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Date: Thu, 18 Apr 2019 21:33:19 +0800
From: Fuqian Huang <huangfq.daxian@...il.com>
To: oss-security@...ts.openwall.com
Subject: Linux kernel < 4.14.111 drivers/net/ethernet/chelsio/libcxgb/libcxgb_ppm.c
kernel address dumps to user space
In drivers/net/ethernet/chelsio/libcxgb/libcxgb_ppm.c:320
ppm_destory will dump the address of ppm into dmesg,
which allows local user to read the kernel address via dmesg.
static void ppm_destroy(struct kref *kref)
{
...
pr_info("ippm: kref 0, destroy %s ppm 0x%p.\n",
ppm->ndev->name, ppm);
...
}
In drivers/net/ethernet/chelsio/libcxgb/libcxgb_ppm.c:396
and drivers/net/ethernet/chelsio/libcxgb/libcxgb_ppm.c:458
and drivers/net/ethernet/chelsio/libcxgb/libcxgb_ppm.c:468,
cxgbi_ppm_init will dump the address of ppm into dmesg,
which allows local user to read the kernel address via dmesg.
int cxgbi_ppm_init(void **ppm_pp, struct net_device *ndev,
struct pci_dev *pdev, void *lldev,
struct cxgbi_tag_format *tformat,
unsigned int ppmax,
unsigned int llimit,
unsigned int start,
unsigned int reserve_factor)
{
...
if (ppm) {
pr_info("ippm: %s, ppm 0x%p,0x%p already initialized, %u/%u.\n",
ndev->name, ppm_pp, ppm, ppm->ppmax, ppmax);
kref_get(&ppm->refcnt);
return 1;
}
...
if (*ppm_pp) {
...
pr_info("ippm: %s, ppm 0x%p,0x%p already initialized, %u/%u.\n",
ndev->name, ppm_pp, *ppm_pp, ppm->ppmax, ppmax);
kref_get(&ppm->refcnt);
return 1;
}
...
pr_info("ippm %s: ppm 0x%p, 0x%p, base %u/%u, pg %lu,%u, rsvd %u,%u.\n",
ndev->name, ppm_pp, ppm, ppm->base_idx, ppm->ppmax, PAGE_SIZE,
ppm->tformat.pgsz_idx_dflt, ppm->pool_rsvd,
ppm->pool_index_max);
...
}
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