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Finn Thain 2cb86d8480 nubus: Partially revert proc_create_single_data() conversion 
commit 0e96647cff upstream.

The conversion to proc_create_single_data() introduced a regression
whereby reading a file in /proc/bus/nubus results in a seg fault:

    # grep -r . /proc/bus/nubus/e/
    Data read fault at 0x00000020 in Super Data (pc=0x1074c2)
    BAD KERNEL BUSERR
    Oops: 00000000
    Modules linked in:
    PC: [<001074c2>] PDE_DATA+0xc/0x16
    SR: 2010  SP: 38284958  a2: 01152370
    d0: 00000001    d1: 01013000    d2: 01002790    d3: 00000000
    d4: 00000001    d5: 0008ce2e    a0: 00000000    a1: 00222a40
    Process grep (pid: 45, task=142f8727)
    Frame format=B ssw=074d isc=2008 isb=4e5e daddr=00000020 dobuf=01199e70
    baddr=001074c8 dibuf=ffffffff ver=f
    Stack from 01199e48:
	    01199e70 00222a58 01002790 00000000 011a3000 01199eb0 015000c0 00000000
	    00000000 01199ec0 01199ec0 000d551a 011a3000 00000001 00000000 00018000
	    d003f000 00000003 00000001 0002800d 01052840 01199fa8 c01f8000 00000000
	    00000029 0b532b80 00000000 00000000 00000029 0b532b80 01199ee4 00103640
	    011198c0 d003f000 00018000 01199fa8 00000000 011198c0 00000000 01199f4c
	    000b3344 011198c0 d003f000 00018000 01199fa8 00000000 00018000 011198c0
    Call Trace: [<00222a58>] nubus_proc_rsrc_show+0x18/0xa0
     [<000d551a>] seq_read+0xc4/0x510
     [<00018000>] fp_fcos+0x2/0x82
     [<0002800d>] __sys_setreuid+0x115/0x1c6
     [<00103640>] proc_reg_read+0x5c/0xb0
     [<00018000>] fp_fcos+0x2/0x82
     [<000b3344>] __vfs_read+0x2c/0x13c
     [<00018000>] fp_fcos+0x2/0x82
     [<00018000>] fp_fcos+0x2/0x82
     [<000b8aa2>] sys_statx+0x60/0x7e
     [<000b34b6>] vfs_read+0x62/0x12a
     [<00018000>] fp_fcos+0x2/0x82
     [<00018000>] fp_fcos+0x2/0x82
     [<000b39c2>] ksys_read+0x48/0xbe
     [<00018000>] fp_fcos+0x2/0x82
     [<000b3a4e>] sys_read+0x16/0x1a
     [<00018000>] fp_fcos+0x2/0x82
     [<00002b84>] syscall+0x8/0xc
     [<00018000>] fp_fcos+0x2/0x82
     [<0000c016>] not_ext+0xa/0x18
    Code: 4e5e 4e75 4e56 0000 206e 0008 2068 ffe8 <2068> 0020 2008 4e5e 4e75 4e56 0000 2f0b 206e 0008 2068 0004 2668 0020 206b ffe8
    Disabling lock debugging due to kernel taint

    Segmentation fault

The proc_create_single_data() conversion does not work because
single_open(file, nubus_proc_rsrc_show, PDE_DATA(inode)) is not
equivalent to the original code.

Fixes: 3f3942aca6 ("proc: introduce proc_create_single{,_data}")
Cc: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org # 5.6+
Signed-off-by: Finn Thain <fthain@linux-m68k.org>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/d4e2a586e793cc8d9442595684ab8a077c0fe726.1678783919.git.fthain@linux-m68k.org
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2023-08-20 15:24:11 +08:00
arch parisc: Delete redundant register definitions in <asm/assembly.h> 2023-08-20 15:24:11 +08:00
block blk-iocost: avoid 64-bit division in ioc_timer_fn 2023-08-20 15:21:23 +08:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2023-04-19 17:50:34 +08:00
crypto KEYS: asymmetric: Copy sig and digest in public_key_verify_signature() 2023-08-20 15:21:12 +08:00
Documentation Remove DECnet support from kernel 2023-08-20 15:23:42 +08:00
drivers nubus: Partially revert proc_create_single_data() conversion 2023-08-20 15:24:11 +08:00
fs nilfs2: prevent general protection fault in nilfs_clear_dirty_page() 2023-08-20 15:24:00 +08:00
include mm, hwpoison: when copy-on-write hits poison, take page offline 2023-08-20 15:24:10 +08:00
init kbuild: Add CONFIG_PAHOLE_VERSION 2023-04-19 17:59:33 +08:00
io_uring io_uring/net: disable partial retries for recvmsg with cmsg 2023-08-20 15:23:59 +08:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2023-04-19 17:56:54 +08:00
kernel bpf: ensure main program has an extable 2023-08-20 15:24:10 +08:00
lib test_firmware: fix a memory leak with reqs buffer 2023-08-20 15:21:36 +08:00
LICENSES LICENSES/dual/CC-BY-4.0: Git rid of "smart quotes" 2021-07-15 06:31:24 -06:00
mm mm, hwpoison: when copy-on-write hits poison, take page offline 2023-08-20 15:24:10 +08:00
net can: isotp: isotp_sendmsg(): fix return error fix on TX path 2023-08-20 15:24:10 +08:00
samples samples/bpf: Fix fout leak in hbm's run_bpf_prog 2023-06-06 18:39:30 +08:00
scripts scripts/tags.sh: Resolve gtags empty index generation 2023-08-20 15:24:11 +08:00
security selinux: don't use make's grouped targets feature yet 2023-08-20 15:21:11 +08:00
sound ASoC: nau8824: Add quirk to active-high jack-detect 2023-08-20 15:24:05 +08:00
tools perf symbols: Symbol lookup with kcore can fail if multiple segments match stext 2023-08-20 15:24:11 +08:00
usr usr/include/Makefile: add linux/nfc.h to the compile-test coverage 2023-04-19 17:44:58 +08:00
virt KVM: Avoid illegal stage2 mapping on invalid memory slot 2023-08-20 15:23:58 +08:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: add Andrej Shadura 2021-10-18 20:22:03 -10:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Daniel Drake to credits 2021-09-21 08:34:58 +03:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Remove DECnet support from kernel 2023-08-20 15:23:42 +08:00
Makefile Linux 5.15.119 2023-08-20 15:24:05 +08:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

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.