On Mon, May 20, 2019 at 05:00:07PM +0300, Kirill Tkhai wrote: > Similar to process_vm_readv() and process_vm_writev(), > add declarations of a new syscall, which will allow > to map memory from or to another process. Shouldn't this be the last patch in the series so that the syscall is actually implemented first? Ira > > Signed-off-by: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx> > --- > arch/x86/entry/syscalls/syscall_32.tbl | 1 + > arch/x86/entry/syscalls/syscall_64.tbl | 2 ++ > include/linux/syscalls.h | 5 +++++ > include/uapi/asm-generic/unistd.h | 5 ++++- > init/Kconfig | 9 +++++---- > kernel/sys_ni.c | 2 ++ > 6 files changed, 19 insertions(+), 5 deletions(-) > > diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl > index ad968b7bac72..99d6e0085576 100644 > --- a/arch/x86/entry/syscalls/syscall_32.tbl > +++ b/arch/x86/entry/syscalls/syscall_32.tbl > @@ -438,3 +438,4 @@ > 431 i386 fsconfig sys_fsconfig __ia32_sys_fsconfig > 432 i386 fsmount sys_fsmount __ia32_sys_fsmount > 433 i386 fspick sys_fspick __ia32_sys_fspick > +434 i386 process_vm_mmap sys_process_vm_mmap __ia32_compat_sys_process_vm_mmap > diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl > index b4e6f9e6204a..46d7d2898f7a 100644 > --- a/arch/x86/entry/syscalls/syscall_64.tbl > +++ b/arch/x86/entry/syscalls/syscall_64.tbl > @@ -355,6 +355,7 @@ > 431 common fsconfig __x64_sys_fsconfig > 432 common fsmount __x64_sys_fsmount > 433 common fspick __x64_sys_fspick > +434 common process_vm_mmap __x64_sys_process_vm_mmap > > # > # x32-specific system call numbers start at 512 to avoid cache impact > @@ -398,3 +399,4 @@ > 545 x32 execveat __x32_compat_sys_execveat/ptregs > 546 x32 preadv2 __x32_compat_sys_preadv64v2 > 547 x32 pwritev2 __x32_compat_sys_pwritev64v2 > +548 x32 process_vm_mmap __x32_compat_sys_process_vm_mmap > diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h > index e2870fe1be5b..7d8ae36589cf 100644 > --- a/include/linux/syscalls.h > +++ b/include/linux/syscalls.h > @@ -997,6 +997,11 @@ asmlinkage long sys_fspick(int dfd, const char __user *path, unsigned int flags) > asmlinkage long sys_pidfd_send_signal(int pidfd, int sig, > siginfo_t __user *info, > unsigned int flags); > +asmlinkage long sys_process_vm_mmap(pid_t pid, > + unsigned long src_addr, > + unsigned long len, > + unsigned long dst_addr, > + unsigned long flags); > > /* > * Architecture-specific system calls > diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h > index a87904daf103..b7aaa5ae02da 100644 > --- a/include/uapi/asm-generic/unistd.h > +++ b/include/uapi/asm-generic/unistd.h > @@ -844,9 +844,12 @@ __SYSCALL(__NR_fsconfig, sys_fsconfig) > __SYSCALL(__NR_fsmount, sys_fsmount) > #define __NR_fspick 433 > __SYSCALL(__NR_fspick, sys_fspick) > +#define __NR_process_vm_mmap 424 > +__SC_COMP(__NR_process_vm_mmap, sys_process_vm_mmap, \ > + compat_sys_process_vm_mmap) > > #undef __NR_syscalls > -#define __NR_syscalls 434 > +#define __NR_syscalls 435 > > /* > * 32 bit systems traditionally used different > diff --git a/init/Kconfig b/init/Kconfig > index 8b9ffe236e4f..604db5f14718 100644 > --- a/init/Kconfig > +++ b/init/Kconfig > @@ -320,13 +320,14 @@ config POSIX_MQUEUE_SYSCTL > default y > > config CROSS_MEMORY_ATTACH > - bool "Enable process_vm_readv/writev syscalls" > + bool "Enable process_vm_readv/writev/mmap syscalls" > depends on MMU > default y > help > - Enabling this option adds the system calls process_vm_readv and > - process_vm_writev which allow a process with the correct privileges > - to directly read from or write to another process' address space. > + Enabling this option adds the system calls process_vm_readv, > + process_vm_writev and process_vm_mmap, which allow a process > + with the correct privileges to directly read from or write to > + or mmap another process' address space. > See the man page for more details. > > config USELIB > diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c > index 4d9ae5ea6caf..6f51634f4f7e 100644 > --- a/kernel/sys_ni.c > +++ b/kernel/sys_ni.c > @@ -316,6 +316,8 @@ COND_SYSCALL(process_vm_readv); > COND_SYSCALL_COMPAT(process_vm_readv); > COND_SYSCALL(process_vm_writev); > COND_SYSCALL_COMPAT(process_vm_writev); > +COND_SYSCALL(process_vm_mmap); > +COND_SYSCALL_COMPAT(process_vm_mmap); > > /* compare kernel pointers */ > COND_SYSCALL(kcmp); >
