From ea08eeccae9297f7aabd2ef7f0c2517ac4549acc Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:18:26 +0000
Subject: [PATCH] write in 30M
---
kernel/arch/parisc/kernel/ptrace.c | 143 ++++++++++++++++++++++-------------------------
1 files changed, 68 insertions(+), 75 deletions(-)
diff --git a/kernel/arch/parisc/kernel/ptrace.c b/kernel/arch/parisc/kernel/ptrace.c
index de2998c..df9b9f0 100644
--- a/kernel/arch/parisc/kernel/ptrace.c
+++ b/kernel/arch/parisc/kernel/ptrace.c
@@ -26,7 +26,6 @@
#include <linux/audit.h>
#include <linux/uaccess.h>
-#include <asm/pgtable.h>
#include <asm/processor.h>
#include <asm/asm-offsets.h>
@@ -88,9 +87,9 @@
ptrace_disable(task);
/* Don't wake up the task, but let the
parent know something happened. */
- force_sig_fault(SIGTRAP, TRAP_TRACE,
- (void __user *) (task_regs(task)->iaoq[0] & ~3),
- task);
+ force_sig_fault_to_task(SIGTRAP, TRAP_TRACE,
+ (void __user *) (task_regs(task)->iaoq[0] & ~3),
+ task);
/* notify_parent(task, SIGCHLD); */
return;
}
@@ -127,6 +126,12 @@
unsigned long __user *datap = (unsigned long __user *)data;
unsigned long tmp;
long ret = -EIO;
+
+ unsigned long user_regs_struct_size = sizeof(struct user_regs_struct);
+#ifdef CONFIG_64BIT
+ if (is_compat_task())
+ user_regs_struct_size /= 2;
+#endif
switch (request) {
@@ -183,14 +188,14 @@
return copy_regset_to_user(child,
task_user_regset_view(current),
REGSET_GENERAL,
- 0, sizeof(struct user_regs_struct),
+ 0, user_regs_struct_size,
datap);
case PTRACE_SETREGS: /* Set all gp regs in the child. */
return copy_regset_from_user(child,
task_user_regset_view(current),
REGSET_GENERAL,
- 0, sizeof(struct user_regs_struct),
+ 0, user_regs_struct_size,
datap);
case PTRACE_GETFPREGS: /* Get the child FPU state. */
@@ -304,6 +309,11 @@
}
}
break;
+ case PTRACE_GETREGS:
+ case PTRACE_SETREGS:
+ case PTRACE_GETFPREGS:
+ case PTRACE_SETFPREGS:
+ return arch_ptrace(child, request, addr, data);
default:
ret = compat_ptrace_request(child, request, addr, data);
@@ -342,7 +352,7 @@
}
/* Do the secure computing check after ptrace. */
- if (secure_computing(NULL) == -1)
+ if (secure_computing() == -1)
return -1;
#ifdef CONFIG_HAVE_SYSCALL_TRACEPOINTS
@@ -392,31 +402,11 @@
static int fpr_get(struct task_struct *target,
const struct user_regset *regset,
- unsigned int pos, unsigned int count,
- void *kbuf, void __user *ubuf)
+ struct membuf to)
{
struct pt_regs *regs = task_regs(target);
- __u64 *k = kbuf;
- __u64 __user *u = ubuf;
- __u64 reg;
- pos /= sizeof(reg);
- count /= sizeof(reg);
-
- if (kbuf)
- for (; count > 0 && pos < ELF_NFPREG; --count)
- *k++ = regs->fr[pos++];
- else
- for (; count > 0 && pos < ELF_NFPREG; --count)
- if (__put_user(regs->fr[pos++], u++))
- return -EFAULT;
-
- kbuf = k;
- ubuf = u;
- pos *= sizeof(reg);
- count *= sizeof(reg);
- return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
- ELF_NFPREG * sizeof(reg), -1);
+ return membuf_write(&to, regs->fr, ELF_NFPREG * sizeof(__u64));
}
static int fpr_set(struct task_struct *target,
@@ -528,30 +518,14 @@
static int gpr_get(struct task_struct *target,
const struct user_regset *regset,
- unsigned int pos, unsigned int count,
- void *kbuf, void __user *ubuf)
+ struct membuf to)
{
struct pt_regs *regs = task_regs(target);
- unsigned long *k = kbuf;
- unsigned long __user *u = ubuf;
- unsigned long reg;
+ unsigned int pos;
- pos /= sizeof(reg);
- count /= sizeof(reg);
-
- if (kbuf)
- for (; count > 0 && pos < ELF_NGREG; --count)
