@@ -67,6 +67,20 @@ syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
}
}
+static inline void
+syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
+ unsigned long *args)
+{
+ unsigned long *inside_ptregs = ®s->r0;
+ unsigned int n = 6;
+ unsigned int i = 0;
+
+ while (n--) {
+ *inside_ptregs = args[i++];
+ inside_ptregs--;
+ }
+}
+
static inline int
syscall_get_arch(struct task_struct *task)
{
@@ -80,6 +80,19 @@ static inline void syscall_get_arguments(struct task_struct *task,
memcpy(args, ®s->ARM_r0 + 1, 5 * sizeof(args[0]));
}
+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ const unsigned long *args)
+{
+ memcpy(®s->ARM_r0, args, 6 * sizeof(args[0]));
+ /*
+ * Also copy the first argument into ARM_ORIG_r0
+ * so that syscall_get_arguments() would return it
+ * instead of the previous value.
+ */
+ regs->ARM_ORIG_r0 = regs->ARM_r0;
+}
+
static inline int syscall_get_arch(struct task_struct *task)
{
/* ARM tasks don't change audit architectures on the fly. */
@@ -73,6 +73,19 @@ static inline void syscall_get_arguments(struct task_struct *task,
memcpy(args, ®s->regs[1], 5 * sizeof(args[0]));
}
+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ const unsigned long *args)
+{
+ memcpy(®s->regs[0], args, 6 * sizeof(args[0]));
+ /*
+ * Also copy the first argument into orig_x0
+ * so that syscall_get_arguments() would return it
+ * instead of the previous value.
+ */
+ regs->orig_x0 = regs->regs[0];
+}
+
/*
* We don't care about endianness (__AUDIT_ARCH_LE bit) here because
* AArch64 has the same system calls both on little- and big- endian.
@@ -59,6 +59,19 @@ syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
memcpy(args, ®s->a1, 5 * sizeof(args[0]));
}
+static inline void
+syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
+ const unsigned long *args)
+{
+ memcpy(®s->a0, args, 6 * sizeof(regs->a0));
+ /*
+ * Also copy the first argument into orig_x0
+ * so that syscall_get_arguments() would return it
+ * instead of the previous value.
+ */
+ regs->orig_a0 = regs->a0;
+}
+
static inline int
syscall_get_arch(struct task_struct *task)
{
@@ -33,6 +33,13 @@ static inline void syscall_get_arguments(struct task_struct *task,
memcpy(args, &(®s->r00)[0], 6 * sizeof(args[0]));
}
+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ unsigned long *args)
+{
+ memcpy(&(®s->r00)[0], args, 6 * sizeof(args[0]));
+}
+
static inline long syscall_get_error(struct task_struct *task,
struct pt_regs *regs)
{
@@ -45,6 +52,13 @@ static inline long syscall_get_return_value(struct task_struct *task,
return regs->r00;
}
+static inline void syscall_set_return_value(struct task_struct *task,
+ struct pt_regs *regs,
+ int error, long val)
+{
+ regs->r00 = (long) error ?: val;
+}
+
static inline int syscall_get_arch(struct task_struct *task)
{
return AUDIT_ARCH_HEXAGON;
@@ -61,6 +61,14 @@ static inline void syscall_get_arguments(struct task_struct *task,
memcpy(&args[1], ®s->regs[5], 5 * sizeof(long));
}
+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ unsigned long *args)
+{
+ regs->orig_a0 = args[0];
+ memcpy(®s->regs[5], &args[1], 5 * sizeof(long));
+}
+
static inline int syscall_get_arch(struct task_struct *task)
{
return AUDIT_ARCH_LOONGARCH64;
@@ -76,6 +76,23 @@ static inline void mips_get_syscall_arg(unsigned long *arg,
#endif
}
+static inline void mips_set_syscall_arg(unsigned long *arg,
+ struct task_struct *task, struct pt_regs *regs, unsigned int n)
+{
+#ifdef CONFIG_32BIT
+ switch (n) {
+ case 0: case 1: case 2: case 3:
+ regs->regs[4 + n] = *arg;
+ return;
+ case 4: case 5: case 6: case 7:
+ *arg = regs->pad0[n] = *arg;
+ return;
+ }
+#else
+ regs->regs[4 + n] = *arg;
+#endif
+}
+
static inline long syscall_get_error(struct task_struct *task,
struct pt_regs *regs)
{
@@ -122,6 +139,21 @@ static inline void syscall_get_arguments(struct task_struct *task,
mips_get_syscall_arg(args++, task, regs, i++);
}
+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ unsigned long *args)
+{
+ unsigned int i = 0;
+ unsigned int n = 6;
+
+ /* O32 ABI syscall() */
