* [PATCH] ipc: shm: fix information leak to userland
@ 2010-10-30 9:04 ` Vasiliy Kulikov
0 siblings, 0 replies; 8+ messages in thread
From: Vasiliy Kulikov @ 2010-10-30 9:04 UTC (permalink / raw)
To: kernel-janitors
Cc: Al Viro, Andrew Morton, Helge Deller, David Howells,
Hugh Dickins, linux-kernel
Structure shmid_ds is copied to userland with shm_unused{,2,3}
fields unitialized. It leads to leaking of contents of kernel stack memory.
Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
---
Compile tested.
ipc/shm.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/ipc/shm.c b/ipc/shm.c
index fd658a1..7d3bb22 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -479,6 +479,7 @@ static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_
{
struct shmid_ds out;
+ memset(&out, 0, sizeof(out));
ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm);
out.shm_segsz = in->shm_segsz;
out.shm_atime = in->shm_atime;
--
1.7.0.4
^ permalink raw reply related [flat|nested] 8+ messages in thread
* [PATCH] ipc: shm: fix information leak to userland
@ 2010-10-30 9:04 ` Vasiliy Kulikov
0 siblings, 0 replies; 8+ messages in thread
From: Vasiliy Kulikov @ 2010-10-30 9:04 UTC (permalink / raw)
To: kernel-janitors
Cc: Al Viro, Andrew Morton, Helge Deller, David Howells,
Hugh Dickins, linux-kernel
Structure shmid_ds is copied to userland with shm_unused{,2,3}
fields unitialized. It leads to leaking of contents of kernel stack memory.
Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
---
Compile tested.
ipc/shm.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/ipc/shm.c b/ipc/shm.c
index fd658a1..7d3bb22 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -479,6 +479,7 @@ static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_
{
struct shmid_ds out;
+ memset(&out, 0, sizeof(out));
ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm);
out.shm_segsz = in->shm_segsz;
out.shm_atime = in->shm_atime;
--
1.7.0.4
^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCH] ipc: shm: fix information leak to userland
2010-10-30 9:04 ` Vasiliy Kulikov
@ 2010-10-30 9:06 ` Al Viro
-1 siblings, 0 replies; 8+ messages in thread
From: Al Viro @ 2010-10-30 9:06 UTC (permalink / raw)
To: Vasiliy Kulikov
Cc: kernel-janitors, Andrew Morton, Helge Deller, David Howells,
Hugh Dickins, linux-kernel
On Sat, Oct 30, 2010 at 01:04:37PM +0400, Vasiliy Kulikov wrote:
> Structure shmid_ds is copied to userland with shm_unused{,2,3}
> fields unitialized. It leads to leaking of contents of kernel stack memory.
ACK; send to Linus and add Cc: stable@kernel.org
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] ipc: shm: fix information leak to userland
@ 2010-10-30 9:06 ` Al Viro
0 siblings, 0 replies; 8+ messages in thread
From: Al Viro @ 2010-10-30 9:06 UTC (permalink / raw)
To: Vasiliy Kulikov
Cc: kernel-janitors, Andrew Morton, Helge Deller, David Howells,
Hugh Dickins, linux-kernel
On Sat, Oct 30, 2010 at 01:04:37PM +0400, Vasiliy Kulikov wrote:
> Structure shmid_ds is copied to userland with shm_unused{,2,3}
> fields unitialized. It leads to leaking of contents of kernel stack memory.
ACK; send to Linus and add Cc: stable@kernel.org
^ permalink raw reply [flat|nested] 8+ messages in thread
* [PATCH] ipc: shm: fix information leak to userland
2010-10-30 9:06 ` Al Viro
@ 2010-10-30 14:22 ` Vasiliy Kulikov
-1 siblings, 0 replies; 8+ messages in thread
From: Vasiliy Kulikov @ 2010-10-30 14:22 UTC (permalink / raw)
To: Linus Torvalds
Cc: kernel-janitors, Andrew Morton, Helge Deller, David Howells,
Hugh Dickins, linux-kernel
Structure shmid_ds is copied to userland with shm_unused{,2,3}
fields unitialized. It leads to leaking of contents of kernel stack
memory.
Cc: stable@kernel.org
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
---
Compile tested.
ipc/shm.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/ipc/shm.c b/ipc/shm.c
index fd658a1..7d3bb22 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -479,6 +479,7 @@ static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_
{
struct shmid_ds out;
+ memset(&out, 0, sizeof(out));
ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm);
out.shm_segsz = in->shm_segsz;
out.shm_atime = in->shm_atime;
--
1.7.0.4
^ permalink raw reply related [flat|nested] 8+ messages in thread
* [PATCH] ipc: shm: fix information leak to userland
@ 2010-10-30 14:22 ` Vasiliy Kulikov
0 siblings, 0 replies; 8+ messages in thread
From: Vasiliy Kulikov @ 2010-10-30 14:22 UTC (permalink / raw)
To: Linus Torvalds
Cc: kernel-janitors, Andrew Morton, Helge Deller, David Howells,
Hugh Dickins, linux-kernel
Structure shmid_ds is copied to userland with shm_unused{,2,3}
fields unitialized. It leads to leaking of contents of kernel stack
memory.
