Hi Arnaud,

----- On 11 Feb, 2020, at 16:53, Arnaud Pouliquen arnaud.pouliquen@st.com wrote:

On 2/10/20 5:22 PM, Clement Leger wrote:

quoted

With upcoming changes in elf loader for elf64 support, section size will
be a u64. When used with da_to_va, this will potentially lead to
overflow if using the current "int" type for len argument. Change
da_to_va prototype to use a u64 for len and fix all users of this
function.

Signed-off-by: Clement Leger <redacted>
---
 drivers/remoteproc/imx_rproc.c           | 11 ++++++-----
 drivers/remoteproc/keystone_remoteproc.c |  4 ++--
 drivers/remoteproc/qcom_q6v5_adsp.c      |  2 +-
 drivers/remoteproc/qcom_q6v5_mss.c       |  2 +-
 drivers/remoteproc/qcom_q6v5_pas.c       |  2 +-
 drivers/remoteproc/qcom_q6v5_wcss.c      |  2 +-
 drivers/remoteproc/qcom_wcnss.c          |  2 +-
 drivers/remoteproc/remoteproc_core.c     |  2 +-
 drivers/remoteproc/remoteproc_internal.h |  2 +-
 drivers/remoteproc/st_slim_rproc.c       |  4 ++--
 drivers/remoteproc/wkup_m3_rproc.c       |  4 ++--
 include/linux/remoteproc.h               |  2 +-
 12 files changed, 20 insertions(+), 19 deletions(-)

diff --git a/drivers/remoteproc/imx_rproc.c b/drivers/remoteproc/imx_rproc.c
index 3e72b6f38d4b..f497f5b49b18 100644
--- a/drivers/remoteproc/imx_rproc.c
+++ b/drivers/remoteproc/imx_rproc.c

@@ -186,7 +186,7 @@ static int imx_rproc_stop(struct rproc *rproc)
 }
 
 static int imx_rproc_da_to_sys(struct imx_rproc *priv, u64 da,
-			       int len, u64 *sys)
+			       u64 len, u64 *sys)
 {
 	const struct imx_rproc_dcfg *dcfg = priv->dcfg;
 	int i;

@@ -203,19 +203,19 @@ static int imx_rproc_da_to_sys(struct imx_rproc *priv, u64

da,
 		}
 	}
 
-	dev_warn(priv->dev, "Translation failed: da = 0x%llx len = 0x%x\n",
+	dev_warn(priv->dev, "Translation failed: da = 0x%llx len = 0x%llx\n",
 		 da, len);
 	return -ENOENT;
 }
 
-static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
+static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da, u64 len)
 {
 	struct imx_rproc *priv = rproc->priv;
 	void *va = NULL;
 	u64 sys;
 	int i;
 
-	if (len <= 0)
+	if (len == 0)
 		return NULL;
 
 	/*

@@ -235,7 +235,8 @@ static void *imx_rproc_da_to_va(struct rproc *rproc, u64 da,

int len)
 		}
 	}
 
-	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%x va = 0x%p\n", da, len, va);
+	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%llx va = 0x%p\n",
+		da, len, va);
 
 	return va;
 }

diff --git a/drivers/remoteproc/keystone_remoteproc.c

b/drivers/remoteproc/keystone_remoteproc.c
index 5c4658f00b3d..466093f48814 100644

--- a/drivers/remoteproc/keystone_remoteproc.c
+++ b/drivers/remoteproc/keystone_remoteproc.c

@@ -246,7 +246,7 @@ static void keystone_rproc_kick(struct rproc *rproc, int

vqid)
  * can be used either by the remoteproc core for loading (when using kernel
  * remoteproc loader), or by any rpmsg bus drivers.
  */
-static void *keystone_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
+static void *keystone_rproc_da_to_va(struct rproc *rproc, u64 da, u64 len)
 {
 	struct keystone_rproc *ksproc = rproc->priv;
 	void __iomem *va = NULL;

@@ -255,7 +255,7 @@ static void *keystone_rproc_da_to_va(struct rproc *rproc,

u64 da, int len)
 	size_t size;
 	int i;
 
-	if (len <= 0)
+	if (len == 0)
 		return NULL;
 
 	for (i = 0; i < ksproc->num_mems; i++) {

diff --git a/drivers/remoteproc/qcom_q6v5_adsp.c

b/drivers/remoteproc/qcom_q6v5_adsp.c
index e953886b2eb7..7518e67a49e5 100644

--- a/drivers/remoteproc/qcom_q6v5_adsp.c
+++ b/drivers/remoteproc/qcom_q6v5_adsp.c

