1. 05 9月, 2017 10 次提交
  2. 30 8月, 2017 8 次提交
  3. 26 8月, 2017 1 次提交
    • J
      futex: Remove duplicated code and fix undefined behaviour · 30d6e0a4
      Jiri Slaby 提交于
      There is code duplicated over all architecture's headers for
      futex_atomic_op_inuser. Namely op decoding, access_ok check for uaddr,
      and comparison of the result.
      
      Remove this duplication and leave up to the arches only the needed
      assembly which is now in arch_futex_atomic_op_inuser.
      
      This effectively distributes the Will Deacon's arm64 fix for undefined
      behaviour reported by UBSAN to all architectures. The fix was done in
      commit 5f16a046 (arm64: futex: Fix undefined behaviour with
      FUTEX_OP_OPARG_SHIFT usage). Look there for an example dump.
      
      And as suggested by Thomas, check for negative oparg too, because it was
      also reported to cause undefined behaviour report.
      
      Note that s390 removed access_ok check in d12a2970 ("s390/uaccess:
      remove pointless access_ok() checks") as access_ok there returns true.
      We introduce it back to the helper for the sake of simplicity (it gets
      optimized away anyway).
      Signed-off-by: NJiri Slaby <jslaby@suse.cz>
      Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
      Acked-by: NRussell King <rmk+kernel@armlinux.org.uk>
      Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
      Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com> [s390]
      Acked-by: Chris Metcalf <cmetcalf@mellanox.com> [for tile]
      Reviewed-by: NDarren Hart (VMware) <dvhart@infradead.org>
      Reviewed-by: Will Deacon <will.deacon@arm.com> [core/arm64]
      Cc: linux-mips@linux-mips.org
      Cc: Rich Felker <dalias@libc.org>
      Cc: linux-ia64@vger.kernel.org
      Cc: linux-sh@vger.kernel.org
      Cc: peterz@infradead.org
      Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
      Cc: Max Filippov <jcmvbkbc@gmail.com>
      Cc: Paul Mackerras <paulus@samba.org>
      Cc: sparclinux@vger.kernel.org
      Cc: Jonas Bonn <jonas@southpole.se>
      Cc: linux-s390@vger.kernel.org
      Cc: linux-arch@vger.kernel.org
      Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
      Cc: linux-hexagon@vger.kernel.org
      Cc: Helge Deller <deller@gmx.de>
      Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Matt Turner <mattst88@gmail.com>
      Cc: linux-snps-arc@lists.infradead.org
      Cc: Fenghua Yu <fenghua.yu@intel.com>
      Cc: Arnd Bergmann <arnd@arndb.de>
      Cc: linux-xtensa@linux-xtensa.org
      Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
      Cc: openrisc@lists.librecores.org
      Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
      Cc: Stafford Horne <shorne@gmail.com>
      Cc: linux-arm-kernel@lists.infradead.org
      Cc: Richard Henderson <rth@twiddle.net>
      Cc: Chris Zankel <chris@zankel.net>
      Cc: Michal Simek <monstr@monstr.eu>
      Cc: Tony Luck <tony.luck@intel.com>
      Cc: linux-parisc@vger.kernel.org
      Cc: Vineet Gupta <vgupta@synopsys.com>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Richard Kuo <rkuo@codeaurora.org>
      Cc: linux-alpha@vger.kernel.org
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Cc: linuxppc-dev@lists.ozlabs.org
      Cc: "David S. Miller" <davem@davemloft.net>
      Link: http://lkml.kernel.org/r/20170824073105.3901-1-jslaby@suse.cz
      30d6e0a4
  4. 17 8月, 2017 1 次提交
  5. 17 7月, 2017 1 次提交
  6. 21 6月, 2017 1 次提交
    • D
      net: introduce SO_PEERGROUPS getsockopt · 28b5ba2a
      David Herrmann 提交于
      This adds the new getsockopt(2) option SO_PEERGROUPS on SOL_SOCKET to
      retrieve the auxiliary groups of the remote peer. It is designed to
      naturally extend SO_PEERCRED. That is, the underlying data is from the
      same credentials. Regarding its syntax, it is based on SO_PEERSEC. That
      is, if the provided buffer is too small, ERANGE is returned and @optlen
      is updated. Otherwise, the information is copied, @optlen is set to the
      actual size, and 0 is returned.
      
