In the Linux kernel, the following vulnerability has been resolved:
net/bnx2x: Prevent access to a freed page in page_pool
Fix race condition leading to system crash during EEH error handling
During EEH error recovery, the bnx2x driver’s transmit timeout logic
could cause a race condition when handling reset tasks. The
bnx2x_tx_timeout() schedules reset tasks via bnx2x_sp_rtnl_task(),
which ultimately leads to bnx2x_nic_unload(). In bnx2x_nic_unload()
SGEs are freed using bnx2x_free_rx_sge_range(). However, this could
overlap with the EEH driver’s attempt to reset the device using
bnx2x_io_slot_reset(), which also tries to free SGEs. This race
condition can result in system crashes due to accessing freed memory
locations in bnx2x_free_rx_sge()
799 static inline void bnx2x_free_rx_sge(struct bnx2x *bp,
800 struct bnx2x_fastpath *fp, u16 index)
801 {
802 struct sw_rx_page *sw_buf = &fp->rx_page_ring[index];
803 struct page *page = sw_buf->page;
…
where sw_buf was set to NULL after the call to dma_unmap_page()
by the preceding thread.
EEH: Beginning: 'slot_reset'
PCI 0011:01:00.0#10000: EEH: Invoking bnx2x->slot_reset()
bnx2x: [bnx2x_io_slot_reset:14228(eth1)]IO slot reset initializing...
bnx2x 0011:01:00.0: enabling device (0140 -> 0142)
bnx2x: [bnx2x_io_slot_reset:14244(eth1)]IO slot reset --> driver unload
Kernel attempted to read user page (0) - exploit attempt? (uid: 0)
BUG: Kernel NULL pointer dereference on read at 0x00000000
Faulting instruction address: 0xc0080000025065fc
Oops: Kernel access of bad area, sig: 11 [#1]
.....
Call Trace:
[c000000003c67a20] [c00800000250658c] bnx2x_io_slot_reset+0x204/0x610 [bnx2x] (unreliable)
[c000000003c67af0] [c0000000000518a8] eeh_report_reset+0xb8/0xf0
[c000000003c67b60] [c000000000052130] eeh_pe_report+0x180/0x550
[c000000003c67c70] [c00000000005318c] eeh_handle_normal_event+0x84c/0xa60
[c000000003c67d50] [c000000000053a84] eeh_event_handler+0xf4/0x170
[c000000003c67da0] [c000000000194c58] kthread+0x1c8/0x1d0
[c000000003c67e10] [c00000000000cf64] ret_from_kernel_thread+0x5c/0x64
To solve this issue, we need to verify page pool allocations before
freeing.
Vendor | Product | Version | CPE |
---|---|---|---|
linux | linux_kernel | * | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h"
],
"versions": [
{
"version": "4cace675d687",
"lessThan": "7bcc090c8111",
"status": "affected",
"versionType": "git"
},
{
"version": "4cace675d687",
"lessThan": "4f37d3a7e004",
"status": "affected",
"versionType": "git"
},
{
"version": "4cace675d687",
"lessThan": "8eebff95ce95",
"status": "affected",
"versionType": "git"
},
{
"version": "4cace675d687",
"lessThan": "8ffcd3ccdbda",
"status": "affected",
"versionType": "git"
},
{
"version": "4cace675d687",
"lessThan": "cf7d8cba639a",
"status": "affected",
"versionType": "git"
},
{
"version": "4cace675d687",
"lessThan": "3a9f78b297e0",
"status": "affected",
"versionType": "git"
},
{
"version": "4cace675d687",
"lessThan": "c51f8b6930db",
"status": "affected",
"versionType": "git"
},
{
"version": "4cace675d687",
"lessThan": "44f9f1abb0ec",
"status": "affected",
"versionType": "git"
},
{
"version": "4cace675d687",
"lessThan": "d27e2da94a42",
"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/net/ethernet/broadcom/bnx2x/bnx2x_cmn.h"
],
"versions": [
{
"version": "4.2",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.2",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "4.19.311",
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.4.273",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.10.214",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.15.153",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.1.83",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.6.23",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.7.11",
"lessThanOrEqual": "6.7.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.8.2",
"lessThanOrEqual": "6.8.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.9",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]
git.kernel.org/stable/c/3a9f78b297e08ca8e88ae3ecff1f6fe2766dc5eb
git.kernel.org/stable/c/44f9f1abb0ecc43023225ab9539167facbabf0ec
git.kernel.org/stable/c/4f37d3a7e004bbf560c21441ca9c022168017ec4
git.kernel.org/stable/c/7bcc090c81116c66936a7415f2c6b1483a4bcfd9
git.kernel.org/stable/c/8eebff95ce9558be66a36aa7cfb43223f3ab4699
git.kernel.org/stable/c/8ffcd3ccdbda0c918c4a0f922ef1c17010f1b598
git.kernel.org/stable/c/c51f8b6930db3f259b8820b589f2459d2df3fc68
git.kernel.org/stable/c/cf7d8cba639ae792a42c2a137b495eac262ac36c
git.kernel.org/stable/c/d27e2da94a42655861ca4baea30c8cd65546f25d
lists.debian.org/debian-lts-announce/2024/06/msg00017.html
lists.debian.org/debian-lts-announce/2024/06/msg00020.html