@@ -270,7 +270,7 @@ static int adsp_stop(struct rproc *rproc)
 	return ret;
 }
 
-static void *adsp_da_to_va(struct rproc *rproc, u64 da, int len)
+static void *adsp_da_to_va(struct rproc *rproc, u64 da, u64 len)
 {
 	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
 	int offset;

diff --git a/drivers/remoteproc/qcom_q6v5_mss.c

b/drivers/remoteproc/qcom_q6v5_mss.c
index 471128a2e723..248febde6fc1 100644

--- a/drivers/remoteproc/qcom_q6v5_mss.c
+++ b/drivers/remoteproc/qcom_q6v5_mss.c

@@ -1148,7 +1148,7 @@ static int q6v5_stop(struct rproc *rproc)
 	return 0;
 }
 
-static void *q6v5_da_to_va(struct rproc *rproc, u64 da, int len)
+static void *q6v5_da_to_va(struct rproc *rproc, u64 da, u64 len)
 {
 	struct q6v5 *qproc = rproc->priv;
 	int offset;

diff --git a/drivers/remoteproc/qcom_q6v5_pas.c

b/drivers/remoteproc/qcom_q6v5_pas.c
index db4b3c4bacd7..cf2cd609c90d 100644

--- a/drivers/remoteproc/qcom_q6v5_pas.c
+++ b/drivers/remoteproc/qcom_q6v5_pas.c

@@ -159,7 +159,7 @@ static int adsp_stop(struct rproc *rproc)
 	return ret;
 }
 
-static void *adsp_da_to_va(struct rproc *rproc, u64 da, int len)
+static void *adsp_da_to_va(struct rproc *rproc, u64 da, u64 len)
 {
 	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
 	int offset;

diff --git a/drivers/remoteproc/qcom_q6v5_wcss.c

b/drivers/remoteproc/qcom_q6v5_wcss.c
index f93e1e4a1cc0..3a6b82a16961 100644

--- a/drivers/remoteproc/qcom_q6v5_wcss.c
+++ b/drivers/remoteproc/qcom_q6v5_wcss.c

@@ -406,7 +406,7 @@ static int q6v5_wcss_stop(struct rproc *rproc)
 	return 0;
 }
 
-static void *q6v5_wcss_da_to_va(struct rproc *rproc, u64 da, int len)
+static void *q6v5_wcss_da_to_va(struct rproc *rproc, u64 da, u64 len)
 {
 	struct q6v5_wcss *wcss = rproc->priv;
 	int offset;

diff --git a/drivers/remoteproc/qcom_wcnss.c b/drivers/remoteproc/qcom_wcnss.c
index dc135754bb9c..f893219e45a8 100644
--- a/drivers/remoteproc/qcom_wcnss.c
+++ b/drivers/remoteproc/qcom_wcnss.c

@@ -287,7 +287,7 @@ static int wcnss_stop(struct rproc *rproc)
 	return ret;
 }
 
-static void *wcnss_da_to_va(struct rproc *rproc, u64 da, int len)
+static void *wcnss_da_to_va(struct rproc *rproc, u64 da, u64 len)
 {
 	struct qcom_wcnss *wcnss = (struct qcom_wcnss *)rproc->priv;
 	int offset;

diff --git a/drivers/remoteproc/remoteproc_core.c

b/drivers/remoteproc/remoteproc_core.c
index 307df98347ba..9e6d3c6a60ee 100644

--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c

@@ -185,7 +185,7 @@ EXPORT_SYMBOL(rproc_va_to_pa);
  * here the output of the DMA API for the carveouts, which should be more
  * correct.
  */
-void *rproc_da_to_va(struct rproc *rproc, u64 da, int len)
+void *rproc_da_to_va(struct rproc *rproc, u64 da, u64 len)

This function is exported, don't see any update in consequence...
references:
https://elixir.bootlin.com/linux/v5.6-rc1/ident/rproc_da_to_va
For instance the function rproc_trace_read use it. it quite strange that my gcc
does not warns for the cast but i suppose that some could.

Agreed, even if len should never have been a signed type since it can't be
negative. I will try to fix all callers.

An indirect consequence is that the len field in rproc_mem_entry struct should
probably been updated to u64 to be aligned.

Ok, I will do that once we settle on the type of len.

I'm still wondering about the use of size_t instead,which seems more rational
from my window.
So i you or Mathieu remember it was decided to use u64, please could remind me
the arguments?

