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kexec: new syscall kexec_file_load() declaration

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This is the new syscall kexec_file_load() declaration/interface.  I have
reserved the syscall number only for x86_64 so far.  Other architectures
(including i386) can reserve syscall number when they enable the support
for this new syscall.

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Greg Kroah-Hartman <greg@kroah.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: WANG Chao <chaowang@redhat.com>
Cc: Baoquan He <bhe@redhat.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Vivek Goyal 2014-08-08 14:25:55 -07:00 • committed by Linus Torvalds
parent 815d5704a3
commit f0895685c7
4 changed files with 13 additions and 0 deletions
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1
arch/x86/syscalls/syscall_64.tbl
View file

@ -326,6 +326,7 @@
317 common seccomp sys_seccomp 317 common seccomp sys_seccomp
318 common getrandom sys_getrandom 318 common getrandom sys_getrandom
319 common memfd_create sys_memfd_create 319 common memfd_create sys_memfd_create
320 common kexec_file_load sys_kexec_file_load
# #
# x32-specific system call numbers start at 512 to avoid cache impact # x32-specific system call numbers start at 512 to avoid cache impact

4
include/linux/syscalls.h
View file

@ -317,6 +317,10 @@ asmlinkage long sys_restart_syscall(void);
asmlinkage long sys_kexec_load(unsigned long entry, unsigned long nr_segments, asmlinkage long sys_kexec_load(unsigned long entry, unsigned long nr_segments,
struct kexec_segment __user *segments, struct kexec_segment __user *segments,
unsigned long flags); unsigned long flags);
asmlinkage long sys_kexec_file_load(int kernel_fd, int initrd_fd,
unsigned long cmdline_len,
const char __user *cmdline_ptr,
unsigned long flags);
asmlinkage long sys_exit(int error_code); asmlinkage long sys_exit(int error_code);
asmlinkage long sys_exit_group(int error_code); asmlinkage long sys_exit_group(int error_code);

7
kernel/kexec.c
View file

@ -1058,6 +1058,13 @@ COMPAT_SYSCALL_DEFINE4(kexec_load, compat_ulong_t, entry,
} }
#endif #endif
SYSCALL_DEFINE5(kexec_file_load, int, kernel_fd, int, initrd_fd,
unsigned long, cmdline_len, const char __user *, cmdline_ptr,
unsigned long, flags)
{
return -ENOSYS;
}
void crash_kexec(struct pt_regs *regs) void crash_kexec(struct pt_regs *regs)
{ {
/* Take the kexec_mutex here to prevent sys_kexec_load /* Take the kexec_mutex here to prevent sys_kexec_load

1
kernel/sys_ni.c
View file

@ -25,6 +25,7 @@ cond_syscall(sys_swapon);
cond_syscall(sys_swapoff); cond_syscall(sys_swapoff);
cond_syscall(sys_kexec_load); cond_syscall(sys_kexec_load);
cond_syscall(compat_sys_kexec_load); cond_syscall(compat_sys_kexec_load);
cond_syscall(sys_kexec_file_load);
cond_syscall(sys_init_module); cond_syscall(sys_init_module);
cond_syscall(sys_finit_module); cond_syscall(sys_finit_module);
cond_syscall(sys_delete_module); cond_syscall(sys_delete_module);