From mboxrd@z Thu Jan 1 00:00:00 1970 From: mark.rutland@arm.com (Mark Rutland) Date: Mon, 14 May 2018 10:46:34 +0100 Subject: [PATCH 12/18] kernel: add ksys_personality() In-Reply-To: <20180514094640.27569-1-mark.rutland@arm.com> References: <20180514094640.27569-1-mark.rutland@arm.com> Message-ID: <20180514094640.27569-13-mark.rutland@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org 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(). This is necessary to enable conversion of arm64's syscall handling to use pt_regs wrappers. Signed-off-by: Mark Rutland Cc: Al Viro Cc: Dominik Brodowski --- include/linux/syscalls.h | 1 + kernel/exec_domain.c | 7 ++++++- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h index 70fcda1a9049..6723ea51ec99 100644 --- a/include/linux/syscalls.h +++ b/include/linux/syscalls.h @@ -1148,6 +1148,7 @@ unsigned long ksys_mmap_pgoff(unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long fd, unsigned long pgoff); ssize_t ksys_readahead(int fd, loff_t offset, size_t count); +unsigned int ksys_personality(unsigned int personality); /* * The following kernel syscall equivalents are just wrappers to fs-internal diff --git a/kernel/exec_domain.c b/kernel/exec_domain.c index a5697119290e..4ba2b404cba2 100644 --- a/kernel/exec_domain.c +++ b/kernel/exec_domain.c @@ -47,7 +47,7 @@ static int __init proc_execdomains_init(void) module_init(proc_execdomains_init); #endif -SYSCALL_DEFINE1(personality, unsigned int, personality) +unsigned int ksys_personality(unsigned int personality) { unsigned int old = current->personality; @@ -56,3 +56,8 @@ SYSCALL_DEFINE1(personality, unsigned int, personality) return old; } + +SYSCALL_DEFINE1(personality, unsigned int, personality) +{ + return ksys_personality(personality); +} -- 2.11.0