I tried to find the notes of a meeting we had for OpenAMP but I did not found
them. Anyway, the argument was coming from Tomas or someone else, (I can't
remember) talking about a 32 bits CPU executing code on a 64 bits accelerator.
In that case, the size_t type could fail due to being only 32bits on the host
CPU but larger than 4G.

However, I can't say if it's a real usecase or not... All I can say is
that keeping it open is probably better if one day somebody comes with such
architecture.

As an alternative a check should be added for 32 bits processors to ensure that
the size is not higher than
its address range capability...

Agreed.
I was even thinking about a mecanism for remoteproc drivers to declare the type
of supported elfs files (such as EM_*, ELFCLASS* and other needed thing).
Or should it be supported by overriding .sanity_check in drivers  to reject
elf64 for instance ?

Since elf is a "specific format" and that rproc can support other formats,
I did not want to add a specific elf_sanity_check field to rproc ops.

Regards,

Clément

Regards
Arnaud

quoted

 {
 	struct rproc_mem_entry *carveout;
 	void *ptr = NULL;

diff --git a/drivers/remoteproc/remoteproc_internal.h

b/drivers/remoteproc/remoteproc_internal.h
index 493ef9262411..004867061721 100644

--- a/drivers/remoteproc/remoteproc_internal.h
+++ b/drivers/remoteproc/remoteproc_internal.h

@@ -50,7 +50,7 @@ void rproc_exit_sysfs(void);
 void rproc_free_vring(struct rproc_vring *rvring);
 int rproc_alloc_vring(struct rproc_vdev *rvdev, int i);
 
-void *rproc_da_to_va(struct rproc *rproc, u64 da, int len);
+void *rproc_da_to_va(struct rproc *rproc, u64 da, u64 len);
 phys_addr_t rproc_va_to_pa(void *cpu_addr);
 int rproc_trigger_recovery(struct rproc *rproc);
 

diff --git a/drivers/remoteproc/st_slim_rproc.c

b/drivers/remoteproc/st_slim_rproc.c
index 04492fead3c8..fc01cd879b60 100644

--- a/drivers/remoteproc/st_slim_rproc.c
+++ b/drivers/remoteproc/st_slim_rproc.c

@@ -174,7 +174,7 @@ static int slim_rproc_stop(struct rproc *rproc)
 	return 0;
 }
 
-static void *slim_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
+static void *slim_rproc_da_to_va(struct rproc *rproc, u64 da, u64 len)
 {
 	struct st_slim_rproc *slim_rproc = rproc->priv;
 	void *va = NULL;

@@ -191,7 +191,7 @@ static void *slim_rproc_da_to_va(struct rproc *rproc, u64

da, int len)
 		}
 	}
 
-	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%x va = 0x%pK\n",
+	dev_dbg(&rproc->dev, "da = 0x%llx len = 0x%llx va = 0x%pK\n",
 		da, len, va);
 
 	return va;

diff --git a/drivers/remoteproc/wkup_m3_rproc.c

b/drivers/remoteproc/wkup_m3_rproc.c
index 3984e585c847..91485b467407 100644

--- a/drivers/remoteproc/wkup_m3_rproc.c
+++ b/drivers/remoteproc/wkup_m3_rproc.c

@@ -80,14 +80,14 @@ static int wkup_m3_rproc_stop(struct rproc *rproc)
 	return 0;
 }
 
-static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
+static void *wkup_m3_rproc_da_to_va(struct rproc *rproc, u64 da, u64 len)
 {
 	struct wkup_m3_rproc *wkupm3 = rproc->priv;
 	void *va = NULL;
 	int i;
 	u32 offset;
 
-	if (len <= 0)
+	if (len == 0)
 		return NULL;
 
 	for (i = 0; i < WKUPM3_MEM_MAX; i++) {

diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 16ad66683ad0..f84bd5fe0211 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h

@@ -374,7 +374,7 @@ struct rproc_ops {
 	int (*start)(struct rproc *rproc);
 	int (*stop)(struct rproc *rproc);
 	void (*kick)(struct rproc *rproc, int vqid);
-	void * (*da_to_va)(struct rproc *rproc, u64 da, int len);
+	void * (*da_to_va)(struct rproc *rproc, u64 da, u64 len);
 	int (*parse_fw)(struct rproc *rproc, const struct firmware *fw);
 	int (*handle_rsc)(struct rproc *rproc, u32 rsc_type, void *rsc,
 			  int offset, int avail);

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