From: Qian Cai <cai@gmx.us>
To: akpm@linux-foundation.org
Cc: ard.biesheuvel@linaro.org, catalin.marinas@arm.com,
marc.zyngier@arm.com, linux-efi@vger.kernel.org,
linux-kernel@vger.kernel.org, Qian Cai <cai@gmx.us>
Subject: [RESEND PATCH] efi: let kmemleak ignore false positives
Date: Thu, 6 Dec 2018 11:16:33 -0500 [thread overview]
Message-ID: <20181206161633.36292-1-cai@gmx.us> (raw)
In-Reply-To: <1543517152-23969-1-git-send-email-cai@gmx.us>
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>
---
drivers/firmware/efi/efi.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/firmware/efi/efi.c b/drivers/firmware/efi/efi.c
index 415849bab233..7fcfe8a7ae98 100644
--- a/drivers/firmware/efi/efi.c
+++ b/drivers/firmware/efi/efi.c
@@ -31,6 +31,7 @@
#include <linux/acpi.h>
#include <linux/ucs2_string.h>
#include <linux/memblock.h>
+#include <linux/kmemleak.h>
#include <asm/early_ioremap.h>
@@ -1000,6 +1001,8 @@ int __ref efi_mem_reserve_persistent(phys_addr_t addr, u64 size)
if (!rsv)
return -ENOMEM;
+ kmemleak_ignore(rsv);
+
rsv->base = addr;
rsv->size = size;
--
2.17.2 (Apple Git-113)
next prev parent reply other threads:[~2018-12-06 16:17 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-29 18:45 [PATCH] efi: let kmemleak ignore false positives Qian Cai
2018-12-06 16:16 ` Qian Cai [this message]
2018-12-06 17:59 ` [RESEND PATCH] " Catalin Marinas
2018-12-06 18:01 ` Ard Biesheuvel
2018-12-06 18:04 ` Qian Cai
2018-12-07 11:28 ` Ard Biesheuvel
2018-12-07 12:32 ` Qian Cai
2018-12-07 12:45 ` Ard Biesheuvel
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