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From: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
To: "Jani Nikula" <jani.nikula@linux.intel.com>,
	"Joonas Lahtinen" <joonas.lahtinen@linux.intel.com>,
	"Rodrigo Vivi" <rodrigo.vivi@intel.com>,
	"David Airlie" <airlied@linux.ie>,
	"Daniel Vetter" <daniel@ffwll.ch>,
	"Chris Wilson" <chris@chris-wilson.co.uk>,
	"Jon Bloomfield" <jon.bloomfield@intel.com>,
	"Ville Syrjälä" <ville.syrjala@linux.intel.com>
Cc: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH v3] drm/i915: Fix "mitigations" parsing if i915 is builtin
Date: Fri, 16 Apr 2021 15:11:22 +0800	[thread overview]
Message-ID: <20210416151122.593610e2@xhacker.debian> (raw)

I met below error during boot with i915 builtin if pass
"i915.mitigations=off":
[    0.015589] Booting kernel: `off' invalid for parameter `i915.mitigations'

The reason is slab subsystem isn't ready at that time, so kstrdup()
returns NULL. Fix this issue by using stack var instead of kstrdup().

Fixes: 984cadea032b ("drm/i915: Allow the sysadmin to override security mitigations")
Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
---
 Since v2:
  - Use strscpy() per Ville's suggestion.

 Since v1:
  - Ensure "str" is properly terminated. Thanks Ville for pointing this out.


 drivers/gpu/drm/i915/i915_mitigations.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_mitigations.c b/drivers/gpu/drm/i915/i915_mitigations.c
index 84f12598d145..70944764a77e 100644
--- a/drivers/gpu/drm/i915/i915_mitigations.c
+++ b/drivers/gpu/drm/i915/i915_mitigations.c
@@ -29,15 +29,13 @@ bool i915_mitigate_clear_residuals(void)
 static int mitigations_set(const char *val, const struct kernel_param *kp)
 {
 	unsigned long new = ~0UL;
-	char *str, *sep, *tok;
+	char str[64], *sep, *tok;
 	bool first = true;
 	int err = 0;
 
 	BUILD_BUG_ON(ARRAY_SIZE(names) >= BITS_PER_TYPE(mitigations));
 
-	str = kstrdup(val, GFP_KERNEL);
-	if (!str)
-		return -ENOMEM;
+	strscpy(str, val, sizeof(str));
 
 	for (sep = str; (tok = strsep(&sep, ","));) {
 		bool enable = true;
@@ -86,7 +84,6 @@ static int mitigations_set(const char *val, const struct kernel_param *kp)
 			break;
 		}
 	}
-	kfree(str);
 	if (err)
 		return err;
 
-- 
2.31.0


WARNING: multiple messages have this Message-ID (diff)
From: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
To: "Jani Nikula" <jani.nikula@linux.intel.com>,
	"Joonas Lahtinen" <joonas.lahtinen@linux.intel.com>,
	"Rodrigo Vivi" <rodrigo.vivi@intel.com>,
	"David Airlie" <airlied@linux.ie>,
	"Daniel Vetter" <daniel@ffwll.ch>,
	"Chris Wilson" <chris@chris-wilson.co.uk>,
	"Jon Bloomfield" <jon.bloomfield@intel.com>,
	"Ville Syrjälä" <ville.syrjala@linux.intel.com>
Cc: intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org,
	dri-devel@lists.freedesktop.org
Subject: [PATCH v3] drm/i915: Fix "mitigations" parsing if i915 is builtin
Date: Fri, 16 Apr 2021 15:11:22 +0800	[thread overview]
Message-ID: <20210416151122.593610e2@xhacker.debian> (raw)

I met below error during boot with i915 builtin if pass
"i915.mitigations=off":
[    0.015589] Booting kernel: `off' invalid for parameter `i915.mitigations'

The reason is slab subsystem isn't ready at that time, so kstrdup()
returns NULL. Fix this issue by using stack var instead of kstrdup().

Fixes: 984cadea032b ("drm/i915: Allow the sysadmin to override security mitigations")
Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
---
 Since v2:
  - Use strscpy() per Ville's suggestion.

