| Message ID | 1303850123-15777-1-git-send-email-brad.figg@canonical.com |
|---|---|
| State | New |
| Headers | show |
On 04/26/2011 01:35 PM, Brad Figg wrote: > From: Timo Warns <Warns@pre-sense.de> > > BugLink: http://bugs.launchpad.net/bugs/771382 > > CVE-2011-1017 > > The kernel automatically evaluates partition tables of storage devices. > The code for evaluating LDM partitions (in fs/partitions/ldm.c) contains > a bug that causes a kernel oops on certain corrupted LDM partitions. > A kernel subsystem seems to crash, because, after the oops, the kernel no > longer recognizes newly connected storage devices. > > The patch validates the value of vblk_size. > > [akpm@linux-foundation.org: coding-style fixes] > Signed-off-by: Timo Warns <warns@pre-sense.de> > Cc: Eugene Teo <eugeneteo@kernel.sg> > Cc: Harvey Harrison <harvey.harrison@gmail.com> > Cc: Richard Russon <rich@flatcap.org> > Signed-off-by: Andrew Morton <akpm@linux-foundation.org> > Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> > > (backported from commit c340b1d640001c8c9ecff74f68fd90422ae2448a) > Signed-off-by: Brad Figg <brad.figg@canonical.com> looks good Acked-by: John Johansen <john.johansen@canonical.com> > --- > fs/partitions/ldm.c | 16 ++++++++++++---- > 1 files changed, 12 insertions(+), 4 deletions(-) > > diff --git a/fs/partitions/ldm.c b/fs/partitions/ldm.c > index 7ab1c11..c861f52 100644 > --- a/fs/partitions/ldm.c > +++ b/fs/partitions/ldm.c > @@ -1225,6 +1225,11 @@ static bool ldm_frag_add (const u8 *data, int size, struct list_head *frags) > > BUG_ON (!data || !frags); > > + if (size < 2 * VBLK_SIZE_HEAD) { > + ldm_error("Value of size is to small."); > + return false; > + } > + > group = BE32 (data + 0x08); > rec = BE16 (data + 0x0C); > num = BE16 (data + 0x0E); > @@ -1232,6 +1237,10 @@ static bool ldm_frag_add (const u8 *data, int size, struct list_head *frags) > ldm_error ("A VBLK claims to have %d parts.", num); > return false; > } > + if (rec >= num) { > + ldm_error("REC value (%d) exceeds NUM value (%d)", rec, num); > + return false; > + } > > list_for_each (item, frags) { > f = list_entry (item, struct frag, list); > @@ -1260,10 +1269,9 @@ found: > > f->map |= (1 << rec); > > - if (num > 0) { > - data += VBLK_SIZE_HEAD; > - size -= VBLK_SIZE_HEAD; > - } > + data += VBLK_SIZE_HEAD; > + size -= VBLK_SIZE_HEAD; > + > memcpy (f->data+rec*(size-VBLK_SIZE_HEAD)+VBLK_SIZE_HEAD, data, size); > > return true;
On 04/26/2011 10:35 PM, Brad Figg wrote: > From: Timo Warns <Warns@pre-sense.de> > > BugLink: http://bugs.launchpad.net/bugs/771382 > > CVE-2011-1017 > > The kernel automatically evaluates partition tables of storage devices. > The code for evaluating LDM partitions (in fs/partitions/ldm.c) contains > a bug that causes a kernel oops on certain corrupted LDM partitions. > A kernel subsystem seems to crash, because, after the oops, the kernel no > longer recognizes newly connected storage devices. > > The patch validates the value of vblk_size. > > [akpm@linux-foundation.org: coding-style fixes] > Signed-off-by: Timo Warns <warns@pre-sense.de> > Cc: Eugene Teo <eugeneteo@kernel.sg> > Cc: Harvey Harrison <harvey.harrison@gmail.com> > Cc: Richard Russon <rich@flatcap.org> > Signed-off-by: Andrew Morton <akpm@linux-foundation.org> > Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> > > (backported from commit c340b1d640001c8c9ecff74f68fd90422ae2448a) > Signed-off-by: Brad Figg <brad.figg@canonical.com> > --- > fs/partitions/ldm.c | 16 ++++++++++++---- > 1 files changed, 12 insertions(+), 4 deletions(-) > > diff --git a/fs/partitions/ldm.c b/fs/partitions/ldm.c > index 7ab1c11..c861f52 100644 > --- a/fs/partitions/ldm.c > +++ b/fs/partitions/ldm.c > @@ -1225,6 +1225,11 @@ static bool ldm_frag_add (const u8 *data, int size, struct list_head *frags) > > BUG_ON (!data || !frags); > > + if (size < 2 * VBLK_SIZE_HEAD) { > + ldm_error("Value of size is to small."); > + return false; > + } > + > group = BE32 (data + 0x08); > rec = BE16 (data + 0x0C); > num = BE16 (data + 0x0E); > @@ -1232,6 +1237,10 @@ static bool ldm_frag_add (const u8 *data, int size, struct list_head *frags) > ldm_error ("A VBLK claims to have %d parts.", num); > return false; > } > + if (rec >= num) { > + ldm_error("REC value (%d) exceeds NUM value (%d)", rec, num); > + return false; > + } > > list_for_each (item, frags) { > f = list_entry (item, struct frag, list); > @@ -1260,10 +1269,9 @@ found: > > f->map |= (1 << rec); > > - if (num > 0) { > - data += VBLK_SIZE_HEAD; > - size -= VBLK_SIZE_HEAD; > - } > + data += VBLK_SIZE_HEAD; > + size -= VBLK_SIZE_HEAD; > + > memcpy (f->data+rec*(size-VBLK_SIZE_HEAD)+VBLK_SIZE_HEAD, data, size); > > return true; Acked-by: Stefan Bader <stefan.bader@canonical.com>
Applied 'ldm: corrupted partition table can cause kernel oops, CVE-2011-1017' and 'fs/partitions/ldm.c: fix oops caused by corrupted partition table, CVE-2011-1017' rtg
diff --git a/fs/partitions/ldm.c b/fs/partitions/ldm.c index 7ab1c11..c861f52 100644 --- a/fs/partitions/ldm.c +++ b/fs/partitions/ldm.c @@ -1225,6 +1225,11 @@ static bool ldm_frag_add (const u8 *data, int size, struct list_head *frags) BUG_ON (!data || !frags); + if (size < 2 * VBLK_SIZE_HEAD) { + ldm_error("Value of size is to small."); + return false; + } + group = BE32 (data + 0x08); rec = BE16 (data + 0x0C); num = BE16 (data + 0x0E); @@ -1232,6 +1237,10 @@ static bool ldm_frag_add (const u8 *data, int size, struct list_head *frags) ldm_error ("A VBLK claims to have %d parts.", num); return false; } + if (rec >= num) { + ldm_error("REC value (%d) exceeds NUM value (%d)", rec, num); + return false; + } list_for_each (item, frags) { f = list_entry (item, struct frag, list); @@ -1260,10 +1269,9 @@ found: f->map |= (1 << rec); - if (num > 0) { - data += VBLK_SIZE_HEAD; - size -= VBLK_SIZE_HEAD; - } + data += VBLK_SIZE_HEAD; + size -= VBLK_SIZE_HEAD; + memcpy (f->data+rec*(size-VBLK_SIZE_HEAD)+VBLK_SIZE_HEAD, data, size); return true;