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wil6210: add block size checks during FW load

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When loading FW from file add block size checks to ensure a
corrupted FW file will not cause the driver to write outside
the device memory.

Signed-off-by: Lior David <qca_liord@qca.qualcomm.com>
Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
This commit is contained in:
Lior David 2017-11-14 15:25:38 +02:00 committed by Kalle Valo
parent 26a6d52748
commit 705d2fde94
3 changed files with 49 additions and 21 deletions
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58
drivers/net/wireless/ath/wil6210/fw_inc.c
View File

@ -26,14 +26,17 @@
prefix_type, rowsize, \
groupsize, buf, len, ascii)
#define FW_ADDR_CHECK(ioaddr, val, msg) do { \
ioaddr = wmi_buffer(wil, val); \
if (!ioaddr) { \
wil_err_fw(wil, "bad " msg ": 0x%08x\n", \
le32_to_cpu(val)); \
return -EINVAL; \
} \
} while (0)
static bool wil_fw_addr_check(struct wil6210_priv *wil,
void __iomem **ioaddr, __le32 val,
u32 size, const char *msg)
{
*ioaddr = wmi_buffer_block(wil, val, size);
if (!(*ioaddr)) {
wil_err_fw(wil, "bad %s: 0x%08x\n", msg, le32_to_cpu(val));
return false;
}
return true;
}
/**
* wil_fw_verify - verify firmware file validity
@ -160,7 +163,8 @@ static int fw_handle_data(struct wil6210_priv *wil, const void *data,
return -EINVAL;
}
FW_ADDR_CHECK(dst, d->addr, "address");
if (!wil_fw_addr_check(wil, &dst, d->addr, s, "address"))
return -EINVAL;
wil_dbg_fw(wil, "write [0x%08x] <== %zu bytes\n", le32_to_cpu(d->addr),
s);
wil_memcpy_toio_32(dst, d->data, s);
@ -192,7 +196,8 @@ static int fw_handle_fill(struct wil6210_priv *wil, const void *data,
return -EINVAL;
}
FW_ADDR_CHECK(dst, d->addr, "address");
if (!wil_fw_addr_check(wil, &dst, d->addr, s, "address"))
return -EINVAL;
v = le32_to_cpu(d->value);
wil_dbg_fw(wil, "fill [0x%08x] <== 0x%08x, %zu bytes\n",
@ -248,7 +253,8 @@ static int fw_handle_direct_write(struct wil6210_priv *wil, const void *data,
u32 v = le32_to_cpu(block[i].value);
u32 x, y;
FW_ADDR_CHECK(dst, block[i].addr, "address");
if (!wil_fw_addr_check(wil, &dst, block[i].addr, 0, "address"))
return -EINVAL;
x = readl(dst);
y = (x & m) | (v & ~m);
@ -314,10 +320,15 @@ static int fw_handle_gateway_data(struct wil6210_priv *wil, const void *data,
wil_dbg_fw(wil, "gw write record [%3d] blocks, cmd 0x%08x\n",
n, gw_cmd);
FW_ADDR_CHECK(gwa_addr, d->gateway_addr_addr, "gateway_addr_addr");
FW_ADDR_CHECK(gwa_val, d->gateway_value_addr, "gateway_value_addr");
FW_ADDR_CHECK(gwa_cmd, d->gateway_cmd_addr, "gateway_cmd_addr");
FW_ADDR_CHECK(gwa_ctl, d->gateway_ctrl_address, "gateway_ctrl_address");
if (!wil_fw_addr_check(wil, &gwa_addr, d->gateway_addr_addr, 0,
"gateway_addr_addr") ||
!wil_fw_addr_check(wil, &gwa_val, d->gateway_value_addr, 0,
"gateway_value_addr") ||
!wil_fw_addr_check(wil, &gwa_cmd, d->gateway_cmd_addr, 0,
"gateway_cmd_addr") ||
!wil_fw_addr_check(wil, &gwa_ctl, d->gateway_ctrl_address, 0,
"gateway_ctrl_address"))
return -EINVAL;
wil_dbg_fw(wil, "gw addresses: addr 0x%08x val 0x%08x"
" cmd 0x%08x ctl 0x%08x\n",
@ -373,12 +384,19 @@ static int fw_handle_gateway_data4(struct wil6210_priv *wil, const void *data,
wil_dbg_fw(wil, "gw4 write record [%3d] blocks, cmd 0x%08x\n",
n, gw_cmd);
FW_ADDR_CHECK(gwa_addr, d->gateway_addr_addr, "gateway_addr_addr");
if (!wil_fw_addr_check(wil, &gwa_addr, d->gateway_addr_addr, 0,
"gateway_addr_addr"))
return -EINVAL;
for (k = 0; k < ARRAY_SIZE(block->value); k++)
FW_ADDR_CHECK(gwa_val[k], d->gateway_value_addr[k],
"gateway_value_addr");
FW_ADDR_CHECK(gwa_cmd, d->gateway_cmd_addr, "gateway_cmd_addr");
FW_ADDR_CHECK(gwa_ctl, d->gateway_ctrl_address, "gateway_ctrl_address");
if (!wil_fw_addr_check(wil, &gwa_val[k],
d->gateway_value_addr[k],
0, "gateway_value_addr"))
return -EINVAL;
if (!wil_fw_addr_check(wil, &gwa_cmd, d->gateway_cmd_addr, 0,
"gateway_cmd_addr") ||
!wil_fw_addr_check(wil, &gwa_ctl, d->gateway_ctrl_address, 0,
"gateway_ctrl_address"))
return -EINVAL;
wil_dbg_fw(wil, "gw4 addresses: addr 0x%08x cmd 0x%08x ctl 0x%08x\n",
le32_to_cpu(d->gateway_addr_addr),

