linux-kernel - Re: [PATCH] mm/zsmalloc: include sparsemem.h for MAX_PHYSMEM

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Message-ID: <20201108064659.GD301837@kernel.org>
Date:   Sun, 8 Nov 2020 08:46:59 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     Stefan Agner <stefan@...er.ch>
Cc:     minchan@...nel.org, ngupta@...are.org,
        sergey.senozhatsky.work@...il.com, akpm@...ux-foundation.org,
        sjenning@...ux.vnet.ibm.com, gregkh@...uxfoundation.org,
        arnd@...db.de, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/zsmalloc: include sparsemem.h for MAX_PHYSMEM_BITS

On Sat, Nov 07, 2020 at 04:22:06PM +0100, Stefan Agner wrote:
> Most architectures define MAX_PHYSMEM_BITS in asm/sparsemem.h and don't
> include it in asm/pgtable.h. Include asm/sparsemem.h directly to get
> the MAX_PHYSMEM_BITS define on all architectures.
> 
> This fixes a crash when accessing zram on 32-bit ARM platform with LPAE and
> more than 4GB of memory:
>   Unable to handle kernel NULL pointer dereference at virtual address 00000000
>   pgd = a27bd01c
>   [00000000] *pgd=236a0003, *pmd=1ffa64003
>   Internal error: Oops: 207 [#1] SMP ARM
>   Modules linked in: mdio_bcm_unimac(+) brcmfmac cfg80211 brcmutil raspberrypi_hwmon hci_uart crc32_arm_ce bcm2711_thermal phy_generic genet
>   CPU: 0 PID: 123 Comm: mkfs.ext4 Not tainted 5.9.6 #1
>   Hardware name: BCM2711
>   PC is at zs_map_object+0x94/0x338
>   LR is at zram_bvec_rw.constprop.0+0x330/0xa64
>   pc : [<c0602b38>]    lr : [<c0bda6a0>]    psr: 60000013
>   sp : e376bbe0  ip : 00000000  fp : c1e2921c
>   r10: 00000002  r9 : c1dda730  r8 : 00000000
>   r7 : e8ff7a00  r6 : 00000000  r5 : 02f9ffa0  r4 : e3710000
>   r3 : 000fdffe  r2 : c1e0ce80  r1 : ebf979a0  r0 : 00000000
>   Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment user
>   Control: 30c5383d  Table: 235c2a80  DAC: fffffffd
>   Process mkfs.ext4 (pid: 123, stack limit = 0x495a22e6)
>   Stack: (0xe376bbe0 to 0xe376c000)
>   ...
>   [<c0602b38>] (zs_map_object) from [<c0bda6a0>] (zram_bvec_rw.constprop.0+0x330/0xa64)
>   [<c0bda6a0>] (zram_bvec_rw.constprop.0) from [<c0bdaf78>] (zram_submit_bio+0x1a4/0x40c)
>   [<c0bdaf78>] (zram_submit_bio) from [<c085806c>] (submit_bio_noacct+0xd0/0x3c8)
>   [<c085806c>] (submit_bio_noacct) from [<c08583b0>] (submit_bio+0x4c/0x190)
>   [<c08583b0>] (submit_bio) from [<c06496b4>] (submit_bh_wbc+0x188/0x1b8)
>   [<c06496b4>] (submit_bh_wbc) from [<c064ce98>] (__block_write_full_page+0x340/0x5e4)
>   [<c064ce98>] (__block_write_full_page) from [<c064d3ec>] (block_write_full_page+0x128/0x170)
>   [<c064d3ec>] (block_write_full_page) from [<c0591ae8>] (__writepage+0x14/0x68)
>   [<c0591ae8>] (__writepage) from [<c0593efc>] (write_cache_pages+0x1bc/0x494)
>   [<c0593efc>] (write_cache_pages) from [<c059422c>] (generic_writepages+0x58/0x8c)
>   [<c059422c>] (generic_writepages) from [<c0594c24>] (do_writepages+0x48/0xec)
>   [<c0594c24>] (do_writepages) from [<c0589330>] (__filemap_fdatawrite_range+0xf0/0x128)
>   [<c0589330>] (__filemap_fdatawrite_range) from [<c05894bc>] (file_write_and_wait_range+0x48/0x98)
>   [<c05894bc>] (file_write_and_wait_range) from [<c064f3f8>] (blkdev_fsync+0x1c/0x44)
>   [<c064f3f8>] (blkdev_fsync) from [<c064408c>] (do_fsync+0x3c/0x70)
>   [<c064408c>] (do_fsync) from [<c0400374>] (__sys_trace_return+0x0/0x2c)
>   Exception stack(0xe376bfa8 to 0xe376bff0)
>   bfa0:                   0003d2e0 b6f7b6f0 00000003 00046e40 00001000 00000000
>   bfc0: 0003d2e0 b6f7b6f0 00000000 00000076 00000000 00000000 befcbb20 befcbb28
>   bfe0: b6f4e060 befcbad8 b6f23e0c b6dc4a80
>   Code: e5927000 e0050391 e0871005 e5918018 (e5983000)
> 
> Fixes: 61989a80fb3a ("staging: zsmalloc: zsmalloc memory allocation library")
> Signed-off-by: Stefan Agner <stefan@...er.ch>
> ---
>  mm/zsmalloc.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
> index c36fdff9a371..260bd48aacd0 100644
> --- a/mm/zsmalloc.c
> +++ b/mm/zsmalloc.c
> @@ -40,6 +40,7 @@
>  #include <linux/string.h>
>  #include <linux/slab.h>
>  #include <linux/pgtable.h>
> +#include <asm/sparsemem.h>

asm/sparsemem.h is not available on some architectures.
It's better to use linux/mmzone.h instead.

>  #include <asm/tlbflush.h>
>  #include <linux/cpumask.h>
>  #include <linux/cpu.h>
> -- 
> 2.29.1
> 
> 

-- 
Sincerely yours,
Mike.