* [PATCH] dma: stm32: replace "%p" with "%pK"
@ 2018-07-06 13:02 Benjamin Gaignard
2018-07-06 19:38 ` Geert Uytterhoeven
2018-07-09 17:27 ` Vinod
0 siblings, 2 replies; 4+ messages in thread
From: Benjamin Gaignard @ 2018-07-06 13:02 UTC (permalink / raw)
To: vkoul, dan.j.williams, mcoquelin.stm32, alexandre.torgue
Cc: dmaengine, linux-arm-kernel, linux-kernel, Benjamin Gaignard
The format specifier "%p" can leak kernel addresses.
Use "%pK" instead.
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
---
drivers/dma/stm32-dma.c | 4 ++--
drivers/dma/stm32-mdma.c | 8 ++++----
2 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/drivers/dma/stm32-dma.c b/drivers/dma/stm32-dma.c
index 8c5807362a25..379e8d534e61 100644
--- a/drivers/dma/stm32-dma.c
+++ b/drivers/dma/stm32-dma.c
@@ -594,7 +594,7 @@ static void stm32_dma_start_transfer(struct stm32_dma_chan *chan)
chan->busy = true;
- dev_dbg(chan2dev(chan), "vchan %p: started\n", &chan->vchan);
+ dev_dbg(chan2dev(chan), "vchan %pK: started\n", &chan->vchan);
}
static void stm32_dma_configure_next_sg(struct stm32_dma_chan *chan)
@@ -693,7 +693,7 @@ static void stm32_dma_issue_pending(struct dma_chan *c)
spin_lock_irqsave(&chan->vchan.lock, flags);
if (vchan_issue_pending(&chan->vchan) && !chan->desc && !chan->busy) {
- dev_dbg(chan2dev(chan), "vchan %p: issued\n", &chan->vchan);
+ dev_dbg(chan2dev(chan), "vchan %pK: issued\n", &chan->vchan);
stm32_dma_start_transfer(chan);
}
diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c
index 9dc450b7ace6..06dd1725375e 100644
--- a/drivers/dma/stm32-mdma.c
+++ b/drivers/dma/stm32-mdma.c
@@ -1170,7 +1170,7 @@ static void stm32_mdma_start_transfer(struct stm32_mdma_chan *chan)
chan->busy = true;
- dev_dbg(chan2dev(chan), "vchan %p: started\n", &chan->vchan);
+ dev_dbg(chan2dev(chan), "vchan %pK: started\n", &chan->vchan);
}
static void stm32_mdma_issue_pending(struct dma_chan *c)
@@ -1183,7 +1183,7 @@ static void stm32_mdma_issue_pending(struct dma_chan *c)
if (!vchan_issue_pending(&chan->vchan))
goto end;
- dev_dbg(chan2dev(chan), "vchan %p: issued\n", &chan->vchan);
+ dev_dbg(chan2dev(chan), "vchan %pK: issued\n", &chan->vchan);
if (!chan->desc && !chan->busy)
stm32_mdma_start_transfer(chan);
@@ -1203,7 +1203,7 @@ static int stm32_mdma_pause(struct dma_chan *c)
spin_unlock_irqrestore(&chan->vchan.lock, flags);
if (!ret)
- dev_dbg(chan2dev(chan), "vchan %p: pause\n", &chan->vchan);
+ dev_dbg(chan2dev(chan), "vchan %pK: pause\n", &chan->vchan);
return ret;
}
@@ -1240,7 +1240,7 @@ static int stm32_mdma_resume(struct dma_chan *c)
spin_unlock_irqrestore(&chan->vchan.lock, flags);
- dev_dbg(chan2dev(chan), "vchan %p: resume\n", &chan->vchan);
+ dev_dbg(chan2dev(chan), "vchan %pK: resume\n", &chan->vchan);
return 0;
}
--
2.15.0
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] dma: stm32: replace "%p" with "%pK"
2018-07-06 13:02 [PATCH] dma: stm32: replace "%p" with "%pK" Benjamin Gaignard
@ 2018-07-06 19:38 ` Geert Uytterhoeven
2018-07-07 11:28 ` Benjamin Gaignard
2018-07-09 17:27 ` Vinod
1 sibling, 1 reply; 4+ messages in thread
From: Geert Uytterhoeven @ 2018-07-06 19:38 UTC (permalink / raw)
To: Benjamin Gaignard
Cc: vkoul, Dan Williams, Maxime Coquelin, Alexandre Torgue,
dmaengine, Linux Kernel Mailing List, Linux ARM,
Benjamin Gaignard
Hi Benjamin,
On Fri, Jul 6, 2018 at 3:03 PM Benjamin Gaignard
<benjamin.gaignard@linaro.org> wrote:
> The format specifier "%p" can leak kernel addresses.
> Use "%pK" instead.
Still? Isn't the value randomized these days?
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] dma: stm32: replace "%p" with "%pK"
2018-07-06 19:38 ` Geert Uytterhoeven
@ 2018-07-07 11:28 ` Benjamin Gaignard
0 siblings, 0 replies; 4+ messages in thread
From: Benjamin Gaignard @ 2018-07-07 11:28 UTC (permalink / raw)
To: Geert Uytterhoeven
Cc: vkoul, Dan Williams, Maxime Coquelin, Alexandre Torgue,
dmaengine, Linux Kernel Mailing List, Linux ARM,
Benjamin Gaignard
2018-07-06 21:38 GMT+02:00 Geert Uytterhoeven <geert@linux-m68k.org>:
> Hi Benjamin,
>
> On Fri, Jul 6, 2018 at 3:03 PM Benjamin Gaignard
> <benjamin.gaignard@linaro.org> wrote:
>> The format specifier "%p" can leak kernel addresses.
>> Use "%pK" instead.
>
> Still? Isn't the value randomized these days?
%p give an hashed value, with %pK you can use a sysctl to get the real
value if you are root
>
> Gr{oetje,eeting}s,
>
> Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
> -- Linus Torvalds
--
Benjamin Gaignard
Graphic Study Group
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] dma: stm32: replace "%p" with "%pK"
2018-07-06 13:02 [PATCH] dma: stm32: replace "%p" with "%pK" Benjamin Gaignard
2018-07-06 19:38 ` Geert Uytterhoeven
@ 2018-07-09 17:27 ` Vinod
1 sibling, 0 replies; 4+ messages in thread
From: Vinod @ 2018-07-09 17:27 UTC (permalink / raw)
To: Benjamin Gaignard
Cc: dan.j.williams, mcoquelin.stm32, alexandre.torgue, dmaengine,
linux-arm-kernel, linux-kernel, Benjamin Gaignard
On 06-07-18, 15:02, Benjamin Gaignard wrote:
> The format specifier "%p" can leak kernel addresses.
> Use "%pK" instead.
The subsystem name is 'dmaengine' and not dma.
The git log on the subsystem should have told you this
Applied after fixing the tag, thanks.
--
~Vinod
^ permalink raw reply [flat|nested] 4+ messages in thread
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2018-07-06 13:02 [PATCH] dma: stm32: replace "%p" with "%pK" Benjamin Gaignard
2018-07-06 19:38 ` Geert Uytterhoeven
2018-07-07 11:28 ` Benjamin Gaignard
2018-07-09 17:27 ` Vinod
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