Re: [PATCH v8 2/5] arm64: Tighten the PR_{SET,GET}_TAGGED_ADDR_CTRL prctl() unused arguments
From: Andrey Konovalov <hidden>
Date: 2019-08-19 15:46:26
Also in:
linux-arch, linux-doc, linux-mm
On Thu, Aug 15, 2019 at 5:44 PM Catalin Marinas [off-list ref] wrote:
Require that arg{3,4,5} of the PR_{SET,GET}_TAGGED_ADDR_CTRL prctl and
arg2 of the PR_GET_TAGGED_ADDR_CTRL prctl() are zero rather than ignored
for future extensions.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>Acked-by: Andrey Konovalov <redacted>
quoted hunk ↗ jump to hunk
--- kernel/sys.c | 4 ++++ 1 file changed, 4 insertions(+)diff --git a/kernel/sys.c b/kernel/sys.c index c6c4d5358bd3..ec48396b4943 100644 --- a/kernel/sys.c +++ b/kernel/sys.c@@ -2499,9 +2499,13 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, error = PAC_RESET_KEYS(me, arg2); break; case PR_SET_TAGGED_ADDR_CTRL: + if (arg3 || arg4 || arg5) + return -EINVAL; error = SET_TAGGED_ADDR_CTRL(arg2); break; case PR_GET_TAGGED_ADDR_CTRL: + if (arg2 || arg3 || arg4 || arg5) + return -EINVAL; error = GET_TAGGED_ADDR_CTRL(); break; default:
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