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Date: Mon, 27 Sep 2010 16:25:05 -0400 (EDT)
From: Josh Bressers <bressers@...hat.com>
To: oss-security@...ts.openwall.com
Cc: Eugene Teo <eugeneteo@...nel.sg>,
        "Steven M. Christey" <coley@...us.mitre.org>
Subject: Re: CVE request: multiple kernel stack memory
 disclosures

Steve,

Can MITRE tackle this one. I don't have enough IDs for them all, and I'm
not sure of past precedence for putting some of these together.

Thanks.

-- 
    JB


----- "Dan Rosenberg" <dan.j.rosenberg@...il.com> wrote:

> I'd like to request CVEs for a large series of Linux kernel stack
> memory disclosure vulnerabilities, almost all of which have been
> fixed.  They are all examples of declaring various structs on the
> stack and copying them back to the user without filling in all the
> fields, leaking uninitialized stack memory.  Since there are a lot of
> issues here, I trust your judgment in deciding if they should each
> receive a unique ID or if they should be combined in some way.  I
> tried to break them up logically to make it easier.
> 
> ---
> 
> The first batch of issues occurred in the TIOCGICOUNT device ioctls
> of
> several device drivers.  While several of the issues were fixed on an
> individual basis, Alan Cox fixed it for good by creating a new
> handler.  Since these issues are essentially identical and were fixed
> all at once, I think it might make sense to have them under a single
> CVE.  Note that the final listed item in drivers/net/usb/hso.c was
> already assigned CVE-2010-3298.
> 
> "The TIOCGICOUNT device ioctl in mos7720.c, mos7840.c, serial_core.c,
> hso.c, amiserial.c, and nozomi.c allows unprivileged users to read
> uninitialized stack memory, because the 'reserved' member of the
> serial_icounter_struct struct declared on the stack is not altered or
> zeroed before being copied back to the user."
> 
> 
> Alan Cox's fix:
> http://lkml.org/lkml/2010/9/16/294
> 
> drivers/usb/serial/mos*
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=a0846f1868b11cd827bdfeaf4527d8b1b1c0b098
> 
> drivers/serial/serial_core.c
> http://userweb.kernel.org/~akpm/mmotm/broken-out/drivers-serial-serial_corec-prevent-reading-uninitialized-stack-memory.patch
> 
> drivers/char/amiserial.c
> http://userweb.kernel.org/~akpm/mmotm/broken-out/drivers-char-amiserialc-prevent-reading-uninitialized-stack-memory.patch
> 
> drivers/char/nozomi.c
> http://userweb.kernel.org/~akpm/mmotm/broken-out/drivers-char-nozomic-prevent-reading-uninitialized-stack-memory.patch
> 
> drivers/net/usb/hso.c (CVE-2010-3298)
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7011e660938fc44ed86319c18a5954e95a82ab3e
> 
> ---
> 
> The next two issues both occurred in the FBIOGET_VBLANK device ioctl:
> 
> "The FBIOGET_VBLANK device ioctl in sis_main.c and ivtvfb.c allows
> unprivileged users to read 16 bytes of uninitialized stack memory,
> because the 'reserved' member of the fb_vblank struct declared on the
> stack is not altered or zeroed before being copied back to the user."
> 
> drivers/video/sis/sis_main.c
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=fd02db9de73faebc51240619c7c7f99bee9f65c7
> 
> drivers/media/video/ivtv/ivtvfb.c
> lkml.org/lkml/2010/9/15/393
> 
> ---
> 
> The following issues occured in miscellaneous device ioctls in a
> variety of drivers.  Note the final two items listed have already
> been
> assigned CVE-2010-3296 and CVE-2010-3297 - I include them only for
> reference.
> 
> 
> sound/pci/rme9652/hdsp*.c
> http://marc.info/?l=linux-kernel&m=128542726922720&w=2
> 
> "The SNDRV_HDSP_IOCTL_GET_CONFIG_INFO and
> SNDRV_HDSP_IOCTL_GET_CONFIG_INFO ioctls in hdspm.c and hdsp.c allow
> unprivileged users to read uninitialized kernel stack memory, because
> several fields of the hdsp{m}_config_info structs declared on the
> stack are not altered or zeroed before being copied back to the
> user."
> 
> 
> drivers/video/via/ioctl.c
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b4aaa78f4c2f9cde2f335b14f4ca30b01f9651ca
> 
> "The VIAFB_GET_INFO device ioctl allows unprivileged users to read
> 246
> bytes of uninitialized stack memory, because the 'reserved' member of
> the viafb_ioctl_info struct declared on the stack is not altered or
> zeroed before being copied back to the user."
> 
> 
> drivers/net/cxgb3/cxgb3_main.c (CVE-2010-3296)
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=49c37c0334a9b85d30ab3d6b5d1acb05ef2ef6de
> 
> "The CHELSIO_GET_QSET_NUM device ioctl allows unprivileged users to
> read 4 bytes of uninitialized stack memory, because the 'addr' member
> of the ch_reg struct declared on the stack in cxgb_extension_ioctl()
> is not altered or zeroed before being copied back to the user."  This
> issue was assigned CVE-2010-3296.
> 
> 
> drivers/net/eql.c (CVE-2010-3297)
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=44467187dc22fdd33a1a06ea0ba86ce20be3fe3c
> 
> "The EQL_GETMASTRCFG device ioctl allows unprivileged users to read
> 16
> bytes of uninitialized stack memory, because the 'master_name' member
> of the master_config_t struct declared on the stack in
> eql_g_master_cfg() is not altered or zeroed before being copied back
> to the user."  This issue was assigned CVE-2010-3297.
> 
> ---
> 
> The final identified leak is in the sys_semctl system call, which I
> would say is more serious since it is not driver-specific:
> 
> ipc/sem.c
> http://www.spinics.net/lists/mm-commits/msg80234.html
> 
> "The semctl syscall has several code paths that lead to the leakage
> of
> uninitialized kernel stack memory (namely the IPC_INFO, SEM_INFO,
> IPC_STAT, and SEM_STAT commands) during the use of the older,
> obsolete
> version of the semid_ds struct.  The copy_semid_to_user() function
> declares a semid_ds struct on the stack and copies it back to the
> user
> without initializing or zeroing the 'sem_base', 'sem_pending',
> 'sem_pending_last', and 'undo' pointers, allowing the leakage of 16
> bytes of kernel stack memory.  The code is still reachable on 32-bit
> systems - when calling semctl() newer glibc's automatically OR the
> IPC
> command with the IPC_64 flag, but invoking the syscall directly
> allows
> users to use the older versions of the struct."
> 
> ---
> 
> Let me know if you have any questions or need any clarification on
> any
> of these issues.
> 
> Regards,
> Dan

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