800 0000000000000000 0000000000000000 00000000066e5800
[1274934.746891] sr04-07 0000000000000000 0000000000000000 0000000000000000 0000000000000000
[1274934.746891]
[1274934.746891] IASQ: 0000000000000000 0000000000000000 IAOQ: 00000000406760e8 00000000406760ec
[1274934.746891] IIR: 48780030 ISR: 0000000000000000 IOR: 0000004140000018
[1274934.746891] CPU: 3 CR30: 00000040e3a9c000 CR31: ffffffffffffffff
[1274934.746891] ORIG_R28: 0000000040acdd58
[1274934.746891] IAOQ[0]: sba_unmap_sg+0xb0/0x118
[1274934.746891] IAOQ[1]: sba_unmap_sg+0xb4/0x118
[1274934.746891] RP(r2): sba_unmap_sg+0xac/0x118
[1274934.746891] Backtrace:
[1274934.746891] [<00000000402740cc>] dma_unmap_sg_attrs+0x6c/0x70
[1274934.746891] [<000000004074d6bc>] scsi_dma_unmap+0x54/0x60
[1274934.746891] [<00000000407a3488>] mptscsih_io_done+0x150/0xd70
[1274934.746891] [<0000000040798600>] mpt_interrupt+0x168/0xa68
[1274934.746891] [<0000000040255a48>] __handle_irq_event_percpu+0xc8/0x278
[1274934.746891] [<0000000040255c34>] handle_irq_event_percpu+0x3c/0xd8
[1274934.746891] [<000000004025ecb4>] handle_percpu_irq+0xb4/0xf0
[1274934.746891] [<00000000402548e0>] generic_handle_irq+0x50/0x70
[1274934.746891] [<000000004019a254>] call_on_stack+0x18/0x24
[1274934.746891]
[1274934.746891] Kernel panic - not syncing: Bad Address (null pointer deref?)
The bug is caused by overrunning the sglist and incorrectly testing
sg_dma_len(sglist) before nents. Normally this doesn’t cause a crash,
but in this case sglist crossed a page boundary. This occurs in the
following code:
while (sg_dma_len(sglist) && nents--) {
The fix is simply to test nents first and move the decrement of nents
into the loop.
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/parisc/sba_iommu.c"
],
"versions": [
{
"version": "1da177e4c3f4",
"lessThan": "f23f0444ead4",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "de75676ee99b",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "867e50231c76",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "efccc9b0c7e2",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "f8f519d7df66",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "8c8e949ae81e",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "e40ae3133ed8",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "b7d6f44a0fa7",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/parisc/sba_iommu.c"
],
"versions": [
{
"version": "4.9.303",
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.14.268",
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.19.231",
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.4.181",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.102",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.15.25",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.16.11",
"lessThanOrEqual": "5.16.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.17",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]
git.kernel.org/stable/c/867e50231c7605547d9334904d70a181f39f2d9e
git.kernel.org/stable/c/8c8e949ae81e7f5ab58f9f9f8e9b573b93173dd2
git.kernel.org/stable/c/b7d6f44a0fa716a82969725516dc0b16bc7cd514
git.kernel.org/stable/c/de75676ee99bf9f25b1124ff301b3f7b8ba597d4
git.kernel.org/stable/c/e40ae3133ed87d6d526f3c8fc6a5f9a2d72dcdbf
git.kernel.org/stable/c/efccc9b0c7e28d0eb7918a236e59f60dc23db4c3
git.kernel.org/stable/c/f23f0444ead4d941165aa82ce2fcbb997dc00e97
git.kernel.org/stable/c/f8f519d7df66c334b5e08f896ac70ee3b53add3b