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Subject[tip: x86/urgent] x86/crash: Correct the address boundary of function parameters
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@redhat.com>
AuthorDate: Tue, 04 Aug 2020 12:49:31 +08:00
Committer: Ingo Molnar <mingo@kernel.org>
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@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Acked-by: Dave Young <dyoung@redhat.com>
Link: https://lore.kernel.org/r/20200804044933.1973-2-lijiang@redhat.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 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;

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