diff options
Diffstat (limited to 'fs/proc')
-rw-r--r-- | fs/proc/array.c | 2 | ||||
-rw-r--r-- | fs/proc/base.c | 33 | ||||
-rw-r--r-- | fs/proc/proc_misc.c | 6 | ||||
-rw-r--r-- | fs/proc/task_mmu.c | 111 |
4 files changed, 93 insertions, 59 deletions
diff --git a/fs/proc/array.c b/fs/proc/array.c index 9e3b8c3..797d775 100644 --- a/fs/proc/array.c +++ b/fs/proc/array.c @@ -288,7 +288,7 @@ static void render_cap_t(struct seq_file *m, const char *header, seq_printf(m, "%s", header); CAP_FOR_EACH_U32(__capi) { seq_printf(m, "%08x", - a->cap[(_LINUX_CAPABILITY_U32S-1) - __capi]); + a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]); } seq_printf(m, "\n"); } diff --git a/fs/proc/base.c b/fs/proc/base.c index c447e07..3b45537 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -127,6 +127,25 @@ struct pid_entry { NULL, &proc_single_file_operations, \ { .proc_show = &proc_##OTYPE } ) +/* + * Count the number of hardlinks for the pid_entry table, excluding the . + * and .. links. + */ +static unsigned int pid_entry_count_dirs(const struct pid_entry *entries, + unsigned int n) +{ + unsigned int i; + unsigned int count; + + count = 0; + for (i = 0; i < n; ++i) { + if (S_ISDIR(entries[i].mode)) + ++count; + } + + return count; +} + int maps_protect; EXPORT_SYMBOL(maps_protect); @@ -2585,10 +2604,9 @@ static struct dentry *proc_pid_instantiate(struct inode *dir, inode->i_op = &proc_tgid_base_inode_operations; inode->i_fop = &proc_tgid_base_operations; inode->i_flags|=S_IMMUTABLE; - inode->i_nlink = 5; -#ifdef CONFIG_SECURITY - inode->i_nlink += 1; -#endif + + inode->i_nlink = 2 + pid_entry_count_dirs(tgid_base_stuff, + ARRAY_SIZE(tgid_base_stuff)); dentry->d_op = &pid_dentry_operations; @@ -2816,10 +2834,9 @@ static struct dentry *proc_task_instantiate(struct inode *dir, inode->i_op = &proc_tid_base_inode_operations; inode->i_fop = &proc_tid_base_operations; inode->i_flags|=S_IMMUTABLE; - inode->i_nlink = 4; -#ifdef CONFIG_SECURITY - inode->i_nlink += 1; -#endif + + inode->i_nlink = 2 + pid_entry_count_dirs(tid_base_stuff, + ARRAY_SIZE(tid_base_stuff)); dentry->d_op = &pid_dentry_operations; diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c index 32dc14c..7e277f2 100644 --- a/fs/proc/proc_misc.c +++ b/fs/proc/proc_misc.c @@ -716,7 +716,7 @@ static ssize_t kpagecount_read(struct file *file, char __user *buf, pfn = src / KPMSIZE; count = min_t(size_t, count, (max_pfn * KPMSIZE) - src); if (src & KPMMASK || count & KPMMASK) - return -EIO; + return -EINVAL; while (count > 0) { ppage = NULL; @@ -726,7 +726,7 @@ static ssize_t kpagecount_read(struct file *file, char __user *buf, if (!ppage) pcount = 0; else - pcount = atomic_read(&ppage->_count); + pcount = page_mapcount(ppage); if (put_user(pcount, out++)) { ret = -EFAULT; @@ -782,7 +782,7 @@ static ssize_t kpageflags_read(struct file *file, char __user *buf, pfn = src / KPMSIZE; count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src); if (src & KPMMASK || count & KPMMASK) - return -EIO; + return -EINVAL; while (count > 0) { ppage = NULL; diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 88717c0..ab8ccc9 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -315,9 +315,9 @@ struct mem_size_stats { }; static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, - void *private) + struct mm_walk *walk) { - struct mem_size_stats *mss = private; + struct mem_size_stats *mss = walk->private; struct vm_area_struct *vma = mss->vma; pte_t *pte, ptent; spinlock_t *ptl; @@ -365,19 +365,21 @@ static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, return 0; } -static struct mm_walk smaps_walk = { .pmd_entry = smaps_pte_range }; - static int show_smap(struct seq_file *m, void *v) { struct vm_area_struct *vma = v; struct mem_size_stats mss; int ret; + struct mm_walk smaps_walk = { + .pmd_entry = smaps_pte_range, + .mm = vma->vm_mm, + .private = &mss, + }; memset(&mss, 0, sizeof mss); mss.vma = vma; if (vma->vm_mm && !is_vm_hugetlb_page(vma)) - walk_page_range(vma->vm_mm, vma->vm_start, vma->vm_end, - &smaps_walk, &mss); + walk_page_range(vma->vm_start, vma->vm_end, &smaps_walk); ret = show_map(m, v); if (ret) @@ -426,9 +428,9 @@ const struct file_operations proc_smaps_operations = { }; static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, - unsigned long end, void *private) + unsigned long end, struct mm_walk *walk) { - struct vm_area_struct *vma = private; + struct vm_area_struct *vma = walk->private; pte_t *pte, ptent; spinlock_t *ptl; struct page *page; @@ -452,8 +454,6 @@ static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, return 0; } -static struct mm_walk