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| author | Catalin Marinas <catalin.marinas@arm.com> | 2019-08-15 16:44:00 +0100 |
|---|---|---|
| committer | Will Deacon <will@kernel.org> | 2019-08-20 18:17:55 +0100 |
| commit | 3e91ec89f527b9870fe42dcbdb74fd389d123a95 (patch) | |
| tree | 9b384e277452dacf60078c979b87c780bbc0cc97 | |
| parent | 74585fcb7b3ccb35135e2418dd66251022a916e5 (diff) | |
| download | lwn-3e91ec89f527b9870fe42dcbdb74fd389d123a95.tar.gz lwn-3e91ec89f527b9870fe42dcbdb74fd389d123a95.zip | |
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>
| -rw-r--r-- | kernel/sys.c | 4 |
1 files changed, 4 insertions, 0 deletions
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: |