1
drivers/net/wireless/ath/wil6210/wil6210.h
View File

@ -875,6 +875,7 @@ void wil_mbox_ring_le2cpus(struct wil6210_mbox_ring *r);
int wil_find_cid(struct wil6210_priv *wil, const u8 *mac);
void wil_set_ethtoolops(struct net_device *ndev);
void __iomem *wmi_buffer_block(struct wil6210_priv *wil, __le32 ptr, u32 size);
void __iomem *wmi_buffer(struct wil6210_priv *wil, __le32 ptr);
void __iomem *wmi_addr(struct wil6210_priv *wil, u32 ptr);
int wmi_read_hdr(struct wil6210_priv *wil, __le32 ptr,

11
drivers/net/wireless/ath/wil6210/wmi.c
View File

@ -140,13 +140,15 @@ static u32 wmi_addr_remap(u32 x)
/**
* Check address validity for WMI buffer; remap if needed
* @ptr - internal (linker) fw/ucode address
* @size - if non zero, validate the block does not
* exceed the device memory (bar)
*
* Valid buffer should be DWORD aligned
*
* return address for accessing buffer from the host;
* if buffer is not valid, return NULL.
*/
void __iomem *wmi_buffer(struct wil6210_priv *wil, __le32 ptr_)
void __iomem *wmi_buffer_block(struct wil6210_priv *wil, __le32 ptr_, u32 size)
{
u32 off;
u32 ptr = le32_to_cpu(ptr_);
@ -161,10 +163,17 @@ void __iomem *wmi_buffer(struct wil6210_priv *wil, __le32 ptr_)
off = HOSTADDR(ptr);
if (off > wil->bar_size - 4)
return NULL;
if (size && ((off + size > wil->bar_size) || (off + size < off)))
return NULL;
return wil->csr + off;
}
void __iomem *wmi_buffer(struct wil6210_priv *wil, __le32 ptr_)
{
return wmi_buffer_block(wil, ptr_, 0);
}
/**
* Check address validity
*/