redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

kernel: add ksys_personality() 

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>
Signed-off-by: Will Deacon <will.deacon@arm.com>
hifive-unleashed-5.1
Mark Rutland 2018-07-11 14:56:50 +01:00 committed by Will Deacon
parent 80d63bc39f
commit bf1c77b464
1 changed files with 11 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
include/linux/syscalls.h
View File

@ -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