[PATCHv5 1/5] actual sys_indirect code
This is the actual architecture-independent part of the system call
implementation.
include/linux/indirect.h | 17 +
include/linux/sched.h|4
include/linux/syscalls.h |4
kernel/Makefile |3 +++
kernel/indirect.c| 40
5 files changed, 68 insertions(+)
diff -u linux/include/linux/indirect.h linux/include/linux/indirect.h
--- linux/include/linux/indirect.h
+++ linux/include/linux/indirect.h
@@ -0,0 +1,17 @@
+#ifndef _LINUX_INDIRECT_H
+#define _LINUX_INDIRECT_H
+
+#include
+
+
+/* IMPORTANT:
+ All the elements of this union must be neutral to the word size
+ and must not require reworking when used in compat syscalls. Used
+ fixed-size types or types which are known to not vary in size across
+ architectures. */
+union indirect_params {
+};
+
+#define INDIRECT_PARAM(set, name) current->indirect_params.set.name
+
+#endif
diff -u linux/kernel/Makefile linux/kernel/Makefile
--- linux/kernel/Makefile
+++ linux/kernel/Makefile
@@ -57,6 +57,7 @@
obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o
obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o
obj-$(CONFIG_MARKERS) += marker.o
+obj-$(CONFIG_ARCH_HAS_INDIRECT_SYSCALLS) += indirect.o
ifneq ($(CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER),y)
# According to Alan Modra <[EMAIL PROTECTED]>, the -fno-omit-frame-pointer is
@@ -67,6 +68,8 @@
CFLAGS_sched.o := $(PROFILING) -fno-omit-frame-pointer
endif
+CFLAGS_indirect.o = -Wno-undef
+
$(obj)/configs.o: $(obj)/config_data.h
# config_data.h contains the same information as ikconfig.h but gzipped.
diff -u linux/kernel/indirect.c linux/kernel/indirect.c
--- linux/kernel/indirect.c
+++ linux/kernel/indirect.c
@@ -0,0 +1,40 @@
+#include
+#include
+#include
+#include
+
+
+asmlinkage long sys_indirect(struct indirect_registers __user *userregs,
+void __user *userparams, size_t paramslen,
+int flags)
+{
+ struct indirect_registers regs;
+ long result;
+
+ if (unlikely(flags != 0))
+ return -EINVAL;
+
+ if (copy_from_user(, userregs, sizeof(regs)))
+ return -EFAULT;
+
+ switch (INDIRECT_SYSCALL ())
+ {
+#define INDSYSCALL(name) __NR_##name
+#include
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ if (paramslen > sizeof(union indirect_params))
+ return -EINVAL;
+
+ result = -EFAULT;
+ if (!copy_from_user(>indirect_params, userparams, paramslen))
+ result = call_indirect();
+
+ memset(>indirect_params, '\0', paramslen);
+
+ return result;
+}
diff -u linux/include/linux/syscalls.h linux/include/linux/syscalls.h
--- linux/include/linux/syscalls.h
+++ linux/include/linux/syscalls.h
@@ -54,6 +54,7 @@
struct compat_timeval;
struct robust_list_head;
struct getcpu_cache;
+struct indirect_registers;
#include
#include
@@ -611,6 +612,9 @@
const struct itimerspec __user *utmr);
asmlinkage long sys_eventfd(unsigned int count);
asmlinkage long sys_fallocate(int fd, int mode, loff_t offset, loff_t len);
+asmlinkage long sys_indirect(struct indirect_registers __user *userregs,
+void __user *userparams, size_t paramslen,
+int flags);
int kernel_execve(const char *filename, char *const argv[], char *const
envp[]);
--- linux/include/linux/sched.h
+++ linux/include/linux/sched.h
@@ -80,6 +80,7 @@ struct sched_param {
#include
#include
#include
+#include
#include
#include
@@ -1174,6 +1175,9 @@ struct task_struct {
int make_it_fail;
#endif
struct prop_local_single dirties;
+
+ /* Additional system call parameters. */
+ union indirect_params indirect_params;
};
/*
-
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[PATCHv5 1/5] actual sys_indirect code
This is the actual architecture-independent part of the system call
implementation.
