From: Wei Fang Date: Wed, 20 May 2026 06:44:15 +0000 (+0800) Subject: net: enetc: add ratelimiting to VF mailbox error messages X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=4a995d37b537f437daa01752d39cf44c6ba9ee2c;p=thirdparty%2Fkernel%2Flinux.git net: enetc: add ratelimiting to VF mailbox error messages Sashiko reported that a buggy or malicious guest VM can flood the host kernel log by repeatedly sending VF-to-PF messages at a high rate, degrading host performance and hiding important system logs [1]. Fix by replacing dev_err()/dev_warn() with dev_err_ratelimited(), limiting output to the default kernel ratelimit. This ensures errors are still logged for debugging while preventing log flooding attacks. Link: https://sashiko.dev/#/patchset/20260511080805.2052495-1-wei.fang%40nxp.com #1 Fixes: beb74ac878c8 ("enetc: Add vf to pf messaging support") Signed-off-by: Wei Fang Reviewed-by: Harshitha Ramamurthy Link: https://patch.msgid.link/20260520064421.91569-4-wei.fang@nxp.com Signed-off-by: Jakub Kicinski --- diff --git a/drivers/net/ethernet/freescale/enetc/enetc_pf.c b/drivers/net/ethernet/freescale/enetc/enetc_pf.c index b743b6d33ccc..dea3a92c4722 100644 --- a/drivers/net/ethernet/freescale/enetc/enetc_pf.c +++ b/drivers/net/ethernet/freescale/enetc/enetc_pf.c @@ -494,8 +494,9 @@ static u16 enetc_msg_pf_set_vf_primary_mac_addr(struct enetc_pf *pf, addr = cmd->mac.sa_data; if (vf_state->flags & ENETC_VF_FLAG_PF_SET_MAC) { - dev_warn(dev, "Attempt to override PF set mac addr for VF%d\n", - vf_id); + dev_err_ratelimited(dev, + "VF%d attempted to override PF set MAC\n", + vf_id); return ENETC_MSG_CMD_STATUS_FAIL; } @@ -520,8 +521,9 @@ void enetc_msg_handle_rxmsg(struct enetc_pf *pf, int vf_id, u16 *status) break; default: *status = ENETC_MSG_CMD_STATUS_FAIL; - dev_err(dev, "command not supported (cmd_type: 0x%x)\n", - cmd_type); + dev_err_ratelimited(dev, + "command not supported (cmd_type: 0x%x)\n", + cmd_type); } }