Frantisek Hrbata
2020-Aug-28 09:28 UTC
[Nouveau] [PATCH] drm/nouveau: bail out of nouveau_channel_new if channel init fails
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: eeaf06ac1a55 ("drm/nouveau/svm: initial support for shared virtual
memory")
Signed-off-by: Frantisek Hrbata <frantisek at hrbata.com>
---
drivers/gpu/drm/nouveau/nouveau_chan.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/nouveau/nouveau_chan.c
b/drivers/gpu/drm/nouveau/nouveau_chan.c
index b80e4ebf1..a7a47b325 100644
--- a/drivers/gpu/drm/nouveau/nouveau_chan.c
+++ b/drivers/gpu/drm/nouveau/nouveau_chan.c
@@ -533,6 +533,7 @@ nouveau_channel_new(struct nouveau_drm *drm, struct
nvif_device *device,
if (ret) {
NV_PRINTK(err, cli, "channel failed to initialise, %d\n", ret);
nouveau_channel_del(pchan);
+ goto done;
}
ret = nouveau_svmm_join((*pchan)->vmm->svmm, (*pchan)->inst);
--
Frantisek Hrbata
Karol Herbst
2020-Aug-28 17:36 UTC
[Nouveau] [PATCH] drm/nouveau: bail out of nouveau_channel_new if channel init fails
On Fri, Aug 28, 2020 at 2:05 PM Frantisek Hrbata <frantisek at hrbata.com> wrote:> > 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: eeaf06ac1a55 ("drm/nouveau/svm: initial support for shared virtual memory") > Signed-off-by: Frantisek Hrbata <frantisek at hrbata.com> > --- > drivers/gpu/drm/nouveau/nouveau_chan.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/gpu/drm/nouveau/nouveau_chan.c b/drivers/gpu/drm/nouveau/nouveau_chan.c > index b80e4ebf1..a7a47b325 100644 > --- a/drivers/gpu/drm/nouveau/nouveau_chan.c > +++ b/drivers/gpu/drm/nouveau/nouveau_chan.c > @@ -533,6 +533,7 @@ nouveau_channel_new(struct nouveau_drm *drm, struct nvif_device *device, > if (ret) { > NV_PRINTK(err, cli, "channel failed to initialise, %d\n", ret); > nouveau_channel_del(pchan); > + goto done; > } > > ret = nouveau_svmm_join((*pchan)->vmm->svmm, (*pchan)->inst); > -- > Frantisek Hrbata > > _______________________________________________ > Nouveau mailing list > Nouveau at lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/nouveau >Reviewed-by: Karol Herbst <kherbst at redhat.com>
Frantisek Hrbata
2020-Aug-28 18:29 UTC
[Nouveau] [PATCH] drm/nouveau: bail out of nouveau_channel_new if channel init fails
Hi,
I'm sorry for another email, but it seems that all lines in the
reproducer starting with '#' got trimmed as they were comments.
Probably something I did on my side :(. Would it be possible to
fix this in the commit msg or do you prefer v2?
Thank you
simplified reproducer
---------------------------------8<----------------------------------------
/*
* gcc -o crashme crashme.c
* ./crashme /dev/dri/renderD128
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <drm/drm.h>
#include <drm/nouveau_drm.h>
#include <inttypes.h>
#include <string.h>
#include <error.h>
#define die(format, err, ...) error(1, err, format, ## __VA_ARGS__)
#ifndef DRM_IOCTL_NOUVEAU_CHANNEL_ALLOC
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;
};
#define DRM_IOCTL_NOUVEAU_CHANNEL_ALLOC DRM_IOWR(DRM_COMMAND_BASE +
DRM_NOUVEAU_CHANNEL_ALLOC, struct drm_nouveau_channel_alloc)
#endif
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<----------------------------------------
--
Frantisek Hrbata
Salvatore Bonaccorso
2020-Nov-15 09:10 UTC
[Nouveau] [PATCH] drm/nouveau: bail out of nouveau_channel_new if channel init fails
Hi, On Fri, Aug 28, 2020 at 11:28:46AM +0200, Frantisek Hrbata wrote:> 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: eeaf06ac1a55 ("drm/nouveau/svm: initial support for shared virtual memory") > Signed-off-by: Frantisek Hrbata <frantisek at hrbata.com> > --- > drivers/gpu/drm/nouveau/nouveau_chan.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/gpu/drm/nouveau/nouveau_chan.c b/drivers/gpu/drm/nouveau/nouveau_chan.c > index b80e4ebf1..a7a47b325 100644 > --- a/drivers/gpu/drm/nouveau/nouveau_chan.c > +++ b/drivers/gpu/drm/nouveau/nouveau_chan.c > @@ -533,6 +533,7 @@ nouveau_channel_new(struct nouveau_drm *drm, struct nvif_device *device, > if (ret) { > NV_PRINTK(err, cli, "channel failed to initialise, %d\n", ret); > nouveau_channel_del(pchan); > + goto done; > } > > ret = nouveau_svmm_join((*pchan)->vmm->svmm, (*pchan)->inst); > -- > Frantisek HrbataIs this still planned to be applied? AFAICS this is the fix for CVE-2020-25639. Regards, Salvatore
Karol Herbst
2020-Nov-15 19:18 UTC
[Nouveau] [PATCH] drm/nouveau: bail out of nouveau_channel_new if channel init fails
On Sun, Nov 15, 2020 at 6:43 PM Salvatore Bonaccorso <carnil at debian.org> wrote:> > Hi, > > On Fri, Aug 28, 2020 at 11:28:46AM +0200, Frantisek Hrbata wrote: > > 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: eeaf06ac1a55 ("drm/nouveau/svm: initial support for shared virtual memory") > > Signed-off-by: Frantisek Hrbata <frantisek at hrbata.com> > > --- > > drivers/gpu/drm/nouveau/nouveau_chan.c | 1 + > > 1 file changed, 1 insertion(+) > > > > diff --git a/drivers/gpu/drm/nouveau/nouveau_chan.c b/drivers/gpu/drm/nouveau/nouveau_chan.c > > index b80e4ebf1..a7a47b325 100644 > > --- a/drivers/gpu/drm/nouveau/nouveau_chan.c > > +++ b/drivers/gpu/drm/nouveau/nouveau_chan.c > > @@ -533,6 +533,7 @@ nouveau_channel_new(struct nouveau_drm *drm, struct nvif_device *device, > > if (ret) { > > NV_PRINTK(err, cli, "channel failed to initialise, %d\n", ret); > > nouveau_channel_del(pchan); > > + goto done; > > } > > > > ret = nouveau_svmm_join((*pchan)->vmm->svmm, (*pchan)->inst); > > -- > > Frantisek Hrbata > > Is this still planned to be applied? AFAICS this is the fix for > CVE-2020-25639. >If it's urgent to get it fixed, I suggest going through the Linux kernel or drm stable path. CCing dri-devel, Dave, Daniel and Ben.> Regards, > Salvatore > _______________________________________________ > Nouveau mailing list > Nouveau at lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/nouveau >
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