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arm64: Tighten the PR_{SET, GET}_TAGGED_ADDR_CTRL prctl() unused arguments 

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.

Acked-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Catalin Marinas 2019-08-15 16:44:00 +01:00 committed by Will Deacon
parent 74585fcb7b
commit 3e91ec89f5
1 changed files with 4 additions and 0 deletions
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4
kernel/sys.c
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@ -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: