linux-kernel - [PATCH 1/3] x86/crash: Correct the address boundary of function parameters

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Message-Id: <20200804044933.1973-2-lijiang@redhat.com>
Date:   Tue,  4 Aug 2020 12:49:31 +0800
From:   Lianbo Jiang <lijiang@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     kexec@...ts.infradead.org, tglx@...utronix.de, bp@...en8.de,
        mingo@...hat.com, x86@...nel.org, hpa@...or.com, dyoung@...hat.com,
        bhe@...hat.com, k-hagio@...jp.nec.com
Subject: [PATCH 1/3] x86/crash: Correct the address boundary of function parameters

Let's carefully handle the boundary of the function parameter to make
sure that the arguments passed doesn't exceed the address range.

Signed-off-by: Lianbo Jiang <lijiang@...hat.com>
---
 arch/x86/kernel/crash.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/crash.c b/arch/x86/kernel/crash.c
index fd87b59452a3..a8f3af257e26 100644
--- a/arch/x86/kernel/crash.c
+++ b/arch/x86/kernel/crash.c
@@ -230,7 +230,7 @@ static int elf_header_exclude_ranges(struct crash_mem *cmem)
 	int ret = 0;
 
 	/* Exclude the low 1M because it is always reserved */
-	ret = crash_exclude_mem_range(cmem, 0, 1<<20);
+	ret = crash_exclude_mem_range(cmem, 0, (1<<20)-1);
 	if (ret)
 		return ret;
 
-- 
2.17.1