      While SO_PEERCRED (and thus `struct ucred') already returns the primary
      group, it lacks the auxiliary group vector. However, nearly all access
      controls (including kernel side VFS and SYSVIPC, but also user-space
      polkit, DBus, ...) consider the entire set of groups, rather than just
      the primary group. But this is currently not possible with pure
      SO_PEERCRED. Instead, user-space has to work around this and query the
      system database for the auxiliary groups of a UID retrieved via
      SO_PEERCRED.
      
      Unfortunately, there is no race-free way to query the auxiliary groups
      of the PID/UID retrieved via SO_PEERCRED. Hence, the current user-space
      solution is to use getgrouplist(3p), which itself falls back to NSS and
      whatever is configured in nsswitch.conf(3). This effectively checks
      which groups we *would* assign to the user if it logged in *now*. On
      normal systems it is as easy as reading /etc/group, but with NSS it can
      resort to quering network databases (eg., LDAP), using IPC or network
      communication.
      
      Long story short: Whenever we want to use auxiliary groups for access
      checks on IPC, we need further IPC to talk to the user/group databases,
      rather than just relying on SO_PEERCRED and the incoming socket. This
      is unfortunate, and might even result in dead-locks if the database
      query uses the same IPC as the original request.
      
      So far, those recursions / dead-locks have been avoided by using
      primitive IPC for all crucial NSS modules. However, we want to avoid
      re-inventing the wheel for each NSS module that might be involved in
      user/group queries. Hence, we would preferably make DBus (and other IPC
      that supports access-management based on groups) work without resorting
      to the user/group database. This new SO_PEERGROUPS ioctl would allow us
      to make dbus-daemon work without ever calling into NSS.
      
      Cc: Michal Sekletar <msekleta@redhat.com>
      Cc: Simon McVittie <simon.mcvittie@collabora.co.uk>
      Reviewed-by: NTom Gundersen <teg@jklm.no>
      Signed-off-by: NDavid Herrmann <dh.herrmann@gmail.com>
      Signed-off-by: NDavid S. Miller <davem@davemloft.net>
      28b5ba2a
  7. 09 6月, 2017 1 次提交
    • A
      tty: add TIOCGPTPEER ioctl · 54ebbfb1
      Aleksa Sarai 提交于
      When opening the slave end of a PTY, it is not possible for userspace to
      safely ensure that /dev/pts/$num is actually a slave (in cases where the
      mount namespace in which devpts was mounted is controlled by an
      untrusted process). In addition, there are several unresolvable
      race conditions if userspace were to attempt to detect attacks through
      stat(2) and other similar methods [in addition it is not clear how
      userspace could detect attacks involving FUSE].
      
      Resolve this by providing an interface for userpace to safely open the
      "peer" end of a PTY file descriptor by using the dentry cached by
      devpts. Since it is not possible to have an open master PTY without
      having its slave exposed in /dev/pts this interface is safe. This
      interface currently does not provide a way to get the master pty (since
      it is not clear whether such an interface is safe or even useful).
      
      Cc: Christian Brauner <christian.brauner@ubuntu.com>
      Cc: Valentin Rothberg <vrothberg@suse.com>
      Signed-off-by: NAleksa Sarai <asarai@suse.de>
      Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      54ebbfb1
  8. 28 5月, 2017 4 次提交
  9. 22 5月, 2017 3 次提交
  10. 16 5月, 2017 1 次提交
  11. 10 5月, 2017 1 次提交
    • N
      uapi: export all headers under uapi directories · fcc8487d
      Nicolas Dichtel 提交于
      Regularly, when a new header is created in include/uapi/, the developer
      forgets to add it in the corresponding Kbuild file. This error is usually
      detected after the release is out.
      
