From: Catalin Marinas <catalin.marinas@arm.com>
To: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org
Cc: Andrew Morton <akpm@linux-foundation.org>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Will Deacon <will.deacon@arm.com>,
Andrey Konovalov <andreyknvl@google.com>,
Szabolcs Nagy <szabolcs.nagy@arm.com>,
Kevin Brodsky <kevin.brodsky@arm.com>,
Dave P Martin <Dave.Martin@arm.com>,
Dave Hansen <dave.hansen@intel.com>,
linux-doc@vger.kernel.org, linux-arch@vger.kernel.org
Subject: [PATCH v8 2/5] arm64: Tighten the PR_{SET,GET}_TAGGED_ADDR_CTRL prctl() unused arguments
Date: Thu, 15 Aug 2019 16:44:00 +0100 [thread overview]
Message-ID: <20190815154403.16473-3-catalin.marinas@arm.com> (raw)
In-Reply-To: <20190815154403.16473-1-catalin.marinas@arm.com>
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>
---
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:
next prev parent reply other threads:[~2019-08-15 15:44 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-15 15:43 [PATCH v8 0/2] arm64 tagged address ABI Catalin Marinas
2019-08-15 15:43 ` [PATCH v8 1/5] mm: untag user pointers in mmap/munmap/mremap/brk Catalin Marinas
2019-08-19 15:45 ` Andrey Konovalov
2019-08-19 16:28 ` Will Deacon
2019-08-22 23:41 ` Andrew Morton
2019-08-23 15:01 ` Will Deacon
2019-08-15 15:44 ` Catalin Marinas [this message]
2019-08-19 15:46 ` [PATCH v8 2/5] arm64: Tighten the PR_{SET,GET}_TAGGED_ADDR_CTRL prctl() unused arguments Andrey Konovalov
2019-08-15 15:44 ` [PATCH v8 3/5] arm64: Change the tagged_addr sysctl control semantics to only prevent the opt-in Catalin Marinas
2019-08-19 15:47 ` Andrey Konovalov
2019-08-15 15:44 ` [PATCH v8 4/5] arm64: Define Documentation/arm64/tagged-address-abi.rst Catalin Marinas
2019-08-15 16:54 ` Kevin Brodsky
2019-08-19 15:50 ` Andrey Konovalov
2019-08-19 16:25 ` Will Deacon
2019-08-15 15:44 ` [PATCH v8 5/5] arm64: Relax Documentation/arm64/tagged-pointers.rst Catalin Marinas
2019-08-19 15:48 ` Andrey Konovalov
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