mainlining shenanigans
2eef1399a8
When loading a module with rodata=n, it causes an executing
NX-protected page BUG.
[ 32.379191] kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
[ 32.382917] BUG: unable to handle page fault for address: ffffffffc0005000
[ 32.385947] #PF: supervisor instruction fetch in kernel mode
[ 32.387662] #PF: error_code(0x0011) - permissions violation
[ 32.389352] PGD 240c067 P4D 240c067 PUD 240e067 PMD 421a52067 PTE 8000000421a53063
[ 32.391396] Oops: 0011 [#1] SMP PTI
[ 32.392478] CPU: 7 PID: 2697 Comm: insmod Tainted: G O 5.2.0-rc5+ #202
[ 32.394588] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 04/01/2014
[ 32.398157] RIP: 0010:ko_test_init+0x0/0x1000 [ko_test]
[ 32.399662] Code: Bad RIP value.
[ 32.400621] RSP: 0018:ffffc900029f3ca8 EFLAGS: 00010246
[ 32.402171] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[ 32.404332] RDX: 00000000000004c7 RSI: 0000000000000cc0 RDI: ffffffffc0005000
[ 32.406347] RBP: ffffffffc0005000 R08: ffff88842fbebc40 R09: ffffffff810ede4a
[ 32.408392] R10: ffffea00108e3480 R11: 0000000000000000 R12: ffff88842bee21a0
[ 32.410472] R13: 0000000000000001 R14: 0000000000000001 R15: ffffc900029f3e78
[ 32.412609] FS: 00007fb4f0c0a700(0000) GS:ffff88842fbc0000(0000) knlGS:0000000000000000
[ 32.414722] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 32.416290] CR2: ffffffffc0004fd6 CR3: 0000000421a90004 CR4: 0000000000020ee0
[ 32.418471] Call Trace:
[ 32.419136] do_one_initcall+0x41/0x1df
[ 32.420199] ? _cond_resched+0x10/0x40
[ 32.421433] ? kmem_cache_alloc_trace+0x36/0x160
[ 32.422827] do_init_module+0x56/0x1f7
[ 32.423946] load_module+0x1e67/0x2580
[ 32.424947] ? __alloc_pages_nodemask+0x150/0x2c0
[ 32.426413] ? map_vm_area+0x2d/0x40
[ 32.427530] ? __vmalloc_node_range+0x1ef/0x260
[ 32.428850] ? __do_sys_init_module+0x135/0x170
[ 32.430060] ? _cond_resched+0x10/0x40
[ 32.431249] __do_sys_init_module+0x135/0x170
[ 32.432547] do_syscall_64+0x43/0x120
[ 32.433853] entry_SYSCALL_64_after_hwframe+0x44/0xa9
Because if rodata=n, set_memory_x() can't be called, fix this by
calling set_memory_x in complete_formation();
Fixes:
|
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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.