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CVE-2023-31085: Re: BUG: divide error in ubi_attach_mtd_dev

An issue was discovered in drivers/mtd/ubi/cdev.c in the Linux kernel 6.2. There is a divide-by-zero error in do_div(sz,mtd->erasesize), used indirectly by ctrl_cdev_ioctl, when mtd->erasesize is 0.

CVE
#ios#ubuntu#linux#git#java#bios

From: Richard Weinberger [email protected] To: Yu Hao [email protected] Cc: Miquel Raynal [email protected], Vignesh Raghavendra [email protected], linux-mtd [email protected], linux-kernel [email protected] Subject: Re: BUG: divide error in ubi_attach_mtd_dev Date: Tue, 18 Apr 2023 08:30:47 +0200 (CEST) [thread overview] Message-ID: [email protected] (raw) In-Reply-To: <CA+UBctDsHRpkLG5ppdiuV8Msn4Dx-ZJ2xDrxfa48VMb7ZE+xBA@mail.gmail.com>

Yu Hao,

----- Ursprüngliche Mail ----- > Von: “Yu Hao” [email protected]

ubi: mtd0 is already attached to ubi0 ubi7: attaching mtd147 divide error: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 20023 Comm: syz-executor.0 Not tainted 6.2.0 #6 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:mtd_div_by_eb include/linux/mtd/mtd.h:580 [inline] RIP: 0010:io_init drivers/mtd/ubi/build.c:620 [inline] RIP: 0010:ubi_attach_mtd_dev+0x77f/0x2fe0 drivers/mtd/ubi/build.c:955 Code: fc ff df 48 c1 ea 03 0f b6 14 02 4c 89 f0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 1f 25 00 00 41 8b 4c 24 10 48 89 d8 31 d2 <48> f7 f1 48 89 c3 e8 b6 f3 1b fc 48 8d 85 40 17 00 00 48 89 c2 48 RSP: 0018:ffffc9000be0fd30 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff888047a49d40 RDI: 0000000000000002 RBP: ffff888024e1c000 R08: 0000000000000016 R09: fffff520017c1f47 R10: ffffc9000be0fa37 R11: fffff520017c1f46 R12: ffff88806545a000 R13: 0000000000000000 R14: ffff88806545a010 R15: 0000000000000007 FS: 00007fd45e85c700(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f64aeef53a4 CR3: 000000004f39a000 CR4: 0000000000350ef0 Call Trace: <TASK> ctrl_cdev_ioctl+0x303/0x3a0 drivers/mtd/ubi/cdev.c:1043 What kind of MTD you attaching? Has it erasesize 0?

Thanks, //richard

WARNING: multiple messages have this Message-ID

From: Richard Weinberger [email protected] To: Yu Hao [email protected] Cc: Miquel Raynal [email protected], Vignesh Raghavendra [email protected], linux-mtd [email protected], linux-kernel [email protected] Subject: Re: BUG: divide error in ubi_attach_mtd_dev Date: Tue, 18 Apr 2023 08:30:47 +0200 (CEST) [thread overview] Message-ID: [email protected] (raw) In-Reply-To: <CA+UBctDsHRpkLG5ppdiuV8Msn4Dx-ZJ2xDrxfa48VMb7ZE+xBA@mail.gmail.com>

Yu Hao,

----- Ursprüngliche Mail ----- > Von: “Yu Hao” [email protected]

ubi: mtd0 is already attached to ubi0 ubi7: attaching mtd147 divide error: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 20023 Comm: syz-executor.0 Not tainted 6.2.0 #6 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:mtd_div_by_eb include/linux/mtd/mtd.h:580 [inline] RIP: 0010:io_init drivers/mtd/ubi/build.c:620 [inline] RIP: 0010:ubi_attach_mtd_dev+0x77f/0x2fe0 drivers/mtd/ubi/build.c:955 Code: fc ff df 48 c1 ea 03 0f b6 14 02 4c 89 f0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 1f 25 00 00 41 8b 4c 24 10 48 89 d8 31 d2 <48> f7 f1 48 89 c3 e8 b6 f3 1b fc 48 8d 85 40 17 00 00 48 89 c2 48 RSP: 0018:ffffc9000be0fd30 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff888047a49d40 RDI: 0000000000000002 RBP: ffff888024e1c000 R08: 0000000000000016 R09: fffff520017c1f47 R10: ffffc9000be0fa37 R11: fffff520017c1f46 R12: ffff88806545a000 R13: 0000000000000000 R14: ffff88806545a010 R15: 0000000000000007 FS: 00007fd45e85c700(0000) GS:ffff88802ca00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f64aeef53a4 CR3: 000000004f39a000 CR4: 0000000000350ef0 Call Trace: <TASK> ctrl_cdev_ioctl+0x303/0x3a0 drivers/mtd/ubi/cdev.c:1043 What kind of MTD you attaching? Has it erasesize 0?

Thanks, //richard

______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/

next prev parent reply other threads:[~2023-04-18 6:30 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-04-18 5:10 BUG: divide error in ubi_attach_mtd_dev Yu Hao 2023-04-18 5:16 ` Yu Hao 2023-04-18 5:16 ` Yu Hao 2023-04-18 6:30 ` Richard Weinberger [this message] 2023-04-18 6:30 ` Richard Weinberger 2023-04-20 4:49 ` Zhihao Cheng 2023-04-20 4:49 ` Zhihao Cheng 2023-04-20 17:27 ` Yu Hao 2023-04-20 17:27 ` Yu Hao 2023-04-20 17:33 ` Richard Weinberger 2023-04-20 17:33 ` Richard Weinberger 2023-04-20 18:14 ` Yu Hao 2023-04-20 18:14 ` Yu Hao 2023-04-20 20:36 ` Richard Weinberger 2023-04-20 20:36 ` Richard Weinberger 2023-04-23 3:20 ` Zhihao Cheng 2023-04-23 3:20 ` Zhihao Cheng 2023-04-23 8:02 ` Richard Weinberger 2023-04-23 8:02 ` Richard Weinberger 2023-04-23 9:13 ` Zhihao Cheng 2023-04-23 9:13 ` Zhihao Cheng

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