CVE-2023-53525

*** Pendiente de traducción *** In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> RDMA/cma: Allow UD qp_type to join multicast only<br /> <br /> As for multicast:<br /> - The SIDR is the only mode that makes sense;<br /> - Besides PS_UDP, other port spaces like PS_IB is also allowed, as it is<br /> UD compatible. In this case qkey also needs to be set [1].<br /> <br /> This patch allows only UD qp_type to join multicast, and set qkey to<br /> default if it&amp;#39;s not set, to fix an uninit-value error: the ib-&gt;rec.qkey<br /> field is accessed without being initialized.<br /> <br /> =====================================================<br /> BUG: KMSAN: uninit-value in cma_set_qkey drivers/infiniband/core/cma.c:510 [inline]<br /> BUG: KMSAN: uninit-value in cma_make_mc_event+0xb73/0xe00 drivers/infiniband/core/cma.c:4570<br /> cma_set_qkey drivers/infiniband/core/cma.c:510 [inline]<br /> cma_make_mc_event+0xb73/0xe00 drivers/infiniband/core/cma.c:4570<br /> cma_iboe_join_multicast drivers/infiniband/core/cma.c:4782 [inline]<br /> rdma_join_multicast+0x2b83/0x30a0 drivers/infiniband/core/cma.c:4814<br /> ucma_process_join+0xa76/0xf60 drivers/infiniband/core/ucma.c:1479<br /> ucma_join_multicast+0x1e3/0x250 drivers/infiniband/core/ucma.c:1546<br /> ucma_write+0x639/0x6d0 drivers/infiniband/core/ucma.c:1732<br /> vfs_write+0x8ce/0x2030 fs/read_write.c:588<br /> ksys_write+0x28c/0x520 fs/read_write.c:643<br /> __do_sys_write fs/read_write.c:655 [inline]<br /> __se_sys_write fs/read_write.c:652 [inline]<br /> __ia32_sys_write+0xdb/0x120 fs/read_write.c:652<br /> do_syscall_32_irqs_on arch/x86/entry/common.c:114 [inline]<br /> __do_fast_syscall_32+0x96/0xf0 arch/x86/entry/common.c:180<br /> do_fast_syscall_32+0x34/0x70 arch/x86/entry/common.c:205<br /> do_SYSENTER_32+0x1b/0x20 arch/x86/entry/common.c:248<br /> entry_SYSENTER_compat_after_hwframe+0x4d/0x5c<br /> <br /> Local variable ib.i created at:<br /> cma_iboe_join_multicast drivers/infiniband/core/cma.c:4737 [inline]<br /> rdma_join_multicast+0x586/0x30a0 drivers/infiniband/core/cma.c:4814<br /> ucma_process_join+0xa76/0xf60 drivers/infiniband/core/ucma.c:1479<br /> <br /> CPU: 0 PID: 29874 Comm: syz-executor.3 Not tainted 5.16.0-rc3-syzkaller #0<br /> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011<br /> =====================================================<br /> <br /> [1] https://lore.kernel.org/linux-rdma/20220117183832.GD84788@nvidia.com/