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s390: enable HAVE_FUNCTION_ERROR_INJECTION 

This kernel feature is required for enabling BPF_KPROBE_OVERRIDE.

Define override_function_with_return() and regs_set_return_value()
functions, and fix compile errors in syscall_wrapper.h.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Ilya Leoshkevich 2020-07-22 23:58:54 +02:00 committed by Heiko Carstens
parent 4631f3ca49
commit 73d6eb48d2
5 changed files with 25 additions and 3 deletions
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1
arch/s390/Kconfig
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@ -145,6 +145,7 @@ config S390
select HAVE_EFFICIENT_UNALIGNED_ACCESS
select HAVE_FENTRY
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_FUNCTION_ERROR_INJECTION
select HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FUNCTION_TRACER
select HAVE_FUTEX_CMPXCHG if FUTEX

5
arch/s390/include/asm/ptrace.h
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@ -184,5 +184,10 @@ static inline unsigned long kernel_stack_pointer(struct pt_regs *regs)
return regs->gprs[15];
}
static inline void regs_set_return_value(struct pt_regs *regs, unsigned long rc)
{
regs->gprs[2] = rc;
}
#endif /* __ASSEMBLY__ */
#endif /* _S390_PTRACE_H */

6
arch/s390/include/asm/syscall_wrapper.h
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@ -30,7 +30,7 @@
})
#define __S390_SYS_STUBx(x, name, ...) \
asmlinkage long __s390_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))\
asmlinkage long __s390_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__));\
ALLOW_ERROR_INJECTION(__s390_sys##name, ERRNO); \
asmlinkage long __s390_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__))\
{ \
@ -46,7 +46,7 @@
#define COMPAT_SYSCALL_DEFINE0(sname) \
SYSCALL_METADATA(_##sname, 0); \
asmlinkage long __s390_compat_sys_##sname(void); \
ALLOW_ERROR_INJECTION(__s390_compat__sys_##sname, ERRNO); \
ALLOW_ERROR_INJECTION(__s390_compat_sys_##sname, ERRNO); \
asmlinkage long __s390_compat_sys_##sname(void)
#define SYSCALL_DEFINE0(sname) \
@ -72,7 +72,7 @@
asmlinkage long __s390_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)); \
asmlinkage long __s390_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__)) \
__attribute__((alias(__stringify(__se_compat_sys##name)))); \
ALLOW_ERROR_INJECTION(compat_sys##name, ERRNO); \
ALLOW_ERROR_INJECTION(__s390_compat_sys##name, ERRNO); \
static inline long __do_compat_sys##name(__MAP(x,__SC_DECL,__VA_ARGS__));\
asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)); \
asmlinkage long __se_compat_sys##name(__MAP(x,__SC_LONG,__VA_ARGS__)) \

2
arch/s390/lib/Makefile
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@ -14,3 +14,5 @@ KASAN_SANITIZE_uaccess.o := n
obj-$(CONFIG_S390_UNWIND_SELFTEST) += test_unwind.o
CFLAGS_test_unwind.o += -fno-optimize-sibling-calls
lib-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o

14
arch/s390/lib/error-inject.c Normal file
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@ -0,0 +1,14 @@
// SPDX-License-Identifier: GPL-2.0+
#include <asm/ptrace.h>
#include <linux/error-injection.h>
#include <linux/kprobes.h>
void override_function_with_return(struct pt_regs *regs)
{
/*
* Emulate 'br 14'. 'regs' is captured by kprobes on entry to some
* kernel function.
*/
regs->psw.addr = regs->gprs[14];
}
NOKPROBE_SYMBOL(override_function_with_return);