On Mon, Nov 20, 2023 at 10:41:18PM +0800, Edward Adam Davis wrote:
> [Syz Log]
> divide error: 0000 [#1] PREEMPT SMP KASAN
> CPU: 0 PID: 5068 Comm: syz-executor357 Not tainted 6.6.0-syzkaller-16039-gac347a0655db #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
> RIP: 0010:drm_mode_vrefresh drivers/gpu/drm/drm_modes.c:1303 [inline]
> RIP: 0010:drm_mode_debug_printmodeline+0x118/0x4e0 drivers/gpu/drm/drm_modes.c:60
> Code: 00 41 0f b7 07 66 83 f8 02 b9 01 00 00 00 0f 43 c8 0f b7 c1 0f af e8 44 89 f0 48 69 c8 e8 03 00 00 89 e8 d1 e8 48 01 c8 31 d2 <48> f7 f5 49 89 c6 eb 0c e8 fb 07 66 fc eb 05 e8 f4 07 66 fc 48 89
> RSP: 0018:ffffc9000391f8d0 EFLAGS: 00010246
> RAX: 000000000001f400 RBX: ffff888025045000 RCX: 000000000001f400
> RDX: 0000000000000000 RSI: 0000000000008000 RDI: ffff888025045018
> RBP: 0000000000000000 R08: ffffffff8528b9af R09: 0000000000000000
> R10: ffffc9000391f8a0 R11: fffff52000723f17 R12: 0000000000000080
> R13: dffffc0000000000 R14: 0000000000000080 R15: ffff888025045016
> FS: 0000555556932380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00000000005fdeb8 CR3: 000000007fcff000 CR4: 00000000003506f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> <TASK>
> drm_mode_setcrtc+0x83b/0x1880 drivers/gpu/drm/drm_crtc.c:794
> drm_ioctl_kernel+0x362/0x500 drivers/gpu/drm/drm_ioctl.c:792
> drm_ioctl+0x636/0xb00 drivers/gpu/drm/drm_ioctl.c:895
> vfs_ioctl fs/ioctl.c:51 [inline]
> __do_sys_ioctl fs/ioctl.c:871 [inline]
> __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857
> do_syscall_x64 arch/x86/entry/common.c:51 [inline]
> do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
> entry_SYSCALL_64_after_hwframe+0x63/0x6b
>
> [Analysis]
> When calculating den in drm_mode_vrefresh(), if the vscan value is too large,
> there is a probability of unsigned integer overflow.
>
> [Fix]
> Before multiplying by vscan, first check if their product will overflow.
> If overflow occurs, return 0 and exit the subsequent process.
>
> Reported-and-tested-by: [email protected]
> Fixes: ea40d7857d52 ("drm/vkms: fbdev emulation support")
> Signed-off-by: Edward Adam Davis <[email protected]>
> ---
> drivers/gpu/drm/drm_modes.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletion(-)
>
> diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
> index ac9a406250c5..60739d861da2 100644
> --- a/drivers/gpu/drm/drm_modes.c
> +++ b/drivers/gpu/drm/drm_modes.c
> @@ -36,6 +36,7 @@
> #include <linux/list.h>
> #include <linux/list_sort.h>
> #include <linux/of.h>
> +#include <linux/overflow.h>
>
> #include <video/of_display_timing.h>
> #include <video/of_videomode.h>
> @@ -1297,8 +1298,10 @@ int drm_mode_vrefresh(const struct drm_display_mode *mode)
> num *= 2;
> if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
> den *= 2;
> - if (mode->vscan > 1)
> - den *= mode->vscan;
> + if (mode->vscan > 1) {
> + if (unlikely(check_mul_overflow(den, mode->vscan, &den)))
> + return 0;
> + }
I can't see any driver that actually supports vscan>1. Only
nouveau has some code for it, but doesn't look like it does
anything sensible. All other drivers for sure should be
rejecting vscan>1 outright. Which driver is this?
Is there an actual usecase where nouveau needs this (and does
it even work?) or could we just rip out the whole thing and
reject vscan>1 globally?
>
> return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(num, 1000), den);
> }
> --
> 2.25.1
--
Ville Syrj?l?