- *k++ = get_reg(regs, pos++);
- else
- for (; count > 0 && pos < ELF_NGREG; --count)
- if (__put_user(get_reg(regs, pos++), u++))
- return -EFAULT;
- kbuf = k;
- ubuf = u;
- pos *= sizeof(reg);
- count *= sizeof(reg);
- return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
- ELF_NGREG * sizeof(reg), -1);
+ for (pos = 0; pos < ELF_NGREG; pos++)
+ membuf_store(&to, get_reg(regs, pos));
+ return 0;
}
static int gpr_set(struct task_struct *target,
@@ -589,12 +563,12 @@
[REGSET_GENERAL] = {
.core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
.size = sizeof(long), .align = sizeof(long),
- .get = gpr_get, .set = gpr_set
+ .regset_get = gpr_get, .set = gpr_set
},
[REGSET_FP] = {
.core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
.size = sizeof(__u64), .align = sizeof(__u64),
- .get = fpr_get, .set = fpr_set
+ .regset_get = fpr_get, .set = fpr_set
}
};
@@ -608,31 +582,15 @@
static int gpr32_get(struct task_struct *target,
const struct user_regset *regset,
- unsigned int pos, unsigned int count,
- void *kbuf, void __user *ubuf)
+ struct membuf to)
{
struct pt_regs *regs = task_regs(target);
- compat_ulong_t *k = kbuf;
- compat_ulong_t __user *u = ubuf;
- compat_ulong_t reg;
+ unsigned int pos;
- pos /= sizeof(reg);
- count /= sizeof(reg);
+ for (pos = 0; pos < ELF_NGREG; pos++)
+ membuf_store(&to, (compat_ulong_t)get_reg(regs, pos));
- if (kbuf)
- for (; count > 0 && pos < ELF_NGREG; --count)
- *k++ = get_reg(regs, pos++);
- else
- for (; count > 0 && pos < ELF_NGREG; --count)
- if (__put_user((compat_ulong_t) get_reg(regs, pos++), u++))
- return -EFAULT;
-
- kbuf = k;
- ubuf = u;
- pos *= sizeof(reg);
- count *= sizeof(reg);
- return user_regset_copyout_zero(&pos, &count, &kbuf, &ubuf,
- ELF_NGREG * sizeof(reg), -1);
+ return 0;
}
static int gpr32_set(struct task_struct *target,
@@ -673,12 +631,12 @@
[REGSET_GENERAL] = {
.core_note_type = NT_PRSTATUS, .n = ELF_NGREG,
.size = sizeof(compat_long_t), .align = sizeof(compat_long_t),
- .get = gpr32_get, .set = gpr32_set
+ .regset_get = gpr32_get, .set = gpr32_set
},
[REGSET_FP] = {
.core_note_type = NT_PRFPREG, .n = ELF_NFPREG,
.size = sizeof(__u64), .align = sizeof(__u64),
- .get = fpr_get, .set = fpr_set
+ .regset_get = fpr_get, .set = fpr_set
}
};
@@ -798,3 +756,38 @@
return roff->name;
return NULL;
}
+
+/**
+ * regs_within_kernel_stack() - check the address in the stack
+ * @regs: pt_regs which contains kernel stack pointer.
+ * @addr: address which is checked.
+ *
+ * regs_within_kernel_stack() checks @addr is within the kernel stack page(s).
+ * If @addr is within the kernel stack, it returns true. If not, returns false.
+ */
+int regs_within_kernel_stack(struct pt_regs *regs, unsigned long addr)
+{
+ return ((addr & ~(THREAD_SIZE - 1)) ==
+ (kernel_stack_pointer(regs) & ~(THREAD_SIZE - 1)));
+}
+
+/**
+ * regs_get_kernel_stack_nth() - get Nth entry of the stack
+ * @regs: pt_regs which contains kernel stack pointer.
+ * @n: stack entry number.
+ *
+ * regs_get_kernel_stack_nth() returns @n th entry of the kernel stack which
+ * is specified by @regs. If the @n th entry is NOT in the kernel stack,
+ * this returns 0.
+ */
+unsigned long regs_get_kernel_stack_nth(struct pt_regs *regs, unsigned int n)
+{
+ unsigned long *addr = (unsigned long *)kernel_stack_pointer(regs);
+
+ addr -= n;
+
+ if (!regs_within_kernel_stack(regs, (unsigned long)addr))
+ return 0;
+
+ return *addr;
+}
--
Gitblit v1.6.2