forked from luck/tmp_suning_uos_patched
syscalls/core: Prepare CONFIG_ARCH_HAS_SYSCALL_WRAPPER=y for compat syscalls
It may be useful for an architecture to override the definitions of the COMPAT_SYSCALL_DEFINE0() and __COMPAT_SYSCALL_DEFINEx() macros in <linux/compat.h>, in particular to use a different calling convention for syscalls. This patch provides a mechanism to do so, based on the previously introduced CONFIG_ARCH_HAS_SYSCALL_WRAPPER. If it is enabled, <asm/sycall_wrapper.h> is included in <linux/compat.h> and may be used to define the macros mentioned above. Moreover, as the syscall calling convention may be different if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is set, the compat syscall function prototypes in <linux/compat.h> are #ifndef'd out in that case. As some of the syscalls and/or compat syscalls may not be present, the COND_SYSCALL() and COND_SYSCALL_COMPAT() macros in kernel/sys_ni.c as well as the SYS_NI() and COMPAT_SYS_NI() macros in kernel/time/posix-stubs.c can be re-defined in <asm/syscall_wrapper.h> iff CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled. Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20180405095307.3730-5-linux@dominikbrodowski.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Dominik Brodowski
Ingo Molnar
parent
fa697140f9
commit
7303e30ec1
|
|
@ -24,6 +24,17 @@
|
|||
#include <asm/siginfo.h>
|
||||
#include <asm/signal.h>
|
||||
|
||||
#ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
|
||||
/*
|
||||
* It may be useful for an architecture to override the definitions of the
|
||||
* COMPAT_SYSCALL_DEFINE0 and COMPAT_SYSCALL_DEFINEx() macros, in particular
|
||||
* to use a different calling convention for syscalls. To allow for that,
|
||||
+ the prototypes for the compat_sys_*() functions below will *not* be included
|
||||
* if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
|
||||
*/
|
||||
#include <asm/syscall_wrapper.h>
|
||||
#endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
|
||||
|
||||
#ifndef COMPAT_USE_64BIT_TIME
|
||||
#define COMPAT_USE_64BIT_TIME 0
|
||||
#endif
|
||||
|
|
@ -32,10 +43,12 @@
|
|||
#define __SC_DELOUSE(t,v) ((__force t)(unsigned long)(v))
|
||||
#endif
|
||||
|
||||
#ifndef COMPAT_SYSCALL_DEFINE0
|
||||
#define COMPAT_SYSCALL_DEFINE0(name) \
|
||||
asmlinkage long compat_sys_##name(void); \
|
||||
ALLOW_ERROR_INJECTION(compat_sys_##name, ERRNO); \
|
||||
asmlinkage long compat_sys_##name(void)
|
||||
#endif /* COMPAT_SYSCALL_DEFINE0 */
|
||||
|
||||
#define COMPAT_SYSCALL_DEFINE1(name, ...) \
|
||||
COMPAT_SYSCALL_DEFINEx(1, _##name, __VA_ARGS__)
|
||||
|
|
@ -50,6 +63,7 @@
|
|||
#define COMPAT_SYSCALL_DEFINE6(name, ...) \
|
||||
COMPAT_SYSCALL_DEFINEx(6, _##name, __VA_ARGS__)
|
||||
|
||||
#ifndef COMPAT_SYSCALL_DEFINEx
|
||||
#define COMPAT_SYSCALL_DEFINEx(x, name, ...) \
|
||||
asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
|
||||
asmlinkage long compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__))\
|
||||
|
|
@ -62,6 +76,7 @@
|
|||
return C_SYSC##name(__MAP(x,__SC_DELOUSE,__VA_ARGS__)); \
|
||||
} \
|
||||
static inline long C_SYSC##name(__MAP(x,__SC_DECL,__VA_ARGS__))
|
||||
#endif /* COMPAT_SYSCALL_DEFINEx */
|
||||
|
||||
#ifndef compat_user_stack_pointer
|
||||
#define compat_user_stack_pointer() current_user_stack_pointer()
|
||||
|
|
@ -517,7 +532,12 @@ int __compat_save_altstack(compat_stack_t __user *, unsigned long);
|
|||
* Please note that these prototypes here are only provided for information
|
||||
* purposes, for static analysis, and for linking from the syscall table.
|
||||
* These functions should not be called elsewhere from kernel code.
|
||||
*
|
||||
* As the syscall calling convention may be different from the default
|
||||
* for architectures overriding the syscall calling convention, do not
|
||||
* include the prototypes if CONFIG_ARCH_HAS_SYSCALL_WRAPPER is enabled.
