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This patch avoids that the following call trace is reported when using the iSER target driver with CONFIG_HARDENED_USERCOPY=y in the kernel config: usercopy: Kernel memory exposure attempt detected from SLUB object 'scst_cmd' (offset 200, size 48)! ------------[ cut here ]------------ kernel BUG at /build/linux-Sci2oS/linux-4.16.16/mm/usercopy.c:100! invalid opcode: 0000 [#1] SMP PTI CPU: 10 PID: 6684 Comm: iscsi-scstd Tainted: P O 4.16.0-0.bpo.2-amd64 #1 Debian 4.16.16-2~bpo9+1 Hardware name: Supermicro Super Server/X10SRH-CF, BIOS 2.0b 04/14/2017 RIP: 0010:usercopy_abort+0x69/0x80 Call Trace: __check_heap_object+0xee/0x120 __check_object_size+0xb8/0x1a0 isert_read+0x82/0x2f0 [isert_scst] vfs_read+0x91/0x130 SyS_read+0x52/0xc0 ? SyS_fcntl+0x78/0xa0 do_syscall_64+0x6c/0x130 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 Reported-by: Carsten Aulbert <carsten.aulbert@aei.mpg.de> git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@7426 d57e44dd-8a1f-0410-8b47-8ef2f437770f
Overview ======== This is the SCST development repository. It contains not a single project SCST as one can think, but a number of them, which are divided as the following: 1. SCST core in scst/ subdirectory 2. Administration utility for SCST core scstadmin in scstadmin/ 3. Target drivers in own subdirectories qla2x00t/, iscsi-scst/, etc. 4. User space programs in usr/ subdirectory, like fileio_tgt. 5. Some various docs in doc/ subdirectory. Those subprojects are in most cases independent from each other, although some of them depend from the SCST core. They put in the single repository only to simplify their development, they are released independently. Thus, use "make all" only if you really need to build everything. Otherwise build only what you need, like for iSCSI-SCST: make scst scst_install iscsi iscsi_install For more information about each subproject see their README files. QLogic target driver ==================== QLogic target driver qla2x00t is the old driver, forked from qla2xxx several years ago. It is very stable, well tested and actively used in many production setups. There is also new driver, maintained by QLogic, which, among other, supports 32G FC, see http://scst.sourceforge.net/target_qla2x00t.html. You can find the latest version of it in git://git.qlogic.com/scst-qla2xxx.git. To integrate it into the SCST build tree you need to clone the QLogic git tree in a subdirectory of this directory (SCST root tree) with name qla2x00t_git (or create a symlink with this name pointing to any other location in your system). Now common and QLA specific root Makefile targets "magically" start working with the new driver. Then follow instructions in the git's README. In presence of qla2x00t_git subdirectory you can still build the qla2x00t using qla_old* root Makefile targets. Vladislav Bolkhovitin <vst@vlnb.net>, http://scst.sourceforge.net