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34aa3d5b84
commit 7aefa6237cfe4a6fcf06a8656eee988b36f8fefc upstream. Empty device names cannot be added to sysfs and crash with: kobject: (00000000f9de3792): attempted to be registered with empty name! WARNING: CPU: 1 PID: 10856 at lib/kobject.c:234 kobject_add_internal+0x7ac/0x9a0 lib/kobject.c:234 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 10856 Comm: syz-executor459 Not tainted 5.6.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x197/0x210 lib/dump_stack.c:118 panic+0x2e3/0x75c kernel/panic.c:221 __warn.cold+0x2f/0x3e kernel/panic.c:582 report_bug+0x289/0x300 lib/bug.c:195 fixup_bug arch/x86/kernel/traps.c:174 [inline] fixup_bug arch/x86/kernel/traps.c:169 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:267 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:286 invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027 RIP: 0010:kobject_add_internal+0x7ac/0x9a0 lib/kobject.c:234 Code: 7a ca ca f9 e9 f0 f8 ff ff 4c 89 f7 e8 cd ca ca f9 e9 95 f9 ff ff e8 13 25 8c f9 4c 89 e6 48 c7 c7 a0 08 1a 89 e8 a3 76 5c f9 <0f> 0b 41 bd ea ff ff ff e9 52 ff ff ff e8 f2 24 8c f9 0f 0b e8 eb RSP: 0018:ffffc90002006eb0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff815eae46 RDI: fffff52000400dc8 RBP: ffffc90002006f08 R08: ffff8880972ac500 R09: ffffed1015d26659 R10: ffffed1015d26658 R11: ffff8880ae9332c7 R12: ffff888093034668 R13: 0000000000000000 R14: ffff8880a69d7600 R15: 0000000000000001 kobject_add_varg lib/kobject.c:390 [inline] kobject_add+0x150/0x1c0 lib/kobject.c:442 device_add+0x3be/0x1d00 drivers/base/core.c:2412 ib_register_device drivers/infiniband/core/device.c:1371 [inline] ib_register_device+0x93e/0xe40 drivers/infiniband/core/device.c:1343 rxe_register_device+0x52e/0x655 drivers/infiniband/sw/rxe/rxe_verbs.c:1231 rxe_add+0x122b/0x1661 drivers/infiniband/sw/rxe/rxe.c:302 rxe_net_add+0x91/0xf0 drivers/infiniband/sw/rxe/rxe_net.c:539 rxe_newlink+0x39/0x90 drivers/infiniband/sw/rxe/rxe.c:318 nldev_newlink+0x28a/0x430 drivers/infiniband/core/nldev.c:1538 rdma_nl_rcv_msg drivers/infiniband/core/netlink.c:195 [inline] rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline] rdma_nl_rcv+0x5d9/0x980 drivers/infiniband/core/netlink.c:259 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x59e/0x7e0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:672 ____sys_sendmsg+0x753/0x880 net/socket.c:2343 ___sys_sendmsg+0x100/0x170 net/socket.c:2397 __sys_sendmsg+0x105/0x1d0 net/socket.c:2430 __do_sys_sendmsg net/socket.c:2439 [inline] __se_sys_sendmsg net/socket.c:2437 [inline] __x64_sys_sendmsg+0x78/0xb0 net/socket.c:2437 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe Prevent empty names when checking the name provided from userspace during newlink and rename. Fixes: |
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.