+ if (mips_syscall_is_indirect(task, regs))
+ i++;
+
+ while (n--)
+ mips_set_syscall_arg(args++, task, regs, i++);
+}
+
extern const unsigned long sys_call_table[];
extern const unsigned long sys32_call_table[];
extern const unsigned long sysn32_call_table[];
@@ -58,6 +58,17 @@ static inline void syscall_get_arguments(struct task_struct *task,
*args = regs->r9;
}
+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs, const unsigned long *args)
+{
+ regs->r4 = *args++;
+ regs->r5 = *args++;
+ regs->r6 = *args++;
+ regs->r7 = *args++;
+ regs->r8 = *args++;
+ regs->r9 = *args;
+}
+
static inline int syscall_get_arch(struct task_struct *task)
{
return AUDIT_ARCH_NIOS2;
@@ -57,6 +57,13 @@ syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
memcpy(args, ®s->gpr[3], 6 * sizeof(args[0]));
}
+static inline void
+syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
+ const unsigned long *args)
+{
+ memcpy(®s->gpr[3], args, 6 * sizeof(args[0]));
+}
+
static inline int syscall_get_arch(struct task_struct *task)
{
return AUDIT_ARCH_OPENRISC;
@@ -29,6 +29,18 @@ static inline void syscall_get_arguments(struct task_struct *tsk,
args[0] = regs->gr[26];
}
+static inline void syscall_set_arguments(struct task_struct *tsk,
+ struct pt_regs *regs,
+ unsigned long *args)
+{
+ regs->gr[21] = args[5];
+ regs->gr[22] = args[4];
+ regs->gr[23] = args[3];
+ regs->gr[24] = args[2];
+ regs->gr[25] = args[1];
+ regs->gr[26] = args[0];
+}
+
static inline long syscall_get_error(struct task_struct *task,
struct pt_regs *regs)
{
@@ -114,6 +114,16 @@ static inline void syscall_get_arguments(struct task_struct *task,
}
}
+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ const unsigned long *args)
+{
+ memcpy(®s->gpr[3], args, 6 * sizeof(args[0]));
+
+ /* Also copy the first argument into orig_gpr3 */
+ regs->orig_gpr3 = args[0];
+}
+
static inline int syscall_get_arch(struct task_struct *task)
{
if (is_tsk_32bit_task(task))
@@ -66,6 +66,15 @@ static inline void syscall_get_arguments(struct task_struct *task,
memcpy(args, ®s->a1, 5 * sizeof(args[0]));
}
+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ const unsigned long *args)
+{
+ regs->orig_a0 = args[0];
+ args++;
+ memcpy(®s->a1, args, 5 * sizeof(regs->a1));
+}
+
static inline int syscall_get_arch(struct task_struct *task)
{
#ifdef CONFIG_64BIT
@@ -78,6 +78,18 @@ static inline void syscall_get_arguments(struct task_struct *task,
args[0] = regs->orig_gpr2 & mask;
}
+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ const unsigned long *args)
+{
+ unsigned int n = 6;
+
+ while (n-- > 0)
+ if (n > 0)
+ regs->gprs[2 + n] = args[n];
+ regs->orig_gpr2 = args[0];
+}
+
static inline int syscall_get_arch(struct task_struct *task)
{
#ifdef CONFIG_COMPAT
@@ -57,6 +57,18 @@ static inline void syscall_get_arguments(struct task_struct *task,
args[0] = regs->regs[4];
}
+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ const unsigned long *args)
+{
+ regs->regs[1] = args[5];
+ regs->regs[0] = args[4];
+ regs->regs[7] = args[3];
+ regs->regs[6] = args[2];
+ regs->regs[5] = args[1];
+ regs->regs[4] = args[0];
+}
+
static inline int syscall_get_arch(struct task_struct *task)
{
int arch = AUDIT_ARCH_SH;
@@ -117,6 +117,16 @@ static inline void syscall_get_arguments(struct task_struct *task,
}
}
+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ const unsigned long *args)
+{
+ unsigned int i;
+
+ for (i = 0; i < 6; i++)
+ regs->u_regs[UREG_I0 + i] = args[i];
+}
+
static inline int syscall_get_arch(struct task_struct *task)
{
#if defined(CONFIG_SPARC64) && defined(CONFIG_COMPAT)
@@ -62,6 +62,20 @@ static inline void syscall_get_arguments(struct task_struct *task,
*args = UPT_SYSCALL_ARG6(r);
}
+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ const unsigned long *args)
+{
+ struct uml_pt_regs *r = ®s->regs;
+
+ UPT_SYSCALL_ARG1(r) = *args++;
+ UPT_SYSCALL_ARG2(r) = *args++;
+ UPT_SYSCALL_ARG3(r) = *args++;
+ UPT_SYSCALL_ARG4(r) = *args++;
+ UPT_SYSCALL_ARG5(r) = *args++;
+ UPT_SYSCALL_ARG6(r) = *args;
+}
+
/* See arch/x86/um/asm/syscall.h for syscall_get_arch() definition. */
