From: Eugene Teo <eugeneteo@kernel.sg> To: Dan Rosenberg <drosenberg@vsecurity.com> Cc: Dave Chinner <david@fromorbit.com>, aelder@sgi.com, xfs-masters@oss.sgi.com, xfs@oss.sgi.com, linux-kernel@vger.kernel.org, stable@kernel.org, security@kernel.org Subject: Re: [PATCH v2] xfs: prevent leaking uninitialized stack memory in FSGEOMETRY_V1 Date: Tue, 15 Feb 2011 07:39:53 +0800 [thread overview] Message-ID: <AANLkTim7zYvwFyVTEMFDyGBR8d0Ka9ruK+R_+s-Rf5Fa@mail.gmail.com> (raw) In-Reply-To: <1297691128.1857.4.camel@dan> On Mon, Feb 14, 2011 at 9:45 PM, Dan Rosenberg <drosenberg@vsecurity.com> wrote: > The FSGEOMETRY_V1 ioctl (and its compat equivalent) calls out to > xfs_fs_geometry() with a version number of 3. This code path does not > fill in the logsunit member of the passed xfs_fsop_geom_t, leading to > the leaking of four bytes of uninitialized stack data to potentially > unprivileged callers. > > v2 switches to memset() to avoid future issues if structure members > change, on suggestion of Dave Chinner. > > Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com> Reviewed-by: Eugene Teo <eugeneteo@kernel.org> > --- > fs/xfs/xfs_fsops.c | 3 +++ > 1 files changed, 3 insertions(+), 0 deletions(-) > > diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c > index cec89dd..85668ef 100644 > --- a/fs/xfs/xfs_fsops.c > +++ b/fs/xfs/xfs_fsops.c > @@ -53,6 +53,9 @@ xfs_fs_geometry( > xfs_fsop_geom_t *geo, > int new_version) > { > + > + memset(geo, 0, sizeof(*geo)); > + > geo->blocksize = mp->m_sb.sb_blocksize; > geo->rtextsize = mp->m_sb.sb_rextsize; > geo->agblocks = mp->m_sb.sb_agblocks; > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ >
WARNING: multiple messages have this Message-ID (diff)
From: Eugene Teo <eugeneteo@kernel.sg> To: Dan Rosenberg <drosenberg@vsecurity.com> Cc: security@kernel.org, linux-kernel@vger.kernel.org, xfs@oss.sgi.com, xfs-masters@oss.sgi.com, aelder@sgi.com, stable@kernel.org Subject: Re: [PATCH v2] xfs: prevent leaking uninitialized stack memory in FSGEOMETRY_V1 Date: Tue, 15 Feb 2011 07:39:53 +0800 [thread overview] Message-ID: <AANLkTim7zYvwFyVTEMFDyGBR8d0Ka9ruK+R_+s-Rf5Fa@mail.gmail.com> (raw) In-Reply-To: <1297691128.1857.4.camel@dan> On Mon, Feb 14, 2011 at 9:45 PM, Dan Rosenberg <drosenberg@vsecurity.com> wrote: > The FSGEOMETRY_V1 ioctl (and its compat equivalent) calls out to > xfs_fs_geometry() with a version number of 3. This code path does not > fill in the logsunit member of the passed xfs_fsop_geom_t, leading to > the leaking of four bytes of uninitialized stack data to potentially > unprivileged callers. > > v2 switches to memset() to avoid future issues if structure members > change, on suggestion of Dave Chinner. > > Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com> Reviewed-by: Eugene Teo <eugeneteo@kernel.org> > --- > fs/xfs/xfs_fsops.c | 3 +++ > 1 files changed, 3 insertions(+), 0 deletions(-) > > diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c > index cec89dd..85668ef 100644 > --- a/fs/xfs/xfs_fsops.c > +++ b/fs/xfs/xfs_fsops.c > @@ -53,6 +53,9 @@ xfs_fs_geometry( > xfs_fsop_geom_t *geo, > int new_version) > { > + > + memset(geo, 0, sizeof(*geo)); > + > geo->blocksize = mp->m_sb.sb_blocksize; > geo->rtextsize = mp->m_sb.sb_rextsize; > geo->agblocks = mp->m_sb.sb_agblocks; > > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs
next prev parent reply other threads:[~2011-02-14 23:39 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-02-10 14:25 [PATCH] xfs: prevent leaking uninitialized stack memory in FSGEOMETRY_V1 Dan Rosenberg 2011-02-10 14:25 ` Dan Rosenberg 2011-02-14 8:41 ` [Security] " Eugene Teo 2011-02-14 8:41 ` Eugene Teo 2011-02-14 11:46 ` Dave Chinner 2011-02-14 11:46 ` Dave Chinner 2011-02-14 13:45 ` [PATCH v2] " Dan Rosenberg 2011-02-14 13:45 ` Dan Rosenberg 2011-02-14 23:39 ` Eugene Teo [this message] 2011-02-14 23:39 ` Eugene Teo
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