[tip: x86/urgent] x86/crash: Correct the address boundary of function parameters

[tip-bot2 for Lianbo Jiang]

The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     5b89a35f8c11a7846b06ac729d7de72044f7fc60
Gitweb:        https://git.kernel.org/tip/5b89a35f8c11a7846b06ac729d7de72044f7fc60
Author:        Lianbo Jiang <lijiang@xxxxxxxxxx>
AuthorDate:    Tue, 04 Aug 2020 12:49:31 +08:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Thu, 06 Aug 2020 15:25:58 +02:00

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@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Acked-by: Dave Young <dyoung@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20200804044933.1973-2-lijiang@xxxxxxxxxx
---
 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 fd87b59..a8f3af2 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;