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syscall.h: add syscall_set_arguments()

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This function is going to be needed on all HAVE_ARCH_TRACEHOOK
architectures to implement PTRACE_SET_SYSCALL_INFO API.

This partially reverts commit 7962c2eddb ("arch: remove unused function
syscall_set_arguments()") by reusing some of old syscall_set_arguments()
implementations.

[nathan@kernel.org: fix compile time fortify checks]
  Link: https://lkml.kernel.org/r/20250408213131.GA2872426@ax162
Link: https://lkml.kernel.org/r/20250303112009.GC24170@strace.io
Signed-off-by: Dmitry V. Levin <ldv@strace.io>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Charlie Jenkins <charlie@rivosinc.com>
Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
Acked-by: Helge Deller <deller@gmx.de> # parisc
Reviewed-by: Maciej W. Rozycki <macro@orcam.me.uk>	[mips]
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Alexey Gladkov (Intel) <legion@kernel.org>
Cc: Andreas Larsson <andreas@gaisler.com>
Cc: anton ivanov <anton.ivanov@cambridgegreys.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Betkov <bp@alien8.de>
Cc: Brian Cain <bcain@quicinc.com>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Christian Zankel <chris@zankel.net>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Davide Berardi <berardi.dav@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Dinh Nguyen <dinguyen@kernel.org>
Cc: Eugene Syromiatnikov <esyr@redhat.com>
Cc: Eugene Syromyatnikov <evgsyr@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Guo Ren <guoren@kernel.org>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Mike Frysinger <vapier@gentoo.org>
Cc: Naveen N Rao <naveen@kernel.org>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Renzo Davoi <renzo@cs.unibo.it>
Cc: Richard Weinberger <richard@nod.at>
Cc: Rich Felker <dalias@libc.org>
Cc: Russel King <linux@armlinux.org.uk>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Vineet Gupta <vgupta@kernel.org>
Cc: WANG Xuerui <kernel@xen0n.name>
Cc: Will Deacon <will@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Dmitry V. Levin 2025-03-03 13:20:09 +02:00 • committed by Andrew Morton
parent 87a929ae4f
commit 17fc7b8f9b
19 changed files with 256 additions and 0 deletions
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14
arch/arc/include/asm/syscall.h
View file

@ -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 = &regs->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)
{

13
arch/arm/include/asm/syscall.h
View file

@ -80,6 +80,19 @@ static inline void syscall_get_arguments(struct task_struct *task,
memcpy(args, &regs->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(&regs->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. */

13
arch/arm64/include/asm/syscall.h
View file

@ -73,6 +73,19 @@ static inline void syscall_get_arguments(struct task_struct *task,
memcpy(args, &regs->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(&regs->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.

13
arch/csky/include/asm/syscall.h
View file

@ -59,6 +59,19 @@ syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
memcpy(args, &regs->a1, 5 * sizeof(args[0]));
}
static inline void
syscall_set_arguments(struct task_struct *task, struct pt_regs *regs,
const unsigned long *args)
{
memcpy(&regs->a0, args, 6 * sizeof(regs->a0));
/*
* Also copy the first argument into orig_a0
* 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)
{

7
arch/hexagon/include/asm/syscall.h
View file

@ -33,6 +33,13 @@ static inline void syscall_get_arguments(struct task_struct *task,
memcpy(args, &(&regs->r00)[0], 6 * sizeof(args[0]));
}
static inline void syscall_set_arguments(struct task_struct *task,
struct pt_regs *regs,
unsigned long *args)
{
memcpy(&(&regs->r00)[0], args, 6 * sizeof(args[0]));
}
static inline long syscall_get_error(struct task_struct *task,
struct pt_regs *regs)
{

8
arch/loongarch/include/asm/syscall.h
View file

@ -61,6 +61,14 @@ static inline void syscall_get_arguments(struct task_struct *task,
memcpy(&args[1], &regs->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(&regs->regs[5], &args[1], 5 * sizeof(long));
}
static inline int syscall_get_arch(struct task_struct *task)
{
return AUDIT_ARCH_LOONGARCH64;

28
arch/mips/include/asm/syscall.h
View file

@ -74,6 +74,23 @@ 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->args[n] = *arg;
return;
}
#else
regs->regs[4 + n] = *arg;
#endif
}
static inline long syscall_get_error(struct task_struct *task,
struct pt_regs *regs)
{
@ -120,6 +137,17 @@ 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;
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[];

11
arch/nios2/include/asm/syscall.h
View file

@ -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;

7
arch/openrisc/include/asm/syscall.h
View file

@ -57,6 +57,13 @@ syscall_get_arguments(struct task_struct *task, struct pt_regs *regs,
memcpy(args, &regs->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(&regs->gpr[3], args, 6 * sizeof(args[0]));
}
static inline int syscall_get_arch(struct task_struct *task)
{
return AUDIT_ARCH_OPENRISC;

12
arch/parisc/include/asm/syscall.h
View file

@ -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)
{

10
arch/powerpc/include/asm/syscall.h
View file

@ -110,6 +110,16 @@ 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(&regs->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))

12
arch/riscv/include/asm/syscall.h
View file

@ -69,6 +69,18 @@ static inline void syscall_get_arguments(struct task_struct *task,
args[5] = regs->a5;
}
static inline void syscall_set_arguments(struct task_struct *task,
struct pt_regs *regs,
const unsigned long *args)
{
regs->orig_a0 = args[0];
regs->a1 = args[1];
regs->a2 = args[2];
regs->a3 = args[3];
regs->a4 = args[4];
regs->a5 = args[5];
}
static inline int syscall_get_arch(struct task_struct *task)
{
#ifdef CONFIG_64BIT

9
arch/s390/include/asm/syscall.h
View file

@ -76,6 +76,15 @@ 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)
{
regs->orig_gpr2 = args[0];
for (int n = 1; n < 6; n++)
regs->gprs[2 + n] = args[n];
}
static inline int syscall_get_arch(struct task_struct *task)
{
#ifdef CONFIG_COMPAT

12
arch/sh/include/asm/syscall_32.h
View file

@ -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;

10
arch/sparc/include/asm/syscall.h
View file

@ -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)

14
arch/um/include/asm/syscall-generic.h
View file

@ -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 = &regs->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 */

36
arch/x86/include/asm/syscall.h
View file

@ -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. */

11
arch/xtensa/include/asm/syscall.h
View file

@ -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,

16
include/asm-generic/syscall.h
View file

@ -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