mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 01:54:09 +08:00
eaba3b2840
Unprivileged user can crash kernel by using DRM_IOCTL_NOUVEAU_CHANNEL_ALLOC
ioctl. This was reported by trinity[1] fuzzer.
[ 71.073906] nouveau 0000:01:00.0: crashme[1329]: channel failed to initialise, -17
[ 71.081730] BUG: kernel NULL pointer dereference, address: 00000000000000a0
[ 71.088928] #PF: supervisor read access in kernel mode
[ 71.094059] #PF: error_code(0x0000) - not-present page
[ 71.099189] PGD 119590067 P4D 119590067 PUD 1054f5067 PMD 0
[ 71.104842] Oops: 0000 [#1] SMP NOPTI
[ 71.108498] CPU: 2 PID: 1329 Comm: crashme Not tainted 5.8.0-rc6+ #2
[ 71.114993] Hardware name: AMD Pike/Pike, BIOS RPK1506A 09/03/2014
[ 71.121213] RIP: 0010:nouveau_abi16_ioctl_channel_alloc+0x108/0x380 [nouveau]
[ 71.128339] Code: 48 89 9d f0 00 00 00 41 8b 4c 24 04 41 8b 14 24 45 31 c0 4c 8d 4b 10 48 89 ee 4c 89 f7 e8 10 11 00 00 85 c0 75 78 48 8b 43 10 <8b> 90 a0 00 00 00 41 89 54 24 08 80 7d 3d 05 0f 86 bb 01 00 00 41
[ 71.147074] RSP: 0018:ffffb4a1809cfd38 EFLAGS: 00010246
[ 71.152526] RAX: 0000000000000000 RBX: ffff98cedbaa1d20 RCX: 00000000000003bf
[ 71.159651] RDX: 00000000000003be RSI: 0000000000000000 RDI: 0000000000030160
[ 71.166774] RBP: ffff98cee776de00 R08: ffffdc0144198a08 R09: ffff98ceeefd4000
[ 71.173901] R10: ffff98cee7e81780 R11: 0000000000000001 R12: ffffb4a1809cfe08
[ 71.181214] R13: ffff98cee776d000 R14: ffff98cec519e000 R15: ffff98cee776def0
[ 71.188339] FS: 00007fd926250500(0000) GS:ffff98ceeac80000(0000) knlGS:0000000000000000
[ 71.196418] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 71.202155] CR2: 00000000000000a0 CR3: 0000000106622000 CR4: 00000000000406e0
[ 71.209297] Call Trace:
[ 71.211777] ? nouveau_abi16_ioctl_getparam+0x1f0/0x1f0 [nouveau]
[ 71.218053] drm_ioctl_kernel+0xac/0xf0 [drm]
[ 71.222421] drm_ioctl+0x211/0x3c0 [drm]
[ 71.226379] ? nouveau_abi16_ioctl_getparam+0x1f0/0x1f0 [nouveau]
[ 71.232500] nouveau_drm_ioctl+0x57/0xb0 [nouveau]
[ 71.237285] ksys_ioctl+0x86/0xc0
[ 71.240595] __x64_sys_ioctl+0x16/0x20
[ 71.244340] do_syscall_64+0x4c/0x90
[ 71.248110] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 71.253162] RIP: 0033:0x7fd925d4b88b
[ 71.256731] Code: Bad RIP value.
[ 71.259955] RSP: 002b:00007ffc743592d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
[ 71.267514] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd925d4b88b
[ 71.274637] RDX: 0000000000601080 RSI: 00000000c0586442 RDI: 0000000000000003
[ 71.281986] RBP: 00007ffc74359340 R08: 00007fd926016ce0 R09: 00007fd926016ce0
[ 71.289111] R10: 0000000000000003 R11: 0000000000000206 R12: 0000000000400620
[ 71.296235] R13: 00007ffc74359420 R14: 0000000000000000 R15: 0000000000000000
[ 71.303361] Modules linked in: rfkill sunrpc snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core edac_mce_amd snd_hwdep kvm_amd snd_seq ccp snd_seq_device snd_pcm kvm snd_timer snd irqbypass soundcore sp5100_tco pcspkr crct10dif_pclmul crc32_pclmul ghash_clmulni_intel wmi_bmof joydev i2c_piix4 fam15h_power k10temp acpi_cpufreq ip_tables xfs libcrc32c sd_mod t10_pi sg nouveau video mxm_wmi i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops ttm broadcom bcm_phy_lib ata_generic ahci drm e1000 crc32c_intel libahci serio_raw tg3 libata firewire_ohci firewire_core wmi crc_itu_t dm_mirror dm_region_hash dm_log dm_mod
[ 71.365269] CR2: 00000000000000a0
simplified reproducer
---------------------------------8<----------------------------------------
/*
* gcc -o crashme crashme.c
* ./crashme /dev/dri/renderD128
*/
struct drm_nouveau_channel_alloc {
uint32_t fb_ctxdma_handle;
uint32_t tt_ctxdma_handle;
int channel;
uint32_t pushbuf_domains;
/* Notifier memory */
uint32_t notifier_handle;
/* DRM-enforced subchannel assignments */
struct {
uint32_t handle;
uint32_t grclass;
} subchan[8];
uint32_t nr_subchan;
};
static struct drm_nouveau_channel_alloc channel;
int main(int argc, char *argv[]) {
int fd;
int rv;
if (argc != 2)
die("usage: %s <dev>", 0, argv[0]);
if ((fd = open(argv[1], O_RDONLY)) == -1)
die("open %s", errno, argv[1]);
if (ioctl(fd, DRM_IOCTL_NOUVEAU_CHANNEL_ALLOC, &channel) == -1 &&
errno == EACCES)
die("ioctl %s", errno, argv[1]);
close(fd);
printf("PASS\n");
return 0;
}
---------------------------------8<----------------------------------------
[1] https://github.com/kernelslacker/trinity
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.