diff options
| author | Mark Rutland <mark.rutland@arm.com> | 2018-07-11 14:56:50 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-07-12 14:49:48 +0100 |
| commit | bf1c77b4644f46d2986b7ca5e43e012f0fc8984b (patch) | |
| tree | dc904b18b02cbab1c85d6bd336869837e410ffe3 /include | |
| parent | 80d63bc39f9ace9c1d2bef7f921d2f3ef2037d4b (diff) | |
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/syscalls.h | 11 |
1 files changed, 11 insertions, 0 deletions
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 |