diff options
Diffstat (limited to 'arch/x86')
-rw-r--r-- | arch/x86/um/Makefile | 2 | ||||
-rw-r--r-- | arch/x86/um/ldt.c | 41 | ||||
-rw-r--r-- | arch/x86/um/shared/sysdep/stub.h | 1 | ||||
-rw-r--r-- | arch/x86/um/stub_32.S | 56 | ||||
-rw-r--r-- | arch/x86/um/stub_64.S | 50 |
5 files changed, 16 insertions, 134 deletions
diff --git a/arch/x86/um/Makefile b/arch/x86/um/Makefile index 8bc72a51b257..4559d2a693c4 100644 --- a/arch/x86/um/Makefile +++ b/arch/x86/um/Makefile @@ -11,7 +11,7 @@ endif obj-y = bugs_$(BITS).o delay.o fault.o ldt.o \ ptrace_$(BITS).o ptrace_user.o setjmp_$(BITS).o signal.o \ - stub_$(BITS).o stub_segv.o \ + stub_segv.o \ sys_call_table_$(BITS).o sysrq_$(BITS).o tls_$(BITS).o \ mem_$(BITS).o subarch.o os-Linux/ diff --git a/arch/x86/um/ldt.c b/arch/x86/um/ldt.c index 255a44dd415a..c99fc23b1290 100644 --- a/arch/x86/um/ldt.c +++ b/arch/x86/um/ldt.c @@ -12,33 +12,22 @@ #include <os.h> #include <skas.h> #include <sysdep/tls.h> +#include <stub-data.h> static inline int modify_ldt (int func, void *ptr, unsigned long bytecount) { return syscall(__NR_modify_ldt, func, ptr, bytecount); } -static long write_ldt_entry(struct mm_id *mm_idp, int func, - struct user_desc *desc, void **addr, int done) +static void write_ldt_entry(struct mm_id *mm_idp, int func, + struct user_desc *desc) { - long res; - void *stub_addr; - - BUILD_BUG_ON(sizeof(*desc) % sizeof(long)); - - res = syscall_stub_data(mm_idp, (unsigned long *)desc, - sizeof(*desc) / sizeof(long), - addr, &stub_addr); - if (!res) { - unsigned long args[] = { func, - (unsigned long)stub_addr, - sizeof(*desc), - 0, 0, 0 }; - res = run_syscall_stub(mm_idp, __NR_modify_ldt, args, - 0, addr, done); - } + struct stub_syscall *sc; - return res; + sc = syscall_stub_alloc(mm_idp); + sc->syscall = STUB_SYSCALL_LDT; + sc->ldt.func = func; + memcpy(&sc->ldt.desc, desc, sizeof(*desc)); } /* @@ -127,7 +116,6 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int func) int i, err; struct user_desc ldt_info; struct ldt_entry entry0, *ldt_p; - void *addr = NULL; err = -EINVAL; if (bytecount != sizeof(ldt_info)) @@ -148,7 +136,8 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int func) mutex_lock(&ldt->lock); - err = write_ldt_entry(mm_idp, func, &ldt_info, &addr, 1); + write_ldt_entry(mm_idp, func, &ldt_info); + err = syscall_stub_flush(mm_idp); if (err) goto out_unlock; @@ -166,7 +155,8 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int func) err = -ENOMEM; /* Undo the change in host */ memset(&ldt_info, 0, sizeof(ldt_info)); - write_ldt_entry(mm_idp, 1, &ldt_info, &addr, 1); + write_ldt_entry(mm_idp, 1, &ldt_info); + err = syscall_stub_flush(mm_idp); goto out_unlock; } if (i == 0) { @@ -303,7 +293,6 @@ long init_new_ldt(struct mm_context *new_mm, struct mm_context *from_mm) short * num_p; int i; long page, err=0; - void *addr = NULL; mutex_init(&new_mm->arch.ldt.lock); @@ -318,11 +307,9 @@ long init_new_ldt(struct mm_context *new_mm, struct mm_context *from_mm) ldt_get_host_info(); for (num_p=host_ldt_entries; *num_p != -1; num_p++) { desc.entry_number = *num_p; - err = write_ldt_entry(&new_mm->id, 1, &desc, - &addr, *(num_p + 1) == -1); - if (err) - break; + write_ldt_entry(&new_mm->id, 1, &desc); } + err = syscall_stub_flush(&new_mm->id); new_mm->arch.ldt.entry_count = 0; goto out; diff --git a/arch/x86/um/shared/sysdep/stub.h b/arch/x86/um/shared/sysdep/stub.h index ce0ca46ad383..579681d12158 100644 --- a/arch/x86/um/shared/sysdep/stub.h +++ b/arch/x86/um/shared/sysdep/stub.h @@ -12,4 +12,5 @@ #endif extern void stub_segv_handler(int, siginfo_t *, void *); +extern void stub_syscall_handler(void); extern void stub_clone_handler(void); diff --git a/arch/x86/um/stub_32.S b/arch/x86/um/stub_32.S deleted file mode 100644 index 8291899e6aaf..000000000000 --- a/arch/x86/um/stub_32.S +++ /dev/null @@ -1,56 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -#include <as-layout.h> - -.section .__syscall_stub, "ax" - - .globl batch_syscall_stub -batch_syscall_stub: - /* %esp comes in as "top of page" */ - mov %esp, %ecx - /* %esp has pointer to first operation */ - add $8, %esp -again: - /* load length of additional data */ - mov 0x0(%esp), %eax - - /* if(length == 0) : end of list */ - /* write possible 0 to header */ - mov %eax, 0x4(%ecx) - cmpl $0, %eax - jz done - - /* save current pointer */ - mov %esp, 0x4(%ecx) - - /* skip additional data */ - add %eax, %esp - - /* load syscall-# */ - pop %eax - - /* load syscall params */ - pop %ebx - pop %ecx - pop %edx - pop %esi - pop %edi - pop %ebp - - /* execute syscall */ - int $0x80 - - /* restore top of page pointer in %ecx */ - mov %esp, %ecx - andl $(~UM_KERN_PAGE_SIZE) + 1, %ecx - - /* check return value */ - pop %ebx - cmp %ebx, %eax - je again - -done: - /* save return value */ - mov %eax, (%ecx) - - /* stop */ - int3 diff --git a/arch/x86/um/stub_64.S b/arch/x86/um/stub_64.S deleted file mode 100644 index f3404640197a..000000000000 --- a/arch/x86/um/stub_64.S +++ /dev/null @@ -1,50 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0 */ -#include <as-layout.h> - -.section .__syscall_stub, "ax" - .globl batch_syscall_stub -batch_syscall_stub: - /* %rsp has the pointer to first operation */ - mov %rsp, %rbx - add $0x10, %rsp -again: - /* load length of additional data */ - mov 0x0(%rsp), %rax - - /* if(length == 0) : end of list */ - /* write possible 0 to header */ - mov %rax, 8(%rbx) - cmp $0, %rax - jz done - - /* save current pointer */ - mov %rsp, 8(%rbx) - - /* skip additional data */ - add %rax, %rsp - - /* load syscall-# */ - pop %rax - - /* load syscall params */ - pop %rdi - pop %rsi - pop %rdx - pop %r10 - pop %r8 - pop %r9 - - /* execute syscall */ - syscall - - /* check return value */ - pop %rcx - cmp %rcx, %rax - je again - -done: - /* save return value */ - mov %rax, (%rbx) - - /* stop */ - int3 |