clear_refs_walk = { .pmd_entry = clear_refs_pte_range }; - static ssize_t clear_refs_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { @@ -476,11 +476,17 @@ static ssize_t clear_refs_write(struct file *file, const char __user *buf, return -ESRCH; mm = get_task_mm(task); if (mm) { + static struct mm_walk clear_refs_walk; + memset(&clear_refs_walk, 0, sizeof(clear_refs_walk)); + clear_refs_walk.pmd_entry = clear_refs_pte_range; + clear_refs_walk.mm = mm; down_read(&mm->mmap_sem); - for (vma = mm->mmap; vma; vma = vma->vm_next) + for (vma = mm->mmap; vma; vma = vma->vm_next) { + clear_refs_walk.private = vma; if (!is_vm_hugetlb_page(vma)) - walk_page_range(mm, vma->vm_start, vma->vm_end, - &clear_refs_walk, vma); + walk_page_range(vma->vm_start, vma->vm_end, + &clear_refs_walk); + } flush_tlb_mm(mm); up_read(&mm->mmap_sem); mmput(mm); @@ -496,7 +502,7 @@ const struct file_operations proc_clear_refs_operations = { }; struct pagemapread { - char __user *out, *end; + u64 __user *out, *end; }; #define PM_ENTRY_BYTES sizeof(u64) @@ -519,28 +525,18 @@ struct pagemapread { static int add_to_pagemap(unsigned long addr, u64 pfn, struct pagemapread *pm) { - /* - * Make sure there's room in the buffer for an - * entire entry. Otherwise, only copy part of - * the pfn. - */ - if (pm->out + PM_ENTRY_BYTES >= pm->end) { - if (copy_to_user(pm->out, &pfn, pm->end - pm->out)) - return -EFAULT; - pm->out = pm->end; - return PM_END_OF_BUFFER; - } - if (put_user(pfn, pm->out)) return -EFAULT; - pm->out += PM_ENTRY_BYTES; + pm->out++; + if (pm->out >= pm->end) + return PM_END_OF_BUFFER; return 0; } static int pagemap_pte_hole(unsigned long start, unsigned long end, - void *private) + struct mm_walk *walk) { - struct pagemapread *pm = private; + struct pagemapread *pm = walk->private; unsigned long addr; int err = 0; for (addr = start; addr < end; addr += PAGE_SIZE) { @@ -557,24 +553,45 @@ static u64 swap_pte_to_pagemap_entry(pte_t pte) return swp_type(e) | (swp_offset(e) << MAX_SWAPFILES_SHIFT); } +static unsigned long pte_to_pagemap_entry(pte_t pte) +{ + unsigned long pme = 0; + if (is_swap_pte(pte)) + pme = PM_PFRAME(swap_pte_to_pagemap_entry(pte)) + | PM_PSHIFT(PAGE_SHIFT) | PM_SWAP; + else if (pte_present(pte)) + pme = PM_PFRAME(pte_pfn(pte)) + | PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT; + return pme; +} + static int pagemap_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, - void *private) + struct mm_walk *walk) { - struct pagemapread *pm = private; + struct vm_area_struct *vma; + struct pagemapread *pm = walk->private; pte_t *pte; int err = 0; + /* find the first VMA at or above 'addr' */ + vma = find_vma(walk->mm, addr); for (; addr != end; addr += PAGE_SIZE) { u64 pfn = PM_NOT_PRESENT; - pte = pte_offset_map(pmd, addr); - if (is_swap_pte(*pte)) - pfn = PM_PFRAME(swap_pte_to_pagemap_entry(*pte)) - | PM_PSHIFT(PAGE_SHIFT) | PM_SWAP; - else if (pte_present(*pte)) - pfn = PM_PFRAME(pte_pfn(*pte)) - | PM_PSHIFT(PAGE_SHIFT) | PM_PRESENT; - /* unmap so we're not in atomic when we copy to userspace */ - pte_unmap(pte); + + /* check to see if we've left 'vma' behind + * and need a new, higher one */ + if (vma && (addr >= vma->vm_end)) + vma = find_vma(walk->mm, addr); + + /* check that 'vma' actually covers this address, + * and that it isn't a huge page vma */ + if (vma && (vma->vm_start <= addr) && + !is_vm_hugetlb_page(vma)) { + pte = pte_offset_map(pmd, addr); + pfn = pte_to_pagemap_entry(*pte); + /* unmap before userspace copy */ + pte_unmap(pte); + } err = add_to_pagemap(addr, pfn, pm); if (err) return err; @@ -634,7 +651,7 @@ static ssize_t pagemap_read(struct file *file, char __user *buf, ret = -EINVAL; /* file position must be aligned */ - if (*ppos % PM_ENTRY_BYTES) + if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES)) goto out_task; ret = 0; @@ -664,8 +681,8 @@ static ssize_t pagemap_read(struct file *file, char __user *buf, goto out_pages; } - pm.out = buf; - pm.end = buf + count; + pm.out = (u64 *)buf; + pm.end = (u64 *)(buf + count); if (!ptrace_may_attach(task)) { ret = -EIO; @@ -685,14 +702,14 @@ static ssize_t pagemap_read(struct file *file, char __user *buf, * user buffer is tracked in "pm", and the walk * will stop when we hit the end of the buffer. */ - ret = walk_page_range(mm, start_vaddr, end_vaddr, - &pagemap_walk, &pm); + ret = walk_page_range(start_vaddr, end_vaddr, + &pagemap_walk); if (ret == PM_END_OF_BUFFER) ret = 0; /* don't need mmap_sem for these, but this looks cleaner */ - *ppos += pm.out - buf; + *ppos += (char *)pm.out - buf; if (!ret) - ret = pm.out - buf; + ret = (char *)pm.out - buf; } out_pages: |