On 10/25/2024 09:40, Tvrtko Ursulin wrote:
On 25/10/2024 15:23, Mario Limonciello wrote:
On 10/25/2024 09:15, Tvrtko Ursulin wrote:
From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxx>
KASAN reports that the GPU metrics table allocated in
vangogh_tables_init() is not large enough for the memset done in
smu_cmn_init_soft_gpu_metrics(). Condensed report follows:
[ 33.861314] BUG: KASAN: slab-out-of-bounds in
smu_cmn_init_soft_gpu_metrics+0x73/0x200 [amdgpu]
[ 33.861799] Write of size 168 at addr ffff888129f59500 by task
mangoapp/1067
...
[ 33.861808] CPU: 6 UID: 1000 PID: 1067 Comm: mangoapp Tainted:
G W 6.12.0-rc4 #356
1a56f59a8b5182eeaf67eb7cb8b13594dd23b544
[ 33.861816] Tainted: [W]=WARN
[ 33.861818] Hardware name: Valve Galileo/Galileo, BIOS F7G0107
12/01/2023
[ 33.861822] Call Trace:
[ 33.861826] <TASK>
[ 33.861829] dump_stack_lvl+0x66/0x90
[ 33.861838] print_report+0xce/0x620
[ 33.861853] kasan_report+0xda/0x110
[ 33.862794] kasan_check_range+0xfd/0x1a0
[ 33.862799] __asan_memset+0x23/0x40
[ 33.862803] smu_cmn_init_soft_gpu_metrics+0x73/0x200 [amdgpu
13b1bc364ec578808f676eba412c20eaab792779]
[ 33.863306] vangogh_get_gpu_metrics_v2_4+0x123/0xad0 [amdgpu
13b1bc364ec578808f676eba412c20eaab792779]
[ 33.864257] vangogh_common_get_gpu_metrics+0xb0c/0xbc0 [amdgpu
13b1bc364ec578808f676eba412c20eaab792779]
[ 33.865682] amdgpu_dpm_get_gpu_metrics+0xcc/0x110 [amdgpu
13b1bc364ec578808f676eba412c20eaab792779]
[ 33.866160] amdgpu_get_gpu_metrics+0x154/0x2d0 [amdgpu
13b1bc364ec578808f676eba412c20eaab792779]
[ 33.867135] dev_attr_show+0x43/0xc0
[ 33.867147] sysfs_kf_seq_show+0x1f1/0x3b0
[ 33.867155] seq_read_iter+0x3f8/0x1140
[ 33.867173] vfs_read+0x76c/0xc50
[ 33.867198] ksys_read+0xfb/0x1d0
[ 33.867214] do_syscall_64+0x90/0x160
...
[ 33.867353] Allocated by task 378 on cpu 7 at 22.794876s:
[ 33.867358] kasan_save_stack+0x33/0x50
[ 33.867364] kasan_save_track+0x17/0x60
[ 33.867367] __kasan_kmalloc+0x87/0x90
[ 33.867371] vangogh_init_smc_tables+0x3f9/0x840 [amdgpu]
[ 33.867835] smu_sw_init+0xa32/0x1850 [amdgpu]
[ 33.868299] amdgpu_device_init+0x467b/0x8d90 [amdgpu]
[ 33.868733] amdgpu_driver_load_kms+0x19/0xf0 [amdgpu]
[ 33.869167] amdgpu_pci_probe+0x2d6/0xcd0 [amdgpu]
[ 33.869608] local_pci_probe+0xda/0x180
[ 33.869614] pci_device_probe+0x43f/0x6b0
Empirically we can confirm that the former allocates 152 bytes for the
table, while the latter memsets the 168 large block.
This is somewhat alleviated by the fact that allocation goes into a 192
SLAB bucket, but then for v3_0 metrics the table grows to 264 bytes
which
would definitely be a problem.
Root cause appears that when GPU metrics tables for v2_4 parts were
added
it was not considered to enlarge the table to fit.
The fix in this patch is rather "brute force" and perhaps later
should be
done in a smarter way, by extracting and consolidating the part
version to
size logic to a common helper, instead of brute forcing the largest
possible allocation. Nevertheless, for now this works and fixes the
out of
bounds write.
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxxx>
Fixes: 41cec40bc9ba ("drm/amd/pm: Vangogh: Add new gpu_metrics_v2_4
to acquire gpu_metrics")
Cc: Mario Limonciello <mario.limonciello@xxxxxxx>
Cc: Evan Quan <evan.quan@xxxxxxx>
Cc: Wenyou Yang <WenYou.Yang@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v6.6+
---
drivers/gpu/drm/amd/pm/swsmu/smu11/vangogh_ppt.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu11/vangogh_ppt.c b/
drivers/gpu/drm/amd/pm/swsmu/smu11/vangogh_ppt.c
index 22737b11b1bf..36f4a4651918 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu11/vangogh_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/vangogh_ppt.c
@@ -242,7 +242,10 @@ static int vangogh_tables_init(struct
smu_context *smu)
goto err0_out;
smu_table->metrics_time = 0;
- smu_table->gpu_metrics_table_size = max(sizeof(struct
gpu_metrics_v2_3), sizeof(struct gpu_metrics_v2_2));
+ smu_table->gpu_metrics_table_size = sizeof(struct
gpu_metrics_v2_2);
+ smu_table->gpu_metrics_table_size = max(smu_table-
>gpu_metrics_table_size, sizeof(struct gpu_metrics_v2_3));
+ smu_table->gpu_metrics_table_size = max(smu_table-
>gpu_metrics_table_size, sizeof(struct gpu_metrics_v2_4));
+ smu_table->gpu_metrics_table_size = max(smu_table-
>gpu_metrics_table_size, sizeof(struct gpu_metrics_v3_0));
AFAICT Van Gogh only supports 2.2, 2.3 or 2.4. I don't think there is
a need to compare to 3.0 to solve this bug this way.
Gotcha.
But generally yeah moving the initialization to a helper that actually
knows the size would be another way to solve this.
Yeah I was looking at smu_cmn_init_soft_gpu_metrics() and how it has the
data of how large table needs to be for each frev+crev combo. But didn't
go as far as trying to figure out if frev+crev would be available at
table allocation time.
Or looking at it how about moving all the conditional code in
vangogh_common_get_gpu_metrics() into vangogh_tables_init() and then
assigning a vfunc for vangogh_common_get_gpu_metrics() to call?
I did not quite follow. Happy to work on it though and I can look into
it with fresh eyes but not next week, but the week after.
Or in the meantime if you want me to respin this fix just with v3_0 line
removed I can do that today.
Yeah thanks for the respin.
Regarding what my suggestion was let me try to explain it.
1. Whenever vangogh_common_get_gpu_metrics() is called it will go down
into the functions to gather data that match either 2.2, 2.3 or 2.4
based upon the platform firmware.
2. Instead of querying in vangogh_common_get_gpu_metrics(), there can be
a function pointer that vangogh_common_get_gpu_metrics() calls to make
it much simpler.
3. vangogh_tables_init() can then detect whether it's 2.2, 2.3, or 2.4
instead.
By doing it this way, you can allocate the exactly correct size
structure when it's initialized and you can set that function pointer
that vangogh_common_get_gpu_metrics() would use during init.
Regards,
Tvrtko
smu_table->gpu_metrics_table = kzalloc(smu_table-
>gpu_metrics_table_size, GFP_KERNEL);
if (!smu_table->gpu_metrics_table)
goto err1_out;
