From: Mark Rutland <mark.rutland@arm.com>
To: linux-arm-kernel@lists.infradead.org, will.deacon@arm.com
Cc: linux-kernel@vger.kernel.org, catalin.marinas@arm.com,
dave.martin@arm.com, hch@infradead.org, james.morse@arm.com,
linux@dominikbrodowski.net, linux-fsdevel@vger.kernel.org,
marc.zyngier@arm.com, mark.rutland@arm.com,
viro@zeniv.linux.org.uk
Subject: [PATCHv4 13/19] kernel: add ksys_personality()
Date: Mon, 2 Jul 2018 12:04:09 +0100 [thread overview]
Message-ID: <20180702110415.10465-14-mark.rutland@arm.com> (raw)
In-Reply-To: <20180702110415.10465-1-mark.rutland@arm.com>
Using this helper allows us to avoid the in-kernel call to the
sys_personality() syscall. The ksys_ prefix denotes that this function
is meant as a drop-in replacement for the syscall. In particular, it
uses the same calling convention as sys_personality().
Since ksys_personality is trivial, it is implemented directly in
<linux/syscalls.h>, as we do for ksys_close() and friends.
This helper is necessary to enable conversion of arm64's syscall
handling to use pt_regs wrappers.
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Dave Martin <dave.martin@arm.com>
---
include/linux/syscalls.h | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index a368a68cb667..abfe12d8a9c5 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -80,6 +80,7 @@ union bpf_attr;
#include <linux/unistd.h>
#include <linux/quota.h>
#include <linux/key.h>
+#include <linux/personality.h>
#include <trace/syscall.h>
#ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
@@ -1281,4 +1282,14 @@ static inline long ksys_truncate(const char __user *pathname, loff_t length)
return do_sys_truncate(pathname, length);
}
+static inline unsigned int ksys_personality(unsigned int personality)
+{
+ unsigned int old = current->personality;
+
+ if (personality != 0xffffffff)
+ set_personality(personality);
+
+ return old;
+}
+
#endif
--
2.11.0
next prev parent reply other threads:[~2018-07-02 11:04 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-02 11:03 [PATCHv4 00/19] arm64: invoke syscalls with pt_regs Mark Rutland
2018-07-02 11:03 ` [PATCHv4 01/19] arm64: consistently use unsigned long for thread flags Mark Rutland
2018-07-02 11:03 ` [PATCHv4 02/19] arm64: move SCTLR_EL{1,2} assertions to <asm/sysreg.h> Mark Rutland
2018-07-02 11:03 ` [PATCHv4 03/19] arm64: kill config_sctlr_el1() Mark Rutland
2018-07-02 11:04 ` [PATCHv4 04/19] arm64: kill change_cpacr() Mark Rutland
2018-07-02 11:04 ` [PATCHv4 05/19] arm64: move sve_user_{enable,disable} to <asm/fpsimd.h> Mark Rutland
2018-07-02 11:04 ` [PATCHv4 06/19] arm64: remove sigreturn wrappers Mark Rutland
2018-07-02 11:04 ` [PATCHv4 07/19] arm64: convert raw syscall invocation to C Mark Rutland
2018-07-02 11:04 ` [PATCHv4 08/19] arm64: convert syscall trace logic " Mark Rutland
2018-07-02 11:04 ` [PATCHv4 09/19] arm64: convert native/compat syscall entry " Mark Rutland
2018-07-02 11:04 ` [PATCHv4 10/19] arm64: don't restore GPRs when context tracking Mark Rutland
2018-07-02 11:04 ` [PATCHv4 11/19] arm64: don't reload GPRs after apply_ssbd Mark Rutland
2018-07-06 16:38 ` Will Deacon
2018-07-09 14:21 ` Mark Rutland
2018-07-10 10:37 ` Dave Martin
2018-07-10 17:33 ` Will Deacon
2018-07-11 9:46 ` Mark Rutland
2018-07-02 11:04 ` [PATCHv4 12/19] arm64: zero GPRs upon entry from EL0 Mark Rutland
2018-07-02 11:04 ` Mark Rutland [this message]
2018-07-02 11:04 ` [PATCHv4 14/19] kernel: add kcompat_sys_{f,}statfs64() Mark Rutland
2018-07-02 11:04 ` [PATCHv4 15/19] arm64: remove in-kernel call to sys_personality() Mark Rutland
2018-07-02 11:04 ` [PATCHv4 16/19] arm64: use {COMPAT,}SYSCALL_DEFINE0 for sigreturn Mark Rutland
2018-07-02 11:04 ` [PATCHv4 17/19] arm64: use SYSCALL_DEFINE6() for mmap Mark Rutland
2018-07-02 11:04 ` [PATCHv4 18/19] arm64: convert compat wrappers to C Mark Rutland
2018-07-02 11:04 ` [PATCHv4 19/19] arm64: implement syscall wrappers Mark Rutland
2018-07-06 16:42 ` [PATCHv4 00/19] arm64: invoke syscalls with pt_regs Will Deacon
2018-07-10 10:39 ` Will Deacon
2018-07-11 10:47 ` Mark Rutland
2018-07-11 12:27 ` Will Deacon
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