{"id":"CVE-2022-50647","summary":"RISC-V: Make port I/O string accessors actually work","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nRISC-V: Make port I/O string accessors actually work\n\nFix port I/O string accessors such as `insb', `outsb', etc. which use\nthe physical PCI port I/O address rather than the corresponding memory\nmapping to get at the requested location, which in turn breaks at least\naccesses made by our parport driver to a PCIe parallel port such as:\n\nPCI parallel port detected: 1415:c118, I/O at 0x1000(0x1008), IRQ 20\nparport0: PC-style at 0x1000 (0x1008), irq 20, using FIFO [PCSPP,TRISTATE,COMPAT,EPP,ECP]\n\ncausing a memory access fault:\n\nUnable to handle kernel access to user memory without uaccess routines at virtual address 0000000000001008\nOops [#1]\nModules linked in:\nCPU: 1 PID: 350 Comm: cat Not tainted 6.0.0-rc2-00283-g10d4879f9ef0-dirty #23\nHardware name: SiFive HiFive Unmatched A00 (DT)\nepc : parport_pc_fifo_write_block_pio+0x266/0x416\n ra : parport_pc_fifo_write_block_pio+0xb4/0x416\nepc : ffffffff80542c3e ra : ffffffff80542a8c sp : ffffffd88899fc60\n gp : ffffffff80fa2700 tp : ffffffd882b1e900 t0 : ffffffd883d0b000\n t1 : ffffffffff000002 t2 : 4646393043330a38 s0 : ffffffd88899fcf0\n s1 : 0000000000001000 a0 : 0000000000000010 a1 : 0000000000000000\n a2 : ffffffd883d0a010 a3 : 0000000000000023 a4 : 00000000ffff8fbb\n a5 : ffffffd883d0a001 a6 : 0000000100000000 a7 : ffffffc800000000\n s2 : ffffffffff000002 s3 : ffffffff80d28880 s4 : ffffffff80fa1f50\n s5 : 0000000000001008 s6 : 0000000000000008 s7 : ffffffd883d0a000\n s8 : 0004000000000000 s9 : ffffffff80dc1d80 s10: ffffffd8807e4000\n s11: 0000000000000000 t3 : 00000000000000ff t4 : 393044410a303930\n t5 : 0000000000001000 t6 : 0000000000040000\nstatus: 0000000200000120 badaddr: 0000000000001008 cause: 000000000000000f\n[\u003cffffffff80543212\u003e] parport_pc_compat_write_block_pio+0xfe/0x200\n[\u003cffffffff8053bbc0\u003e] parport_write+0x46/0xf8\n[\u003cffffffff8050530e\u003e] lp_write+0x158/0x2d2\n[\u003cffffffff80185716\u003e] vfs_write+0x8e/0x2c2\n[\u003cffffffff80185a74\u003e] ksys_write+0x52/0xc2\n[\u003cffffffff80185af2\u003e] sys_write+0xe/0x16\n[\u003cffffffff80003770\u003e] ret_from_syscall+0x0/0x2\n---[ end trace 0000000000000000 ]---\n\nFor simplicity address the problem by adding PCI_IOBASE to the physical\naddress requested in the respective wrapper macros only, observing that\nthe raw accessors such as `__insb', `__outsb', etc. are not supposed to\nbe used other than by said macros.  Remove the cast to `long' that is no\nlonger needed on `addr' now that it is used as an offset from PCI_IOBASE\nand add parentheses around `addr' needed for predictable evaluation in\nmacro expansion.  No need to make said adjustments in separate changes\ngiven that current code is gravely broken and does not ever work.","modified":"2026-04-02T08:28:40.562599Z","published":"2025-12-09T00:00:21.501Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50647.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/140b2b92dbefffa7f4f7211a1fd399a6e79e71c4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1acee4616930fc07265cb8e539753a8062daa8e0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2c60db6869fe5213471fcf4fe5704dc29da8b5ee"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2ce9fab94b8db61f014e43ddf80dd1524ae6dff4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9cc205e3c17d5716da7ebb7fa0c985555e95d009"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dc235db7b79a352d07d62e8757ad856dbf1564c1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50647.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-50647"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"fab957c11efe2f405e08b9f0d080524bc2631428"},{"fixed":"2c60db6869fe5213471fcf4fe5704dc29da8b5ee"},{"fixed":"2ce9fab94b8db61f014e43ddf80dd1524ae6dff4"},{"fixed":"dc235db7b79a352d07d62e8757ad856dbf1564c1"},{"fixed":"140b2b92dbefffa7f4f7211a1fd399a6e79e71c4"},{"fixed":"1acee4616930fc07265cb8e539753a8062daa8e0"},{"fixed":"9cc205e3c17d5716da7ebb7fa0c985555e95d009"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50647.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.15.0"},{"fixed":"5.4.220"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.150"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.75"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"5.19.17"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.20.0"},{"fixed":"6.0.3"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50647.json"}}],"schema_version":"1.7.5"}