This is a note to let you know that I've just added the patch titled
bnx2x: Fix firmware version string character counts
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bnx2x-fix-firmware-version-string-character-counts.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 1df3a8c6a9caaab3243f02d7d90c73d5e32c471d
Author: Kees Cook <keescook@xxxxxxxxxxxx>
Date: Thu Jan 25 20:10:48 2024 -0800
bnx2x: Fix firmware version string character counts
[ Upstream commit 5642c82b9463c3263c086efb002516244bd4c668 ]
A potential string truncation was reported in bnx2x_fill_fw_str(),
when a long bp->fw_ver and a long phy_fw_ver might coexist, but seems
unlikely with real-world hardware.
Use scnprintf() to indicate the intent that truncations are tolerated.
While reading this code, I found a collection of various buffer size
counting issues. None looked like they might lead to a buffer overflow
with current code (the small buffers are 20 bytes and might only ever
consume 10 bytes twice with a trailing %NUL). However, early truncation
(due to a %NUL in the middle of the string) might be happening under
likely rare conditions. Regardless fix the formatters and related
functions:
- Switch from a separate strscpy() to just adding an additional "%s" to
the format string that immediately follows it in bnx2x_fill_fw_str().
- Use sizeof() universally instead of using unbound defines.
- Fix bnx2x_7101_format_ver() and bnx2x_null_format_ver() to report the
number of characters written, not including the trailing %NUL (as
already done with the other firmware formatting functions).
- Require space for at least 1 byte in bnx2x_get_ext_phy_fw_version()
for the trailing %NUL.
- Correct the needed buffer size in bnx2x_3_seq_format_ver().
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Closes: https://lore.kernel.org/oe-kbuild-all/202401260858.jZN6vD1k-lkp@xxxxxxxxx/
Cc: Ariel Elior <aelior@xxxxxxxxxxx>
Cc: Sudarsana Kalluru <skalluru@xxxxxxxxxxx>
Cc: Manish Chopra <manishc@xxxxxxxxxxx>
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240126041044.work.220-kees@xxxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
index 4950fde82d175..b04c5b51eb598 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
@@ -147,10 +147,11 @@ void bnx2x_fill_fw_str(struct bnx2x *bp, char *buf, size_t buf_len)
phy_fw_ver[0] = '\0';
bnx2x_get_ext_phy_fw_version(&bp->link_params,
- phy_fw_ver, PHY_FW_VER_LEN);
- strscpy(buf, bp->fw_ver, buf_len);
- snprintf(buf + strlen(bp->fw_ver), 32 - strlen(bp->fw_ver),
- "bc %d.%d.%d%s%s",
+ phy_fw_ver, sizeof(phy_fw_ver));
+ /* This may become truncated. */
+ scnprintf(buf, buf_len,
+ "%sbc %d.%d.%d%s%s",
+ bp->fw_ver,
(bp->common.bc_ver & 0xff0000) >> 16,
(bp->common.bc_ver & 0xff00) >> 8,
(bp->common.bc_ver & 0xff),
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c
index bda3ccc28eca6..f920976c36f0c 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_ethtool.c
@@ -1132,7 +1132,7 @@ static void bnx2x_get_drvinfo(struct net_device *dev,
}
memset(version, 0, sizeof(version));
- bnx2x_fill_fw_str(bp, version, ETHTOOL_FWVERS_LEN);
+ bnx2x_fill_fw_str(bp, version, sizeof(version));
strlcat(info->fw_version, version, sizeof(info->fw_version));
strscpy(info->bus_info, pci_name(bp->pdev), sizeof(info->bus_info));
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c
index 02808513ffe45..ea310057fe3af 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_link.c
@@ -6163,8 +6163,8 @@ static void bnx2x_link_int_ack(struct link_params *params,
static int bnx2x_null_format_ver(u32 spirom_ver, u8 *str, u16 *len)
{
- str[0] = '\0';
- (*len)--;
+ if (*len)
+ str[0] = '\0';
return 0;
}
@@ -6173,7 +6173,7 @@ static int bnx2x_format_ver(u32 num, u8 *str, u16 *len)
u16 ret;
if (*len < 10) {
- /* Need more than 10chars for this format */
+ /* Need more than 10 chars for this format */
bnx2x_null_format_ver(num, str, len);
return -EINVAL;
}
@@ -6188,8 +6188,8 @@ static int bnx2x_3_seq_format_ver(u32 num, u8 *str, u16 *len)
{
u16 ret;
- if (*len < 10) {
- /* Need more than 10chars for this format */
+ if (*len < 9) {
+ /* Need more than 9 chars for this format */
bnx2x_null_format_ver(num, str, len);
return -EINVAL;
}
@@ -6208,7 +6208,7 @@ int bnx2x_get_ext_phy_fw_version(struct link_params *params, u8 *version,
int status = 0;
u8 *ver_p = version;
u16 remain_len = len;
- if (version == NULL || params == NULL)
+ if (version == NULL || params == NULL || len == 0)
return -EINVAL;
bp = params->bp;
@@ -11546,7 +11546,7 @@ static int bnx2x_7101_format_ver(u32 spirom_ver, u8 *str, u16 *len)
str[2] = (spirom_ver & 0xFF0000) >> 16;
str[3] = (spirom_ver & 0xFF000000) >> 24;
str[4] = '\0';
- *len -= 5;
+ *len -= 4;
return 0;
}
