[PATCH AUTOSEL 6.6 1/4] scsi: storvsc: Ratelimit warning logs to prevent VM denial of service
From: Easwar Hariharan eahariha@linux.microsoft.com
[ Upstream commit d2138eab8cde61e0e6f62d0713e45202e8457d6d ]
If there's a persistent error in the hypervisor, the SCSI warning for failed I/O can flood the kernel log and max out CPU utilization, preventing troubleshooting from the VM side. Ratelimit the warning so it doesn't DoS the VM.
Closes: https://github.com/microsoft/WSL/issues/9173 Signed-off-by: Easwar Hariharan eahariha@linux.microsoft.com Link: https://lore.kernel.org/r/20250107-eahariha-ratelimit-storvsc-v1-1-7fc193d1f... Reviewed-by: Michael Kelley mhklinux@outlook.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/storvsc_drv.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c index d0b55c1fa908a..b3c588b102d90 100644 --- a/drivers/scsi/storvsc_drv.c +++ b/drivers/scsi/storvsc_drv.c @@ -171,6 +171,12 @@ do { \ dev_warn(&(dev)->device, fmt, ##__VA_ARGS__); \ } while (0)
+#define storvsc_log_ratelimited(dev, level, fmt, ...) \ +do { \ + if (do_logging(level)) \ + dev_warn_ratelimited(&(dev)->device, fmt, ##__VA_ARGS__); \ +} while (0) + struct vmscsi_request { u16 length; u8 srb_status; @@ -1177,7 +1183,7 @@ static void storvsc_on_io_completion(struct storvsc_device *stor_device, int loglevel = (stor_pkt->vm_srb.cdb[0] == TEST_UNIT_READY) ? STORVSC_LOGGING_WARN : STORVSC_LOGGING_ERROR;
- storvsc_log(device, loglevel, + storvsc_log_ratelimited(device, loglevel, "tag#%d cmd 0x%x status: scsi 0x%x srb 0x%x hv 0x%x\n", scsi_cmd_to_rq(request->cmd)->tag, stor_pkt->vm_srb.cdb[0],
From: Guixin Liu kanie@linux.alibaba.com
[ Upstream commit 1e95c798d8a7f70965f0f88d4657b682ff0ec75f ]
Currently, this does not cause any issues, but I believe it is necessary to set bsg_queue to NULL after removing it to prevent potential use-after-free (UAF) access.
Signed-off-by: Guixin Liu kanie@linux.alibaba.com Link: https://lore.kernel.org/r/20241218014214.64533-3-kanie@linux.alibaba.com Reviewed-by: Avri Altman avri.altman@wdc.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/ufs/core/ufs_bsg.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/ufs/core/ufs_bsg.c b/drivers/ufs/core/ufs_bsg.c index fec5993c66c39..a6561e73c2fb2 100644 --- a/drivers/ufs/core/ufs_bsg.c +++ b/drivers/ufs/core/ufs_bsg.c @@ -216,6 +216,7 @@ void ufs_bsg_remove(struct ufs_hba *hba) return;
bsg_remove_queue(hba->bsg_queue); + hba->bsg_queue = NULL;
device_del(bsg_dev); put_device(bsg_dev);
From: Tomas Glozar tglozar@redhat.com
[ Upstream commit d6899e560366e10141189697502bc5521940c588 ]
If either SIGINT is received twice, or after a SIGALRM (that is, after timerlat was supposed to stop), abort processing events currently left in the tracefs buffer and exit immediately.
This allows the user to exit rtla without waiting for processing all events, should that take longer than wanted, at the cost of not processing all samples.
Cc: John Kacur jkacur@redhat.com Cc: Luis Goncalves lgoncalv@redhat.com Cc: Gabriele Monaco gmonaco@redhat.com Link: https://lore.kernel.org/20250116144931.649593-5-tglozar@redhat.com Signed-off-by: Tomas Glozar tglozar@redhat.com Signed-off-by: Steven Rostedt (Google) rostedt@goodmis.org Signed-off-by: Sasha Levin sashal@kernel.org --- tools/tracing/rtla/src/timerlat_hist.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/tools/tracing/rtla/src/timerlat_hist.c b/tools/tracing/rtla/src/timerlat_hist.c index 667f12f2d67f6..d13e6be3ad197 100644 --- a/tools/tracing/rtla/src/timerlat_hist.c +++ b/tools/tracing/rtla/src/timerlat_hist.c @@ -948,6 +948,14 @@ static struct osnoise_tool static int stop_tracing; static void stop_hist(int sig) { + if (stop_tracing) { + /* + * Stop requested twice in a row; abort event processing and + * exit immediately + */ + tracefs_iterate_stop(hist_inst->inst); + return; + } stop_tracing = 1; }
From: Tomas Glozar tglozar@redhat.com
[ Upstream commit 80967b354a76b360943af384c10d807d98bea5c4 ]
If either SIGINT is received twice, or after a SIGALRM (that is, after timerlat was supposed to stop), abort processing events currently left in the tracefs buffer and exit immediately.
This allows the user to exit rtla without waiting for processing all events, should that take longer than wanted, at the cost of not processing all samples.
Cc: John Kacur jkacur@redhat.com Cc: Luis Goncalves lgoncalv@redhat.com Cc: Gabriele Monaco gmonaco@redhat.com Link: https://lore.kernel.org/20250116144931.649593-6-tglozar@redhat.com Signed-off-by: Tomas Glozar tglozar@redhat.com Signed-off-by: Steven Rostedt (Google) rostedt@goodmis.org Signed-off-by: Sasha Levin sashal@kernel.org --- tools/tracing/rtla/src/timerlat_top.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/tools/tracing/rtla/src/timerlat_top.c b/tools/tracing/rtla/src/timerlat_top.c index 0915092057f85..b0c1c3735173d 100644 --- a/tools/tracing/rtla/src/timerlat_top.c +++ b/tools/tracing/rtla/src/timerlat_top.c @@ -727,6 +727,14 @@ static struct osnoise_tool static int stop_tracing; static void stop_top(int sig) { + if (stop_tracing) { + /* + * Stop requested twice in a row; abort event processing and + * exit immediately + */ + tracefs_iterate_stop(top_inst->inst); + return; + } stop_tracing = 1; }
linux-stable-mirror@lists.linaro.org
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Sasha Levin