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From: Vladimir Riabchun <vladimir.riabchun@virtuozzo.com>
To: vasileios.almpanis@virtuozzo.com, ptikhomirov@virtuozzo.com,
	Konstantin Khorenko <khorenko@virtuozzo.com>
Cc: devel@openvz.org
Subject: [Devel] [PATCH hci-8.1 v3 1/6] ve/printk: Add sanity checks in ve_printk functions
Date: Mon, 12 Oct 2026 00:52:28 +0200	[thread overview]
Message-ID: <20261012-ve-printk-irq-v3-1-efc95fd5c78a@virtuozzo.com> (raw)
In-Reply-To: <20261012-ve-printk-irq-v3-0-efc95fd5c78a@virtuozzo.com>

This patch adds dst sanity check and reorders VE_LOG checks
in if.

https://virtuozzo.atlassian.net/browse/VSTOR-146839

Feature: ve printk
Signed-off-by: Vladimir Riabchun <vladimir.riabchun@virtuozzo.com>
---
 drivers/base/core.c    | 4 +++-
 kernel/printk/printk.c | 8 ++++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index ebc6c5570a4d..2d233ffb5661 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -4945,12 +4945,14 @@ int ve_dev_printk_emit(int dst, int level, const struct device *dev, const char
 	va_list args, args2;
 	int r;
 
+	WARN_ON_ONCE(!dst || (dst & ~VE_LOG_BOTH));
+
 	va_start(args, fmt);
 	va_copy(args2, args);
 
 	if (ve_is_super(get_exec_env()) || (dst & VE0_LOG))
 		r = dev_vprintk_emit(level, dev, fmt, args);
-	if (!ve_is_super(get_exec_env()) && (dst & VE_LOG))
+	if ((dst & VE_LOG) && !ve_is_super(get_exec_env()))
 		r = ve_dev_vprintk_emit(level, dev, fmt, args2);
 
 	va_end(args2);
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 8940b36e790b..efe2c3279c85 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2535,10 +2535,12 @@ static asmlinkage int ve_vprintk(int dst, const char *fmt, va_list args)
 	va_list args2;
 	int r = 0;
 
+	WARN_ON_ONCE(!dst || (dst & ~VE_LOG_BOTH));
+
 	va_copy(args2, args);
 	if (ve_is_super(get_exec_env()) || (dst & VE0_LOG))
 		r = vprintk(fmt, args);
-	if (!ve_is_super(get_exec_env()) && (dst & VE_LOG))
+	if ((dst & VE_LOG) && !ve_is_super(get_exec_env()))
 		r = ve_vprintk_emit(0, LOGLEVEL_DEFAULT, NULL, fmt, args2);
 	va_end(args2);
 
@@ -2567,10 +2569,12 @@ static asmlinkage int ve_vprintk_deferred(int dst, const char *fmt, va_list args
 	va_list args2;
 	int r = 0;
 
+	WARN_ON_ONCE(!dst || (dst & ~VE_LOG_BOTH));
+
 	va_copy(args2, args);
 	if (ve_is_super(get_exec_env()) || (dst & VE0_LOG))
 		r = vprintk_emit(0, LOGLEVEL_SCHED, NULL, fmt, args);
-	if (!ve_is_super(get_exec_env()) && (dst & VE_LOG))
+	if ((dst & VE_LOG) && !ve_is_super(get_exec_env()))
 		r = ve_vprintk_emit(0, LOGLEVEL_SCHED, NULL, fmt, args2);
 	va_end(args2);
 

-- 
2.52.0

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  reply	other threads:[~2026-10-11 22:54 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-11 22:52 [Devel] [PATCH hci-8.1 v3 0/6] ve/printk: Fix logs leakage via ve_printk called from IRQ context Vladimir Riabchun
2026-10-11 22:52 ` Vladimir Riabchun [this message]
2026-10-11 22:57   ` [Devel] [PATCH hci-8.1 v3 1/6] ve/printk: Add sanity checks in ve_printk functions no-reply
2026-10-11 22:52 ` [Devel] [PATCH hci-8.1 v3 2/6] ve/printk: Report potentially leaking usage of " Vladimir Riabchun
2026-10-11 22:59   ` no-reply
2026-10-11 22:52 ` [Devel] [PATCH hci-8.1 v3 3/6] ve/printk: Specify ve in printks Vladimir Riabchun
2026-10-11 23:02   ` no-reply
2026-10-11 22:52 ` [Devel] [PATCH hci-8.1 v3 4/6] ve/printk: Fix time virtualization Vladimir Riabchun
2026-10-11 23:03   ` no-reply
2026-10-11 22:52 ` [Devel] [PATCH hci-8.1 v3 5/6] ve/failcount: Use ve_printk with specified ve Vladimir Riabchun
2026-10-11 23:05   ` no-reply
2026-10-11 22:52 ` [Devel] [PATCH hci-8.1 v3 6/6] ve: add neigh_tbl failcounter Vladimir Riabchun
2026-10-11 23:04   ` no-reply
2026-10-12  7:59   ` Vasileios Almpanis
2026-10-12  7:59 ` [Devel] [PATCH hci-8.1 v3 0/6] ve/printk: Fix logs leakage via ve_printk called from IRQ context Vasileios Almpanis

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