Linux mainline fork with MSM8998 patches | https://mainline.space | Currently supported devices:
OnePlus 5/5T, Xiaomi Mi 6, F(x)tec Pro¹ (2019 QX1000 model) & Sony Xperia XZ Premium (UNTESTED!)
987914ab84
After a successful allocation of path_rec, num_paths is set to 1, but any
error after such allocation will leave num_paths uncleared.
This causes to de-referencing a NULL pointer later on. Hence, num_paths
needs to be set back to 0 if such an error occurs.
The following crash from syzkaller revealed it.
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI
CPU: 0 PID: 357 Comm: syz-executor060 Not tainted 4.18.0+ #311
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.11.0-0-g63451fca13-prebuilt.qemu-project.org 04/01/2014
RIP: 0010:ib_copy_path_rec_to_user+0x94/0x3e0
Code: f1 f1 f1 f1 c7 40 0c 00 00 f4 f4 65 48 8b 04 25 28 00 00 00 48 89
45 c8 31 c0 e8 d7 60 24 ff 48 8d 7b 4c 48 89 f8 48 c1 e8 03 <42> 0f b6
14 30 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85
RSP: 0018:ffff88006586f980 EFLAGS: 00010207
RAX: 0000000000000009 RBX: 0000000000000000 RCX: 1ffff1000d5fe475
RDX: ffff8800621e17c0 RSI: ffffffff820d45f9 RDI: 000000000000004c
RBP: ffff88006586fa50 R08: ffffed000cb0df73 R09: ffffed000cb0df72
R10: ffff88006586fa70 R11: ffffed000cb0df73 R12: 1ffff1000cb0df30
R13: ffff88006586fae8 R14: dffffc0000000000 R15: ffff88006aff2200
FS: 00000000016fc880(0000) GS:ffff88006d000000(0000)
knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000040 CR3: 0000000063fec000 CR4: 00000000000006b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
? ib_copy_path_rec_from_user+0xcc0/0xcc0
? __mutex_unlock_slowpath+0xfc/0x670
? wait_for_completion+0x3b0/0x3b0
? ucma_query_route+0x818/0xc60
ucma_query_route+0x818/0xc60
? ucma_listen+0x1b0/0x1b0
? sched_clock_cpu+0x18/0x1d0
? sched_clock_cpu+0x18/0x1d0
? ucma_listen+0x1b0/0x1b0
? ucma_write+0x292/0x460
ucma_write+0x292/0x460
? ucma_close_id+0x60/0x60
? sched_clock_cpu+0x18/0x1d0
? sched_clock_cpu+0x18/0x1d0
__vfs_write+0xf7/0x620
? ucma_close_id+0x60/0x60
? kernel_read+0x110/0x110
? time_hardirqs_on+0x19/0x580
? lock_acquire+0x18b/0x3a0
? finish_task_switch+0xf3/0x5d0
? _raw_spin_unlock_irq+0x29/0x40
? _raw_spin_unlock_irq+0x29/0x40
? finish_task_switch+0x1be/0x5d0
? __switch_to_asm+0x34/0x70
? __switch_to_asm+0x40/0x70
? security_file_permission+0x172/0x1e0
vfs_write+0x192/0x460
ksys_write+0xc6/0x1a0
? __ia32_sys_read+0xb0/0xb0
? entry_SYSCALL_64_after_hwframe+0x3e/0xbe
? do_syscall_64+0x1d/0x470
do_syscall_64+0x9e/0x470
entry_SYSCALL_64_after_hwframe+0x49/0xbe
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.