diff options
Diffstat (limited to 'arch/um/sys-i386/ldt.c')
-rw-r--r-- | arch/um/sys-i386/ldt.c | 61 |
1 files changed, 43 insertions, 18 deletions
diff --git a/arch/um/sys-i386/ldt.c b/arch/um/sys-i386/ldt.c index 6360f1c958d0..0cdfd4481d5e 100644 --- a/arch/um/sys-i386/ldt.c +++ b/arch/um/sys-i386/ldt.c @@ -16,6 +16,8 @@ #include "choose-mode.h" #include "kern.h" #include "mode_kern.h" +#include "proc_mm.h" +#include "os.h" extern int modify_ldt(int func, void *ptr, unsigned long bytecount); @@ -228,7 +230,7 @@ static int read_ldt(void __user * ptr, unsigned long bytecount) size = LDT_ENTRY_SIZE*LDT_DIRECT_ENTRIES; if(size > bytecount) size = bytecount; - if(copy_to_user(ptr, ldt->entries, size)) + if(copy_to_user(ptr, ldt->u.entries, size)) err = -EFAULT; bytecount -= size; ptr += size; @@ -239,7 +241,7 @@ static int read_ldt(void __user * ptr, unsigned long bytecount) size = PAGE_SIZE; if(size > bytecount) size = bytecount; - if(copy_to_user(ptr, ldt->pages[i], size)){ + if(copy_to_user(ptr, ldt->u.pages[i], size)){ err = -EFAULT; break; } @@ -321,10 +323,11 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int func) i*LDT_ENTRIES_PER_PAGE <= ldt_info.entry_number; i++){ if(i == 0) - memcpy(&entry0, ldt->entries, sizeof(entry0)); - ldt->pages[i] = (struct ldt_entry *) - __get_free_page(GFP_KERNEL|__GFP_ZERO); - if(!ldt->pages[i]){ + memcpy(&entry0, ldt->u.entries, + sizeof(entry0)); + ldt->u.pages[i] = (struct ldt_entry *) + __get_free_page(GFP_KERNEL|__GFP_ZERO); + if(!ldt->u.pages[i]){ err = -ENOMEM; /* Undo the change in host */ memset(&ldt_info, 0, sizeof(ldt_info)); @@ -332,8 +335,9 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int func) goto out_unlock; } if(i == 0) { - memcpy(ldt->pages[0], &entry0, sizeof(entry0)); - memcpy(ldt->pages[0]+1, ldt->entries+1, + memcpy(ldt->u.pages[0], &entry0, + sizeof(entry0)); + memcpy(ldt->u.pages[0]+1, ldt->u.entries+1, sizeof(entry0)*(LDT_DIRECT_ENTRIES-1)); } ldt->entry_count = (i + 1) * LDT_ENTRIES_PER_PAGE; @@ -343,9 +347,9 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int func) ldt->entry_count = ldt_info.entry_number + 1; if(ldt->entry_count <= LDT_DIRECT_ENTRIES) - ldt_p = ldt->entries + ldt_info.entry_number; + ldt_p = ldt->u.entries + ldt_info.entry_number; else - ldt_p = ldt->pages[ldt_info.entry_number/LDT_ENTRIES_PER_PAGE] + + ldt_p = ldt->u.pages[ldt_info.entry_number/LDT_ENTRIES_PER_PAGE] + ldt_info.entry_number%LDT_ENTRIES_PER_PAGE; if(ldt_info.base_addr == 0 && ldt_info.limit == 0 && @@ -454,13 +458,14 @@ long init_new_ldt(struct mmu_context_skas * new_mm, int i; long page, err=0; void *addr = NULL; + struct proc_mm_op copy; - memset(&desc, 0, sizeof(desc)); if(!ptrace_ldt) init_MUTEX(&new_mm->ldt.semaphore); if(!from_mm){ + memset(&desc, 0, sizeof(desc)); /* * We have to initialize a clean ldt. */ @@ -492,8 +497,26 @@ long init_new_ldt(struct mmu_context_skas * new_mm, } } new_mm->ldt.entry_count = 0; + + goto out; } - else if (!ptrace_ldt) { + + if(proc_mm){ + /* We have a valid from_mm, so we now have to copy the LDT of + * from_mm to new_mm, because using proc_mm an new mm with + * an empty/default LDT was created in new_mm() + */ + copy = ((struct proc_mm_op) { .op = MM_COPY_SEGMENTS, + .u = + { .copy_segments = + from_mm->id.u.mm_fd } } ); + i = os_write_file(new_mm->id.u.mm_fd, ©, sizeof(copy)); + if(i != sizeof(copy)) + printk("new_mm : /proc/mm copy_segments failed, " + "err = %d\n", -i); + } + + if(!ptrace_ldt) { /* Our local LDT is used to supply the data for * modify_ldt(READLDT), if PTRACE_LDT isn't available, * i.e., we have to use the stub for modify_ldt, which @@ -501,8 +524,8 @@ long init_new_ldt(struct mmu_context_skas * new_mm, */ down(&from_mm->ldt.semaphore); if(from_mm->ldt.entry_count <= LDT_DIRECT_ENTRIES){ - memcpy(new_mm->ldt.entries, from_mm->ldt.entries, - sizeof(new_mm->ldt.entries)); + memcpy(new_mm->ldt.u.entries, from_mm->ldt.u.entries, + sizeof(new_mm->ldt.u.entries)); } else{ i = from_mm->ldt.entry_count / LDT_ENTRIES_PER_PAGE; @@ -512,15 +535,17 @@ long init_new_ldt(struct mmu_context_skas * new_mm, err = -ENOMEM; break; } - new_mm->ldt.pages[i] = (struct ldt_entry*)page; - memcpy(new_mm->ldt.pages[i], - from_mm->ldt.pages[i], PAGE_SIZE); + new_mm->ldt.u.pages[i] = + (struct ldt_entry *) page; + memcpy(new_mm->ldt.u.pages[i], + from_mm->ldt.u.pages[i], PAGE_SIZE); } } new_mm->ldt.entry_count = from_mm->ldt.entry_count; up(&from_mm->ldt.semaphore); } + out: return err; } @@ -532,7 +557,7 @@ void free_ldt(struct mmu_context_skas * mm) if(!ptrace_ldt && mm->ldt.entry_count > LDT_DIRECT_ENTRIES){ i = mm->ldt.entry_count / LDT_ENTRIES_PER_PAGE; while(i-- > 0){ - free_page((long )mm->ldt.pages[i]); + free_page((long )mm->ldt.u.pages[i]); } } mm->ldt.entry_count = 0; |