      In fact, all headers under uapi directories should be exported, thus it's
      useless to have an exhaustive list.
      
      After this patch, the following files, which were not exported, are now
      exported (with make headers_install_all):
      asm-arc/kvm_para.h
      asm-arc/ucontext.h
      asm-blackfin/shmparam.h
      asm-blackfin/ucontext.h
      asm-c6x/shmparam.h
      asm-c6x/ucontext.h
      asm-cris/kvm_para.h
      asm-h8300/shmparam.h
      asm-h8300/ucontext.h
      asm-hexagon/shmparam.h
      asm-m32r/kvm_para.h
      asm-m68k/kvm_para.h
      asm-m68k/shmparam.h
      asm-metag/kvm_para.h
      asm-metag/shmparam.h
      asm-metag/ucontext.h
      asm-mips/hwcap.h
      asm-mips/reg.h
      asm-mips/ucontext.h
      asm-nios2/kvm_para.h
      asm-nios2/ucontext.h
      asm-openrisc/shmparam.h
      asm-parisc/kvm_para.h
      asm-powerpc/perf_regs.h
      asm-sh/kvm_para.h
      asm-sh/ucontext.h
      asm-tile/shmparam.h
      asm-unicore32/shmparam.h
      asm-unicore32/ucontext.h
      asm-x86/hwcap2.h
      asm-xtensa/kvm_para.h
      drm/armada_drm.h
      drm/etnaviv_drm.h
      drm/vgem_drm.h
      linux/aspeed-lpc-ctrl.h
      linux/auto_dev-ioctl.h
      linux/bcache.h
      linux/btrfs_tree.h
      linux/can/vxcan.h
      linux/cifs/cifs_mount.h
      linux/coresight-stm.h
      linux/cryptouser.h
      linux/fsmap.h
      linux/genwqe/genwqe_card.h
      linux/hash_info.h
      linux/kcm.h
      linux/kcov.h
      linux/kfd_ioctl.h
      linux/lightnvm.h
      linux/module.h
      linux/nbd-netlink.h
      linux/nilfs2_api.h
      linux/nilfs2_ondisk.h
      linux/nsfs.h
      linux/pr.h
      linux/qrtr.h
      linux/rpmsg.h
      linux/sched/types.h
      linux/sed-opal.h
      linux/smc.h
      linux/smc_diag.h
      linux/stm.h
      linux/switchtec_ioctl.h
      linux/vfio_ccw.h
      linux/wil6210_uapi.h
      rdma/bnxt_re-abi.h
      
      Note that I have removed from this list the files which are generated in every
      exported directories (like .install or .install.cmd).
      
      Thanks to Julien Floret <julien.floret@6wind.com> for the tip to get all
      subdirs with a pure makefile command.
      
      For the record, note that exported files for asm directories are a mix of
      files listed by:
       - include/uapi/asm-generic/Kbuild.asm;
       - arch/<arch>/include/uapi/asm/Kbuild;
       - arch/<arch>/include/asm/Kbuild.
      Signed-off-by: NNicolas Dichtel <nicolas.dichtel@6wind.com>
      Acked-by: NDaniel Vetter <daniel.vetter@ffwll.ch>
      Acked-by: NRussell King <rmk+kernel@armlinux.org.uk>
      Acked-by: NMark Salter <msalter@redhat.com>
      Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
      Signed-off-by: NMasahiro Yamada <yamada.masahiro@socionext.com>
      fcc8487d
  12. 03 5月, 2017 3 次提交
  13. 27 4月, 2017 1 次提交
  14. 15 4月, 2017 1 次提交
  15. 08 4月, 2017 1 次提交
  16. 06 4月, 2017 1 次提交
  17. 03 4月, 2017 1 次提交