Cc: stable@kernel.org
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
---
Compile tested.
ipc/shm.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/ipc/shm.c b/ipc/shm.c
index fd658a1..7d3bb22 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -479,6 +479,7 @@ static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_
{
struct shmid_ds out;
+ memset(&out, 0, sizeof(out));
ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm);
out.shm_segsz = in->shm_segsz;
out.shm_atime = in->shm_atime;
--
1.7.0.4
^ permalink raw reply related [flat|nested] 8+ messages in thread
* Re: [PATCH] ipc: shm: fix information leak to userland
2010-10-30 15:00 ` Dan Rosenberg
@ 2010-10-30 15:40 ` Vasiliy Kulikov
0 siblings, 0 replies; 8+ messages in thread
From: Vasiliy Kulikov @ 2010-10-30 15:40 UTC (permalink / raw)
To: Dan Rosenberg; +Cc: linux-kernel
Hi Dan,
On Sat, Oct 30, 2010 at 11:00 -0400, Dan Rosenberg wrote:
> This one already got taken care of by Kees Cook:
>
> http://lkml.org/lkml/2010/10/6/486
After 25 days it is still not in linux-next. Also the second hunk is IMO odd
as all five fields are initialized:
case IPC_OLD:
{
struct shminfo out;
if(in->shmmax > INT_MAX)
out.shmmax = INT_MAX;
else
out.shmmax = (int)in->shmmax;
out.shmmin = in->shmmin;
out.shmmni = in->shmmni;
out.shmseg = in->shmseg;
out.shmall = in->shmall;
return copy_to_user(buf, &out, sizeof(out));
}
/* Obsolete, used only for backwards compatibility */
struct shminfo {
int shmmax;
int shmmin;
int shmmni;
int shmseg;
int shmall;
};
And I see no padding hole in shminfo.
> Thanks,
> Dan
>
> > Structure shmid_ds is copied to userland with shm_unused{,2,3}
> > fields unitialized. It leads to leaking of contents of kernel stack
> > memory.
> > Cc: stable@kernel.org
> > Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
> > Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
> > ---
> > Compile tested.
> > ipc/shm.c | 1 +
> > 1 files changed, 1 insertions(+), 0 deletions(-)
> > diff --git a/ipc/shm.c b/ipc/shm.c
> > index fd658a1..7d3bb22 100644
> > --- a/ipc/shm.c
> > +++ b/ipc/shm.c
> > @@ -479,6 +479,7 @@ static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_
> > {
> > struct shmid_ds out;
> >
> > + memset(&out, 0, sizeof(out));
> > ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm);
> > out.shm_segsz = in->shm_segsz;
> > out.shm_atime = in->shm_atime;
>
>
Thanks,
--
Vasiliy
^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [PATCH] ipc: shm: fix information leak to userland
[not found] <1288450677.3964.1.camel@dan>
@ 2010-10-30 15:00 ` Dan Rosenberg
2010-10-30 15:40 ` Vasiliy Kulikov
0 siblings, 1 reply; 8+ messages in thread
From: Dan Rosenberg @ 2010-10-30 15:00 UTC (permalink / raw)
To: segooon; +Cc: linux-kernel
This one already got taken care of by Kees Cook:
http://lkml.org/lkml/2010/10/6/486
Thanks,
Dan
> Structure shmid_ds is copied to userland with shm_unused{,2,3}
> fields unitialized. It leads to leaking of contents of kernel stack
> memory.
> Cc: stable@kernel.org
> Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
> Signed-off-by: Vasiliy Kulikov <segooon@gmail.com>
> ---
> Compile tested.
> ipc/shm.c | 1 +
> 1 files changed, 1 insertions(+), 0 deletions(-)
> diff --git a/ipc/shm.c b/ipc/shm.c
> index fd658a1..7d3bb22 100644
> --- a/ipc/shm.c
> +++ b/ipc/shm.c
> @@ -479,6 +479,7 @@ static inline unsigned long copy_shmid_to_user(void __user *buf, struct shmid64_
> {
> struct shmid_ds out;
>
> + memset(&out, 0, sizeof(out));
> ipc64_perm_to_ipc_perm(&in->shm_perm, &out.shm_perm);
> out.shm_segsz = in->shm_segsz;
> out.shm_atime = in->shm_atime;
^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2010-10-30 15:40 UTC | newest]
Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2010-10-30 9:04 [PATCH] ipc: shm: fix information leak to userland Vasiliy Kulikov
2010-10-30 9:04 ` Vasiliy Kulikov
2010-10-30 9:06 ` Al Viro
2010-10-30 9:06 ` Al Viro
2010-10-30 14:22 ` Vasiliy Kulikov
2010-10-30 14:22 ` Vasiliy Kulikov
[not found] <1288450677.3964.1.camel@dan>
2010-10-30 15:00 ` Dan Rosenberg
2010-10-30 15:40 ` Vasiliy Kulikov
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