[PATCH v15 10/11] arch, mm: wire up memfd_secret system call where relevant
From: Mike Rapoport <rppt@kernel.org>
Date: 2021-01-20 18:12:01
Also in:
linux-api, linux-arch, linux-fsdevel, linux-kselftest, linux-mm, linux-riscv, lkml, nvdimm
Subsystem:
abi/api, arm64 port (aarch64 architecture), generic include/asm header files, memory management, memory management - secretmem, risc-v architecture, the rest, x86 architecture (32-bit and 64-bit), x86 entry code · Maintainers:
Catalin Marinas, Will Deacon, Arnd Bergmann, Andrew Morton, Mike Rapoport, Paul Walmsley, Palmer Dabbelt, Albert Ou, Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen, Andy Lutomirski
From: Mike Rapoport <redacted> Wire up memfd_secret system call on architectures that define ARCH_HAS_SET_DIRECT_MAP, namely arm64, risc-v and x86. Signed-off-by: Mike Rapoport <redacted> Acked-by: Palmer Dabbelt <redacted> Acked-by: Arnd Bergmann <arnd@arndb.de> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Christopher Lameter <redacted> Cc: Dan Williams <redacted> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: David Hildenbrand <redacted> Cc: Elena Reshetova <elena.reshetova@intel.com> Cc: Hagen Paul Pfeifer <redacted> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: James Bottomley <redacted> Cc: "Kirill A. Shutemov" <redacted> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Michael Kerrisk <redacted> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Paul Walmsley <redacted> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rick Edgecombe <rick.p.edgecombe@intel.com> Cc: Roman Gushchin <redacted> Cc: Shakeel Butt <redacted> Cc: Shuah Khan <shuah@kernel.org> Cc: Thomas Gleixner <redacted> Cc: Tycho Andersen <redacted> Cc: Will Deacon <will@kernel.org> --- arch/arm64/include/uapi/asm/unistd.h | 1 + arch/riscv/include/asm/unistd.h | 1 + arch/x86/entry/syscalls/syscall_32.tbl | 1 + arch/x86/entry/syscalls/syscall_64.tbl | 1 + include/linux/syscalls.h | 1 + include/uapi/asm-generic/unistd.h | 6 +++++- mm/secretmem.c | 3 +++ scripts/checksyscalls.sh | 4 ++++ 8 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/uapi/asm/unistd.h b/arch/arm64/include/uapi/asm/unistd.h
index f83a70e07df8..ce2ee8f1e361 100644
--- a/arch/arm64/include/uapi/asm/unistd.h
+++ b/arch/arm64/include/uapi/asm/unistd.h@@ -20,5 +20,6 @@ #define __ARCH_WANT_SET_GET_RLIMIT #define __ARCH_WANT_TIME32_SYSCALLS #define __ARCH_WANT_SYS_CLONE3 +#define __ARCH_WANT_MEMFD_SECRET #include <asm-generic/unistd.h>
diff --git a/arch/riscv/include/asm/unistd.h b/arch/riscv/include/asm/unistd.h
index 977ee6181dab..6c316093a1e5 100644
--- a/arch/riscv/include/asm/unistd.h
+++ b/arch/riscv/include/asm/unistd.h@@ -9,6 +9,7 @@ */ #define __ARCH_WANT_SYS_CLONE +#define __ARCH_WANT_MEMFD_SECRET #include <uapi/asm/unistd.h>
diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
index 02a349afaf9c..a1578cdf6d91 100644
--- a/arch/x86/entry/syscalls/syscall_32.tbl
+++ b/arch/x86/entry/syscalls/syscall_32.tbl@@ -447,3 +447,4 @@ 440 i386 process_madvise sys_process_madvise 441 i386 epoll_pwait2 sys_epoll_pwait2 compat_sys_epoll_pwait2 442 i386 watch_mount sys_watch_mount +443 i386 memfd_secret sys_memfd_secret
diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl
index d9bcc4e02588..d8ecd9df0942 100644
--- a/arch/x86/entry/syscalls/syscall_64.tbl
+++ b/arch/x86/entry/syscalls/syscall_64.tbl@@ -364,6 +364,7 @@ 440 common process_madvise sys_process_madvise 441 common epoll_pwait2 sys_epoll_pwait2 442 common watch_mount sys_watch_mount +443 common memfd_secret sys_memfd_secret # # Due to a historical design error, certain syscalls are numbered differently
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 28bde029109d..4bc70ac0e993 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h@@ -1039,6 +1039,7 @@ asmlinkage long sys_pidfd_send_signal(int pidfd, int sig, asmlinkage long sys_pidfd_getfd(int pidfd, int fd, unsigned int flags); asmlinkage long sys_watch_mount(int dfd, const char __user *path, unsigned int at_flags, int watch_fd, int watch_id); +asmlinkage long sys_memfd_secret(unsigned long flags); /* * Architecture-specific system calls
diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index ad58f661f4aa..26125974a8a2 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h@@ -863,9 +863,13 @@ __SYSCALL(__NR_process_madvise, sys_process_madvise) __SC_COMP(__NR_epoll_pwait2, sys_epoll_pwait2, compat_sys_epoll_pwait2) #define __NR_watch_mount 442 __SYSCALL(__NR_watch_mount, sys_watch_mount) +#ifdef __ARCH_WANT_MEMFD_SECRET +#define __NR_memfd_secret 443 +__SYSCALL(__NR_memfd_secret, sys_memfd_secret) +#endif #undef __NR_syscalls -#define __NR_syscalls 443 +#define __NR_syscalls 444 /* * 32 bit systems traditionally used different
diff --git a/mm/secretmem.c b/mm/secretmem.c
index 2de06446ebf9..6f75c0c69c70 100644
--- a/mm/secretmem.c
+++ b/mm/secretmem.c@@ -420,6 +420,9 @@ static int __init secretmem_setup(char *str) unsigned long reserved_size; int err; + if (!can_set_direct_map()) + return 0; + reserved_size = memparse(str, NULL); if (!reserved_size) return 0;
diff --git a/scripts/checksyscalls.sh b/scripts/checksyscalls.sh
index a18b47695f55..b7609958ee36 100755
--- a/scripts/checksyscalls.sh
+++ b/scripts/checksyscalls.sh@@ -40,6 +40,10 @@ cat << EOF #define __IGNORE_setrlimit /* setrlimit */ #endif +#ifndef __ARCH_WANT_MEMFD_SECRET +#define __IGNORE_memfd_secret +#endif + /* Missing flags argument */ #define __IGNORE_renameat /* renameat2 */
--
2.28.0
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