* [PATCH] put_user() on struct is not nice
@ 2007-09-26 0:54 Al Viro
2007-09-26 2:05 ` Rusty Russell
0 siblings, 1 reply; 3+ messages in thread
From: Al Viro @ 2007-09-26 0:54 UTC (permalink / raw)
To: torvalds; +Cc: linux-kernel, rusty
use copy_to_user() instead...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
drivers/lguest/hypercalls.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/lguest/hypercalls.c b/drivers/lguest/hypercalls.c
index db6caac..5ecd60b 100644
--- a/drivers/lguest/hypercalls.c
+++ b/drivers/lguest/hypercalls.c
@@ -295,6 +295,6 @@ void write_timestamp(struct lguest *lg)
{
struct timespec now;
ktime_get_real_ts(&now);
- if (put_user(now, &lg->lguest_data->time))
+ if (copy_to_user(&lg->lguest_data->time, &now, sizeof(struct timespec)))
kill_guest(lg, "Writing timestamp");
}
--
1.5.3.GIT
^ permalink raw reply related [flat|nested] 3+ messages in thread* Re: [PATCH] put_user() on struct is not nice
2007-09-26 0:54 [PATCH] put_user() on struct is not nice Al Viro
@ 2007-09-26 2:05 ` Rusty Russell
2007-09-26 3:56 ` Al Viro
0 siblings, 1 reply; 3+ messages in thread
From: Rusty Russell @ 2007-09-26 2:05 UTC (permalink / raw)
To: Al Viro; +Cc: torvalds, linux-kernel
On Wed, 2007-09-26 at 01:54 +0100, Al Viro wrote:
> use copy_to_user() instead...
Thanks Al, Jes sent me the same fix which I have queued for for 2.6.24:
From: Jes Sorensen <jes@sgi.com>
Use copy_to_user() when copying a struct timespec to the guest -
put_user() cannot handle two long's in one go on a 64bit arch.
Signed-off-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
---
drivers/lguest/hypercalls.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
===================================================================
--- linux-2.6.23-rc4.orig/drivers/lguest/hypercalls.c
+++ linux-2.6.23-rc4/drivers/lguest/hypercalls.c
@@ -243,6 +243,6 @@ void write_timestamp(struct lguest *lg)
{
struct timespec now;
ktime_get_real_ts(&now);
- if (put_user(now, &lg->lguest_data->time))
+ if (copy_to_user(&lg->lguest_data->time, &now, sizeof(struct timespec)))
kill_guest(lg, "Writing timestamp");
}
^ permalink raw reply [flat|nested] 3+ messages in thread
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2007-09-26 0:54 [PATCH] put_user() on struct is not nice Al Viro
2007-09-26 2:05 ` Rusty Russell
2007-09-26 3:56 ` Al Viro
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