Intel
On Mon, 20 Nov 2023, Ville Syrjälä <[email protected]> wrote:
> On Mon, Nov 20, 2023 at 10:41:18PM +0800, Edward Adam Davis wrote:
>> [Syz Log]
>> divide error: 0000 [#1] PREEMPT SMP KASAN
>> CPU: 0 PID: 5068 Comm: syz-executor357 Not tainted 6.6.0-syzkaller-16039-gac347a0655db #0
>> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
>> RIP: 0010:drm_mode_vrefresh drivers/gpu/drm/drm_modes.c:1303 [inline]
>> RIP: 0010:drm_mode_debug_printmodeline+0x118/0x4e0 drivers/gpu/drm/drm_modes.c:60
>> Code: 00 41 0f b7 07 66 83 f8 02 b9 01 00 00 00 0f 43 c8 0f b7 c1 0f af e8 44 89 f0 48 69 c8 e8 03 00 00 89 e8 d1 e8 48 01 c8 31 d2 <48> f7 f5 49 89 c6 eb 0c e8 fb 07 66 fc eb 05 e8 f4 07 66 fc 48 89
>> RSP: 0018:ffffc9000391f8d0 EFLAGS: 00010246
>> RAX: 000000000001f400 RBX: ffff888025045000 RCX: 000000000001f400
>> RDX: 0000000000000000 RSI: 0000000000008000 RDI: ffff888025045018
>> RBP: 0000000000000000 R08: ffffffff8528b9af R09: 0000000000000000
>> R10: ffffc9000391f8a0 R11: fffff52000723f17 R12: 0000000000000080
>> R13: dffffc0000000000 R14: 0000000000000080 R15: ffff888025045016
>> FS: 0000555556932380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
>> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
>> CR2: 00000000005fdeb8 CR3: 000000007fcff000 CR4: 00000000003506f0
>> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
>> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>> Call Trace:
>> <TASK>
>> drm_mode_setcrtc+0x83b/0x1880 drivers/gpu/drm/drm_crtc.c:794
>> drm_ioctl_kernel+0x362/0x500 drivers/gpu/drm/drm_ioctl.c:792
>> drm_ioctl+0x636/0xb00 drivers/gpu/drm/drm_ioctl.c:895
>> vfs_ioctl fs/ioctl.c:51 [inline]
>> __do_sys_ioctl fs/ioctl.c:871 [inline]
>> __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857
>> do_syscall_x64 arch/x86/entry/common.c:51 [inline]
>> do_syscall_64+0x44/0x110 arch/x86/entry/common.c:82
>> entry_SYSCALL_64_after_hwframe+0x63/0x6b
>>
>> [Analysis]
>> When calculating den in drm_mode_vrefresh(), if the vscan value is too large,
>> there is a probability of unsigned integer overflow.
>>
>> [Fix]
>> Before multiplying by vscan, first check if their product will overflow.
>> If overflow occurs, return 0 and exit the subsequent process.
>>
>> Reported-and-tested-by: [email protected]
>> Fixes: ea40d7857d52 ("drm/vkms: fbdev emulation support")
>> Signed-off-by: Edward Adam Davis <[email protected]>
>> ---
>> drivers/gpu/drm/drm_modes.c | 7 +++++--
>> 1 file changed, 5 insertions(+), 2 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
>> index ac9a406250c5..60739d861da2 100644
>> --- a/drivers/gpu/drm/drm_modes.c
>> +++ b/drivers/gpu/drm/drm_modes.c
>> @@ -36,6 +36,7 @@
>> #include <linux/list.h>
>> #include <linux/list_sort.h>
>> #include <linux/of.h>
>> +#include <linux/overflow.h>
>>
>> #include <video/of_display_timing.h>
>> #include <video/of_videomode.h>
>> @@ -1297,8 +1298,10 @@ int drm_mode_vrefresh(const struct drm_display_mode *mode)
>> num *= 2;
>> if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
>> den *= 2;
>> - if (mode->vscan > 1)
>> - den *= mode->vscan;
>> + if (mode->vscan > 1) {
>> + if (unlikely(check_mul_overflow(den, mode->vscan, &den)))
>> + return 0;
>> + }
>
> I can't see any driver that actually supports vscan>1. Only
> nouveau has some code for it, but doesn't look like it does
> anything sensible. All other drivers for sure should be
> rejecting vscan>1 outright. Which driver is this?
>
> Is there an actual usecase where nouveau needs this (and does
> it even work?) or could we just rip out the whole thing and
> reject vscan>1 globally?
I thought the whole thing seemed familiar [1].
BR,
Jani.
[1] https://lore.kernel.org/r/[email protected]
>
>>
>> return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(num, 1000), den);
>> }
>> --
>> 2.25.1
--
Jani Nikula, Intel