lkml.org 
[lkml]   [2018]   [Dec]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RESEND PATCH] efi: let kmemleak ignore false positives
On Thu, Dec 06, 2018 at 11:16:33AM -0500, Qian Cai wrote:
> unreferenced object 0xffff8096c1acf580 (size 128):
> comm "swapper/63", pid 0, jiffies 4294937418 (age 1201.230s)
> hex dump (first 32 bytes):
> 80 87 b5 c1 96 00 00 00 00 00 cc c2 16 00 00 00 ................
> 00 00 01 00 00 00 00 00 6b 6b 6b 6b 6b 6b 6b 6b ........kkkkkkkk
> backtrace:
> [<000000001d2549ba>] kmem_cache_alloc_trace+0x430/0x500
> [<0000000093a6dfab>] efi_mem_reserve_persistent+0x50/0xf8
> [<000000000a730828>] its_cpu_init_lpis+0x394/0x4b8
> [<00000000edf04e07>] its_cpu_init+0x104/0x150
> [<000000004d0342c5>] gic_starting_cpu+0x34/0x40
> [<000000005d9da772>] cpuhp_invoke_callback+0x228/0x1d68
> [<0000000061eace9b>] notify_cpu_starting+0xc0/0x118
> [<0000000048bc2dc5>] secondary_start_kernel+0x23c/0x3b0
> [<0000000015137d6a>] 0xffffffffffffffff
>
> efi_mem_reserve_persistent+0x50/0xf8:
> kmalloc at include/linux/slab.h:546
> (inlined by) efi_mem_reserve_persistent at drivers/firmware/efi/efi.c:979
>
> This line,
>
> rsv = kmalloc(sizeof(*rsv), GFP_ATOMIC);
>
> Kmemleak has a known limitation that can only track pointers in the kernel
> virtual space. Hence, it will report false positives due to "rsv" will only
> reference to other physical addresses,
>
> rsv->next = efi_memreserve_root->next;
> efi_memreserve_root->next = __pa(rsv);
>
> Signed-off-by: Qian Cai <cai@gmx.us>

Acked-by: Catalin Marinas <catalin.marinas@arm.com>

\
 
 \ /
  Last update: 2018-12-06 19:00    [W:0.120 / U:17.200 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site