include/linux/indirect.h | 17 +
include/linux/sched.h|4
include/linux/syscalls.h |4
kernel/Makefile |3 +++
kernel/indirect.c| 40
5 files changed, 68 insertions(+)
diff -u linux/include/linux/indirect.h linux/include/linux/indirect.h
--- linux/include/linux/indirect.h
+++ linux/include/linux/indirect.h
@@ -0,0 +1,17 @@
+#ifndef _LINUX_INDIRECT_H
+#define _LINUX_INDIRECT_H
+
+#include asm/indirect.h
+
+
+/* IMPORTANT:
+ All the elements of this union must be neutral to the word size
+ and must not require reworking when used in compat syscalls. Used
+ fixed-size types or types which are known to not vary in size across
+ architectures. */
+union indirect_params {
+};
+
+#define INDIRECT_PARAM(set, name) current-indirect_params.set.name
+
+#endif
diff -u linux/kernel/Makefile linux/kernel/Makefile
--- linux/kernel/Makefile
+++ linux/kernel/Makefile
@@ -57,6 +57,7 @@
obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o
obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o
obj-$(CONFIG_MARKERS) += marker.o
+obj-$(CONFIG_ARCH_HAS_INDIRECT_SYSCALLS) += indirect.o
ifneq ($(CONFIG_SCHED_NO_NO_OMIT_FRAME_POINTER),y)
# According to Alan Modra [EMAIL PROTECTED], the -fno-omit-frame-pointer is
@@ -67,6 +68,8 @@
CFLAGS_sched.o := $(PROFILING) -fno-omit-frame-pointer
endif
+CFLAGS_indirect.o = -Wno-undef
+
$(obj)/configs.o: $(obj)/config_data.h
# config_data.h contains the same information as ikconfig.h but gzipped.
diff -u linux/kernel/indirect.c linux/kernel/indirect.c
--- linux/kernel/indirect.c
+++ linux/kernel/indirect.c
@@ -0,0 +1,40 @@
+#include linux/sched.h
+#include linux/uaccess.h
+#include linux/unistd.h
+#include asm/asm-offsets.h
+
+
+asmlinkage long sys_indirect(struct indirect_registers __user *userregs,
+void __user *userparams, size_t paramslen,
+int flags)
+{
+ struct indirect_registers regs;
+ long result;
+
+ if (unlikely(flags != 0))
+ return -EINVAL;
+
+ if (copy_from_user(regs, userregs, sizeof(regs)))
+ return -EFAULT;
+
+ switch (INDIRECT_SYSCALL (regs))
+ {
+#define INDSYSCALL(name) __NR_##name
+#include linux/indirect.h
+ break;
+
+ default:
+ return -EINVAL;
+ }
+
+ if (paramslen sizeof(union indirect_params))
+ return -EINVAL;
+
+ result = -EFAULT;
+ if (!copy_from_user(current-indirect_params, userparams, paramslen))
+ result = call_indirect(regs);
+
+ memset(current-indirect_params, '\0', paramslen);
+
+ return result;
+}
diff -u linux/include/linux/syscalls.h linux/include/linux/syscalls.h
--- linux/include/linux/syscalls.h
+++ linux/include/linux/syscalls.h
@@ -54,6 +54,7 @@
struct compat_timeval;
struct robust_list_head;
struct getcpu_cache;
+struct indirect_registers;
#include linux/types.h
#include linux/aio_abi.h
@@ -611,6 +612,9 @@
const struct itimerspec __user *utmr);
asmlinkage long sys_eventfd(unsigned int count);
asmlinkage long sys_fallocate(int fd, int mode, loff_t offset, loff_t len);
+asmlinkage long sys_indirect(struct indirect_registers __user *userregs,
+void __user *userparams, size_t paramslen,
+int flags);
int kernel_execve(const char *filename, char *const argv[], char *const
envp[]);
--- linux/include/linux/sched.h
+++ linux/include/linux/sched.h
@@ -80,6 +80,7 @@ struct sched_param {
#include linux/rcupdate.h
#include linux/futex.h
#include linux/rtmutex.h
+#include linux/indirect.h
#include linux/time.h
#include linux/param.h
@@ -1174,6 +1175,9 @@ struct task_struct {
int make_it_fail;
#endif
struct prop_local_single dirties;
+
+ /* Additional system call parameters. */
+ union indirect_params indirect_params;
};
/*
-
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