[PATCH v4 2/6] x86/arch_prctl/64 Rename do_arch_prctl to do_arch_prctl_64
STALE3667d
From: Kyle Huey <hidden>
Date: 2016-09-19 04:19:52
Also in:
linux-um, lkml
Subsystem:
ptrace support, the rest, user-mode linux (uml), x86 architecture (32-bit and 64-bit) · Maintainers:
Oleg Nesterov, Linus Torvalds, Richard Weinberger, Anton Ivanov, Johannes Berg, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
Revision v4 of 13 in this series.
Revisions (13)
In order to introduce new arch_prctls that are not 64 bit only, rename the existing 64 bit implementation to do_arch_prctl_64. Also rename the second argument to arch_prctl, which will no longer always be an address. Signed-off-by: Kyle Huey <khuey-OhBmq/TcCDJWk0Htik3J/w@public.gmane.org> --- arch/x86/include/asm/proto.h | 4 +++- arch/x86/kernel/process_64.c | 26 ++++++++++++++------------ arch/x86/kernel/ptrace.c | 8 ++++---- arch/x86/um/syscalls_64.c | 4 ++-- 4 files changed, 23 insertions(+), 19 deletions(-)
diff --git a/arch/x86/include/asm/proto.h b/arch/x86/include/asm/proto.h
index 9b9b30b..95c3e51 100644
--- a/arch/x86/include/asm/proto.h
+++ b/arch/x86/include/asm/proto.h@@ -30,6 +30,8 @@ void x86_report_nx(void); extern int reboot_force; -long do_arch_prctl(struct task_struct *task, int code, unsigned long addr); +#ifdef CONFIG_X86_64 +long do_arch_prctl_64(struct task_struct *task, int code, unsigned long arg2); +#endif #endif /* _ASM_X86_PROTO_H */
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 4d6363c..292ce48 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c@@ -197,7 +197,7 @@ int copy_thread_tls(unsigned long clone_flags, unsigned long sp, (struct user_desc __user *)tls, 0); else #endif - err = do_arch_prctl(p, ARCH_SET_FS, tls); + err = do_arch_prctl_64(p, ARCH_SET_FS, tls); if (err) goto out; }
@@ -525,7 +525,7 @@ void set_personality_ia32(bool x32) } EXPORT_SYMBOL_GPL(set_personality_ia32); -long do_arch_prctl(struct task_struct *task, int code, unsigned long addr) +long do_arch_prctl_64(struct task_struct *task, int code, unsigned long arg2) { int ret = 0; int doit = task == current;
@@ -533,48 +533,50 @@ long do_arch_prctl(struct task_struct *task, int code, unsigned long addr) switch (code) { case ARCH_SET_GS: - if (addr >= TASK_SIZE_MAX) + if (arg2 >= TASK_SIZE_MAX) return -EPERM; cpu = get_cpu(); task->thread.gsindex = 0; - task->thread.gsbase = addr; + task->thread.gsbase = arg2; if (doit) { load_gs_index(0); - ret = wrmsrl_safe(MSR_KERNEL_GS_BASE, addr); + ret = wrmsrl_safe(MSR_KERNEL_GS_BASE, arg2); } put_cpu(); break; case ARCH_SET_FS: /* Not strictly needed for fs, but do it for symmetry with gs */ - if (addr >= TASK_SIZE_MAX) + if (arg2 >= TASK_SIZE_MAX) return -EPERM; cpu = get_cpu(); task->thread.fsindex = 0; - task->thread.fsbase = addr; + task->thread.fsbase = arg2; if (doit) { /* set the selector to 0 to not confuse __switch_to */ loadsegment(fs, 0); - ret = wrmsrl_safe(MSR_FS_BASE, addr); + ret = wrmsrl_safe(MSR_FS_BASE, arg2); } put_cpu(); break; case ARCH_GET_FS: { unsigned long base; + if (doit) rdmsrl(MSR_FS_BASE, base); else base = task->thread.fsbase; - ret = put_user(base, (unsigned long __user *)addr); + ret = put_user(base, (unsigned long __user *)arg2); break; } case ARCH_GET_GS: { unsigned long base; + if (doit) rdmsrl(MSR_KERNEL_GS_BASE, base); else base = task->thread.gsbase; - ret = put_user(base, (unsigned long __user *)addr); + ret = put_user(base, (unsigned long __user *)arg2); break; }
@@ -586,9 +588,9 @@ long do_arch_prctl(struct task_struct *task, int code, unsigned long addr) return ret; } -SYSCALL_DEFINE2(arch_prctl, int, code, unsigned long, addr) +SYSCALL_DEFINE2(arch_prctl, int, code, unsigned long, arg2) { - return do_arch_prctl(current, code, addr); + return do_arch_prctl_64(current, code, arg2); } unsigned long KSTK_ESP(struct task_struct *task)
diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index f79576a..030cbc5 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c@@ -395,12 +395,12 @@ static int putreg(struct task_struct *child, if (value >= TASK_SIZE_MAX) return -EIO; /* - * When changing the segment base, use do_arch_prctl + * When changing the segment base, use do_arch_prctl_64 * to set either thread.fs or thread.fsindex and the * corresponding GDT slot. */ if (child->thread.fsbase != value) - return do_arch_prctl(child, ARCH_SET_FS, value); + return do_arch_prctl_64(child, ARCH_SET_FS, value); return 0; case offsetof(struct user_regs_struct,gs_base): /*
@@ -409,7 +409,7 @@ static int putreg(struct task_struct *child, if (value >= TASK_SIZE_MAX) return -EIO; if (child->thread.gsbase != value) - return do_arch_prctl(child, ARCH_SET_GS, value); + return do_arch_prctl_64(child, ARCH_SET_GS, value); return 0; #endif }
@@ -868,7 +868,7 @@ long arch_ptrace(struct task_struct *child, long request, Works just like arch_prctl, except that the arguments are reversed. */ case PTRACE_ARCH_PRCTL: - ret = do_arch_prctl(child, data, addr); + ret = do_arch_prctl_64(child, data, addr); break; #endif
diff --git a/arch/x86/um/syscalls_64.c b/arch/x86/um/syscalls_64.c
index 3282066..acd0922 100644
--- a/arch/x86/um/syscalls_64.c
+++ b/arch/x86/um/syscalls_64.c@@ -72,9 +72,9 @@ long arch_prctl(struct task_struct *task, int code, unsigned long __user *addr) return ret; } -SYSCALL_DEFINE2(arch_prctl, int, code, unsigned long, addr) +SYSCALL_DEFINE2(arch_prctl, int, code, unsigned long, arg2) { - return arch_prctl(current, code, (unsigned long __user *) addr); + return arch_prctl(current, code, (unsigned long __user *) arg2); } void arch_switch_to(struct task_struct *to)
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2.9.3