* [PATCH] kernel: dma-debug: fix return value of __setup handlers
@ 2022-02-28 22:04 ` Randy Dunlap
0 siblings, 0 replies; 4+ messages in thread
From: Randy Dunlap @ 2022-02-28 22:04 UTC (permalink / raw)
To: linux-kernel
Cc: Randy Dunlap, Igor Zhbanov, Joerg Roedel, Christoph Hellwig,
Marek Szyprowski, iommu, Robin Murphy
When valid kernel command line parameters
dma_debug=off dma_debug_entries=100
are used, they are reported as Unknown parameters and added to init's
environment strings, polluting it.
Unknown kernel command line parameters "BOOT_IMAGE=/boot/bzImage-517rc5
dma_debug=off dma_debug_entries=100", will be passed to user space.
and
Run /sbin/init as init process
with arguments:
/sbin/init
with environment:
HOME=/
TERM=linux
BOOT_IMAGE=/boot/bzImage-517rc5
dma_debug=off
dma_debug_entries=100
Return 1 from these __setup handlers to indicate that the command line
option has been handled.
Fixes: 59d3daafa1726 ("dma-debug: add kernel command line parameters")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Igor Zhbanov <i.zhbanov@omprussia.ru>
Link: lore.kernel.org/r/64644a2f-4a20-bab3-1e15-3b2cdd0defe3@omprussia.ru
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: iommu@lists.linux-foundation.org
Cc: Robin Murphy <robin.murphy@arm.com>
---
kernel/dma/debug.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- linux-next-20220228.orig/kernel/dma/debug.c
+++ linux-next-20220228/kernel/dma/debug.c
@@ -927,7 +927,7 @@ static __init int dma_debug_cmdline(char
global_disable = true;
}
- return 0;
+ return 1;
}
static __init int dma_debug_entries_cmdline(char *str)
@@ -936,7 +936,7 @@ static __init int dma_debug_entries_cmdl
return -EINVAL;
if (!get_option(&str, &nr_prealloc_entries))
nr_prealloc_entries = PREALLOC_DMA_DEBUG_ENTRIES;
- return 0;
+ return 1;
}
__setup("dma_debug=", dma_debug_cmdline);
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH] kernel: dma-debug: fix return value of __setup handlers
@ 2022-02-28 22:04 ` Randy Dunlap
0 siblings, 0 replies; 4+ messages in thread
From: Randy Dunlap @ 2022-02-28 22:04 UTC (permalink / raw)
To: linux-kernel
Cc: Randy Dunlap, Igor Zhbanov, iommu, Robin Murphy, Christoph Hellwig
When valid kernel command line parameters
dma_debug=off dma_debug_entries=100
are used, they are reported as Unknown parameters and added to init's
environment strings, polluting it.
Unknown kernel command line parameters "BOOT_IMAGE=/boot/bzImage-517rc5
dma_debug=off dma_debug_entries=100", will be passed to user space.
and
Run /sbin/init as init process
with arguments:
/sbin/init
with environment:
HOME=/
TERM=linux
BOOT_IMAGE=/boot/bzImage-517rc5
dma_debug=off
dma_debug_entries=100
Return 1 from these __setup handlers to indicate that the command line
option has been handled.
Fixes: 59d3daafa1726 ("dma-debug: add kernel command line parameters")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Igor Zhbanov <i.zhbanov@omprussia.ru>
Link: lore.kernel.org/r/64644a2f-4a20-bab3-1e15-3b2cdd0defe3@omprussia.ru
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: iommu@lists.linux-foundation.org
Cc: Robin Murphy <robin.murphy@arm.com>
---
kernel/dma/debug.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- linux-next-20220228.orig/kernel/dma/debug.c
+++ linux-next-20220228/kernel/dma/debug.c
@@ -927,7 +927,7 @@ static __init int dma_debug_cmdline(char
global_disable = true;
}
- return 0;
+ return 1;
}
static __init int dma_debug_entries_cmdline(char *str)
@@ -936,7 +936,7 @@ static __init int dma_debug_entries_cmdl
return -EINVAL;
if (!get_option(&str, &nr_prealloc_entries))
nr_prealloc_entries = PREALLOC_DMA_DEBUG_ENTRIES;
- return 0;
+ return 1;
}
__setup("dma_debug=", dma_debug_cmdline);
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iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] kernel: dma-debug: fix return value of __setup handlers
2022-02-28 22:04 ` Randy Dunlap
@ 2022-03-03 11:02 ` Christoph Hellwig
-1 siblings, 0 replies; 4+ messages in thread
From: Christoph Hellwig @ 2022-03-03 11:02 UTC (permalink / raw)
To: Randy Dunlap
Cc: linux-kernel, Igor Zhbanov, Joerg Roedel, Christoph Hellwig,
Marek Szyprowski, iommu, Robin Murphy
Thanks,
applied to the dma-mapping tree.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH] kernel: dma-debug: fix return value of __setup handlers
@ 2022-03-03 11:02 ` Christoph Hellwig
0 siblings, 0 replies; 4+ messages in thread
From: Christoph Hellwig @ 2022-03-03 11:02 UTC (permalink / raw)
To: Randy Dunlap
Cc: linux-kernel, Igor Zhbanov, iommu, Robin Murphy, Christoph Hellwig
Thanks,
applied to the dma-mapping tree.
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2022-03-03 11:02 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2022-02-28 22:04 [PATCH] kernel: dma-debug: fix return value of __setup handlers Randy Dunlap
2022-02-28 22:04 ` Randy Dunlap
2022-03-03 11:02 ` Christoph Hellwig
2022-03-03 11:02 ` Christoph Hellwig
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