#endif /* __UM_SYSCALL_GENERIC_H */
@@ -90,6 +90,18 @@ static inline void syscall_get_arguments(struct task_struct *task,
args[5] = regs->bp;
}
+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ const unsigned long *args)
+{
+ regs->bx = args[0];
+ regs->cx = args[1];
+ regs->dx = args[2];
+ regs->si = args[3];
+ regs->di = args[4];
+ regs->bp = args[5];
+}
+
static inline int syscall_get_arch(struct task_struct *task)
{
return AUDIT_ARCH_I386;
@@ -121,6 +133,30 @@ static inline void syscall_get_arguments(struct task_struct *task,
}
}
+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ const unsigned long *args)
+{
+# ifdef CONFIG_IA32_EMULATION
+ if (task->thread_info.status & TS_COMPAT) {
+ regs->bx = *args++;
+ regs->cx = *args++;
+ regs->dx = *args++;
+ regs->si = *args++;
+ regs->di = *args++;
+ regs->bp = *args;
+ } else
+# endif
+ {
+ regs->di = *args++;
+ regs->si = *args++;
+ regs->dx = *args++;
+ regs->r10 = *args++;
+ regs->r8 = *args++;
+ regs->r9 = *args;
+ }
+}
+
static inline int syscall_get_arch(struct task_struct *task)
{
/* x32 tasks should be considered AUDIT_ARCH_X86_64. */
@@ -68,6 +68,17 @@ static inline void syscall_get_arguments(struct task_struct *task,
args[i] = regs->areg[reg[i]];
}
+static inline void syscall_set_arguments(struct task_struct *task,
+ struct pt_regs *regs,
+ const unsigned long *args)
+{
+ static const unsigned int reg[] = XTENSA_SYSCALL_ARGUMENT_REGS;
+ unsigned int i;
+
+ for (i = 0; i < 6; ++i)
+ regs->areg[reg[i]] = args[i];
+}
+
asmlinkage long xtensa_rt_sigreturn(void);
asmlinkage long xtensa_shmat(int, char __user *, int);
asmlinkage long xtensa_fadvise64_64(int, int,
@@ -117,6 +117,22 @@ void syscall_set_return_value(struct task_struct *task, struct pt_regs *regs,
void syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
unsigned long *args);
+/**
+ * syscall_set_arguments - change system call parameter value
+ * @task: task of interest, must be in system call entry tracing
+ * @regs: task_pt_regs() of @task
+ * @args: array of argument values to store
+ *
+ * Changes 6 arguments to the system call.
+ * The first argument gets value @args[0], and so on.
+ *
+ * It's only valid to call this when @task is stopped for tracing on
+ * entry to a system call, due to %SYSCALL_WORK_SYSCALL_TRACE or
+ * %SYSCALL_WORK_SYSCALL_AUDIT.
+ */
+void syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
+ const unsigned long *args);
+
/**
* syscall_get_arch - return the AUDIT_ARCH for the current system call
* @task: task of interest, must be blocked
These functions are going to be needed on all HAVE_ARCH_TRACEHOOK architectures to implement PTRACE_SET_SYSCALL_INFO API. This partially reverts commit 7962c2eddbfe ("arch: remove unused function syscall_set_arguments()") by reusing some of old syscall_set_arguments() implementations. Signed-off-by: Dmitry V. Levin <ldv@strace.io> --- Note that I'm not a MIPS expert, I just added mips_set_syscall_arg() by looking at mips_get_syscall_arg() and the result passes tests in qemu on mips O32, mips64 O32, mips64 N32, and mips64 N64. arch/arc/include/asm/syscall.h | 14 +++++++++++ arch/arm/include/asm/syscall.h | 13 ++++++++++ arch/arm64/include/asm/syscall.h | 13 ++++++++++ arch/csky/include/asm/syscall.h | 13 ++++++++++ arch/hexagon/include/asm/syscall.h | 14 +++++++++++ arch/loongarch/include/asm/syscall.h | 8 ++++++ arch/mips/include/asm/syscall.h | 32 ++++++++++++++++++++++++ arch/nios2/include/asm/syscall.h | 11 ++++++++ arch/openrisc/include/asm/syscall.h | 7 ++++++ arch/parisc/include/asm/syscall.h | 12 +++++++++ arch/powerpc/include/asm/syscall.h | 10 ++++++++ arch/riscv/include/asm/syscall.h | 9 +++++++ arch/s390/include/asm/syscall.h | 12 +++++++++ arch/sh/include/asm/syscall_32.h | 12 +++++++++ arch/sparc/include/asm/syscall.h | 10 ++++++++ arch/um/include/asm/syscall-generic.h | 14 +++++++++++ arch/x86/include/asm/syscall.h | 36 +++++++++++++++++++++++++++ arch/xtensa/include/asm/syscall.h | 11 ++++++++ include/asm-generic/syscall.h | 16 ++++++++++++ 19 files changed, 267 insertions(+)