linux-kernel - Re: [PATCH v2] bpf: Fix integer overflow in prealloc_elems_and

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Date:   Thu, 30 Sep 2021 16:20:07 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Tatsuhiko Yasumatsu <th.yasumatsu@...il.com>
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        kafai@...com, songliubraving@...com, yhs@...com,
        john.fastabend@...il.com, kpsingh@...nel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] bpf: Fix integer overflow in prealloc_elems_and_freelist()

Hello:

This patch was applied to bpf/bpf.git (refs/heads/master):

On Thu, 30 Sep 2021 22:55:45 +0900 you wrote:
> In prealloc_elems_and_freelist(), the multiplication to calculate the
> size passed to bpf_map_area_alloc() could lead to an integer overflow.
> As a result, out-of-bounds write could occur in pcpu_freelist_populate()
> as reported by KASAN:
> 
> [...]
> [   16.968613] BUG: KASAN: slab-out-of-bounds in pcpu_freelist_populate+0xd9/0x100
> [   16.969408] Write of size 8 at addr ffff888104fc6ea0 by task crash/78
> [   16.970038]
> [   16.970195] CPU: 0 PID: 78 Comm: crash Not tainted 5.15.0-rc2+ #1
> [   16.970878] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014
> [   16.972026] Call Trace:
> [   16.972306]  dump_stack_lvl+0x34/0x44
> [   16.972687]  print_address_description.constprop.0+0x21/0x140
> [   16.973297]  ? pcpu_freelist_populate+0xd9/0x100
> [   16.973777]  ? pcpu_freelist_populate+0xd9/0x100
> [   16.974257]  kasan_report.cold+0x7f/0x11b
> [   16.974681]  ? pcpu_freelist_populate+0xd9/0x100
> [   16.975190]  pcpu_freelist_populate+0xd9/0x100
> [   16.975669]  stack_map_alloc+0x209/0x2a0
> [   16.976106]  __sys_bpf+0xd83/0x2ce0
> [...]
> 
> [...]

Here is the summary with links:
  - [v2] bpf: Fix integer overflow in prealloc_elems_and_freelist()
    https://git.kernel.org/bpf/bpf/c/30e29a9a2bc6

You are awesome, thank you!
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