|
||||
*/
|
||||
#ifndef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
|
||||
asmlinkage long compat_sys_io_setup(unsigned nr_reqs, u32 __user *ctx32p);
|
||||
asmlinkage long compat_sys_io_submit(compat_aio_context_t ctx_id, int nr,
|
||||
u32 __user *iocb);
|
||||
|
|
@ -955,6 +975,8 @@ asmlinkage long compat_sys_stime(compat_time_t __user *tptr);
|
|||
/* obsolete: net/socket.c */
|
||||
asmlinkage long compat_sys_socketcall(int call, u32 __user *args);
|
||||
|
||||
#endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
|
||||
|
||||
|
||||
/*
|
||||
* For most but not all architectures, "am I in a compat syscall?" and
|
||||
|
|
|
|||
|
|
@ -1925,8 +1925,11 @@ config ARCH_HAS_SYNC_CORE_BEFORE_USERMODE
|
|||
bool
|
||||
|
||||
# It may be useful for an architecture to override the definitions of the
|
||||
# SYSCALL_DEFINE() and __SYSCALL_DEFINEx() macros in <linux/syscalls.h>,
|
||||
# in particular to use a different calling convention for syscalls.
|
||||
# SYSCALL_DEFINE() and __SYSCALL_DEFINEx() macros in <linux/syscalls.h>
|
||||
# and the COMPAT_ variants in <linux/compat.h>, in particular to use a
|
||||
# different calling convention for syscalls. They can also override the
|
||||
# macros for not-implemented syscalls in kernel/sys_ni.c and
|
||||
# kernel/time/posix-stubs.c. All these overrides need to be available in
|
||||
# <asm/syscall_wrapper.h>.
|
||||
config ARCH_HAS_SYSCALL_WRAPPER
|
||||
def_bool n
|
||||
depends on !COMPAT
|
||||
|
|
|
|||
|
|
@ -5,6 +5,11 @@
|
|||
|
||||
#include <asm/unistd.h>
|
||||
|
||||
#ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
|
||||
/* Architectures may override COND_SYSCALL and COND_SYSCALL_COMPAT */
|
||||
#include <asm/syscall_wrapper.h>
|
||||
#endif /* CONFIG_ARCH_HAS_SYSCALL_WRAPPER */
|
||||
|
||||
/* we can't #include <linux/syscalls.h> here,
|
||||
but tell gcc to not warn with -Wmissing-prototypes */
|
||||
asmlinkage long sys_ni_syscall(void);
|
||||
|
|
@ -17,8 +22,13 @@ asmlinkage long sys_ni_syscall(void)
|
|||
return -ENOSYS;
|
||||
}
|
||||
|
||||
#ifndef COND_SYSCALL
|
||||
#define COND_SYSCALL(name) cond_syscall(sys_##name)
|
||||
#endif /* COND_SYSCALL */
|
||||
|
||||
#ifndef COND_SYSCALL_COMPAT
|
||||
#define COND_SYSCALL_COMPAT(name) cond_syscall(compat_sys_##name)
|
||||
#endif /* COND_SYSCALL_COMPAT */
|
||||
|
||||
/*
|
||||
* This list is kept in the same order as include/uapi/asm-generic/unistd.h.
|
||||
|
|
|
|||
|
|
@ -19,6 +19,11 @@
|
|||
#include <linux/posix-timers.h>
|
||||
#include <linux/compat.h>
|
||||
|
||||
#ifdef CONFIG_ARCH_HAS_SYSCALL_WRAPPER
|
||||
/* Architectures may override SYS_NI and COMPAT_SYS_NI */
|
||||
#include <asm/syscall_wrapper.h>
|
||||
#endif
|
||||
|
||||
asmlinkage long sys_ni_posix_timers(void)
|
||||
{
|
||||
pr_err_once("process %d (%s) attempted a POSIX timer syscall "
|
||||
|
|
@ -27,8 +32,13 @@ asmlinkage long sys_ni_posix_timers(void)
|
|||
return -ENOSYS;
|
||||
}
|
||||
|
||||
#ifndef SYS_NI
|
||||
#define SYS_NI(name) SYSCALL_ALIAS(sys_##name, sys_ni_posix_timers)
|
||||
#endif
|
||||
|
||||
#ifndef COMPAT_SYS_NI
|
||||
#define COMPAT_SYS_NI(name) SYSCALL_ALIAS(compat_sys_##name, sys_ni_posix_timers)
|
||||
#endif
|
||||
|
||||
SYS_NI(timer_create);
|
||||
SYS_NI(timer_gettime);
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user