 Since v1:
  - Ensure "str" is properly terminated. Thanks Ville for pointing this out.


 drivers/gpu/drm/i915/i915_mitigations.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_mitigations.c b/drivers/gpu/drm/i915/i915_mitigations.c
index 84f12598d145..70944764a77e 100644
--- a/drivers/gpu/drm/i915/i915_mitigations.c
+++ b/drivers/gpu/drm/i915/i915_mitigations.c
@@ -29,15 +29,13 @@ bool i915_mitigate_clear_residuals(void)
 static int mitigations_set(const char *val, const struct kernel_param *kp)
 {
 	unsigned long new = ~0UL;
-	char *str, *sep, *tok;
+	char str[64], *sep, *tok;
 	bool first = true;
 	int err = 0;
 
 	BUILD_BUG_ON(ARRAY_SIZE(names) >= BITS_PER_TYPE(mitigations));
 
-	str = kstrdup(val, GFP_KERNEL);
-	if (!str)
-		return -ENOMEM;
+	strscpy(str, val, sizeof(str));
 
 	for (sep = str; (tok = strsep(&sep, ","));) {
 		bool enable = true;
@@ -86,7 +84,6 @@ static int mitigations_set(const char *val, const struct kernel_param *kp)
 			break;
 		}
 	}
-	kfree(str);
 	if (err)
 		return err;
 
-- 
2.31.0

_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

WARNING: multiple messages have this Message-ID (diff)
From: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
To: "Jani Nikula" <jani.nikula@linux.intel.com>,
	"Joonas Lahtinen" <joonas.lahtinen@linux.intel.com>,
	"Rodrigo Vivi" <rodrigo.vivi@intel.com>,
	"David Airlie" <airlied@linux.ie>,
	"Daniel Vetter" <daniel@ffwll.ch>,
	"Chris Wilson" <chris@chris-wilson.co.uk>,
	"Jon Bloomfield" <jon.bloomfield@intel.com>,
	"Ville Syrjälä" <ville.syrjala@linux.intel.com>
Cc: intel-gfx@lists.freedesktop.org, linux-kernel@vger.kernel.org,
	dri-devel@lists.freedesktop.org
Subject: [Intel-gfx] [PATCH v3] drm/i915: Fix "mitigations" parsing if i915 is builtin
Date: Fri, 16 Apr 2021 15:11:22 +0800	[thread overview]
Message-ID: <20210416151122.593610e2@xhacker.debian> (raw)

I met below error during boot with i915 builtin if pass
"i915.mitigations=off":
[    0.015589] Booting kernel: `off' invalid for parameter `i915.mitigations'

The reason is slab subsystem isn't ready at that time, so kstrdup()
returns NULL. Fix this issue by using stack var instead of kstrdup().

Fixes: 984cadea032b ("drm/i915: Allow the sysadmin to override security mitigations")
Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
---
 Since v2:
  - Use strscpy() per Ville's suggestion.

 Since v1:
  - Ensure "str" is properly terminated. Thanks Ville for pointing this out.


 drivers/gpu/drm/i915/i915_mitigations.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_mitigations.c b/drivers/gpu/drm/i915/i915_mitigations.c
index 84f12598d145..70944764a77e 100644
--- a/drivers/gpu/drm/i915/i915_mitigations.c
+++ b/drivers/gpu/drm/i915/i915_mitigations.c
@@ -29,15 +29,13 @@ bool i915_mitigate_clear_residuals(void)
 static int mitigations_set(const char *val, const struct kernel_param *kp)
 {
 	unsigned long new = ~0UL;
-	char *str, *sep, *tok;
+	char str[64], *sep, *tok;
 	bool first = true;
 	int err = 0;
 
 	BUILD_BUG_ON(ARRAY_SIZE(names) >= BITS_PER_TYPE(mitigations));
 
-	str = kstrdup(val, GFP_KERNEL);
-	if (!str)
-		return -ENOMEM;
+	strscpy(str, val, sizeof(str));
 
 	for (sep = str; (tok = strsep(&sep, ","));) {
 		bool enable = true;
@@ -86,7 +84,6 @@ static int mitigations_set(const char *val, const struct kernel_param *kp)
 			break;
 		}
 	}
-	kfree(str);
 	if (err)
 		return err;
 
-- 
2.31.0

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

             reply	other threads:[~2021-04-16  7:11 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-16  7:11 Jisheng Zhang [this message]
2021-04-16  7:11 ` [Intel-gfx] [PATCH v3] drm/i915: Fix "mitigations" parsing if i915 is builtin Jisheng Zhang
2021-04-16  7:11 ` Jisheng Zhang
2021-04-19 14:07 ` [Intel-gfx] ✗ Fi.CI.DOCS: warning for drm/i915: Fix "mitigations" parsing if i915 is builtin (rev3) Patchwork
2021-04-19 14:31 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
2021-04-19 17:31 ` [Intel-gfx] ✓ Fi.CI.IGT: " Patchwork

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