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. 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 4cd5f982b1e5..bf8cc5de918f 100644 --- a/arch/x86/entry/syscalls/syscall_32.tbl +++ b/arch/x86/entry/syscalls/syscall_32.tbl @@ -438,3 +438,4 @@ 425 i386 io_uring_setup sys_io_uring_setup __ia32_sys_io_uring_setup 426 i386 io_uring_enter sys_io_uring_enter __ia32_sys_io_uring_enter 427 i386 io_uring_register sys_io_uring_register __ia32_sys_io_uring_register +428 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 64ca0d06259a..5af619c2d512 100644 --- a/arch/x86/entry/syscalls/syscall_64.tbl +++ b/arch/x86/entry/syscalls/syscall_64.tbl @@ -355,6 +355,7 @@ 425 common io_uring_setup __x64_sys_io_uring_setup 426 common io_uring_enter __x64_sys_io_uring_enter 427 common io_uring_register __x64_sys_io_uring_register +428 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 dee7292e1df6..1273d86bf546 100644 --- a/include/uapi/asm-generic/unistd.h +++ b/include/uapi/asm-generic/unistd.h @@ -832,9 +832,12 @@ __SYSCALL(__NR_io_uring_setup, sys_io_uring_setup) __SYSCALL(__NR_io_uring_enter, sys_io_uring_enter) #define __NR_io_uring_register 427 __SYSCALL(__NR_io_uring_register, sys_io_uring_register) +#define __NR_process_vm_mmap 428 +__SC_COMP(__NR_process_vm_mmap, sys_process_vm_mmap, \ + compat_sys_process_vm_mmap) #undef __NR_syscalls -#define __NR_syscalls 428 +#define __NR_syscalls 429 /* * 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);
