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-rw-r--r--fs/proc/cmdline.c6
-rw-r--r--fs/proc/consoles.c21
-rw-r--r--fs/proc/fd.c45
-rw-r--r--fs/proc/kcore.c33
-rw-r--r--fs/proc/meminfo.c2
-rw-r--r--fs/proc/task_mmu.c18
-rw-r--r--fs/proc/vmcore.c7
7 files changed, 96 insertions, 36 deletions
diff --git a/fs/proc/cmdline.c b/fs/proc/cmdline.c
index fa762c5fbcb2..91fe1597af7b 100644
--- a/fs/proc/cmdline.c
+++ b/fs/proc/cmdline.c
@@ -3,6 +3,7 @@
#include <linux/init.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
+#include "internal.h"
static int cmdline_proc_show(struct seq_file *m, void *v)
{
@@ -13,7 +14,10 @@ static int cmdline_proc_show(struct seq_file *m, void *v)
static int __init proc_cmdline_init(void)
{
- proc_create_single("cmdline", 0, NULL, cmdline_proc_show);
+ struct proc_dir_entry *pde;
+
+ pde = proc_create_single("cmdline", 0, NULL, cmdline_proc_show);
+ pde->size = saved_command_line_len + 1;
return 0;
}
fs_initcall(proc_cmdline_init);
diff --git a/fs/proc/consoles.c b/fs/proc/consoles.c
index dfe6ce3505ce..e0758fe7936d 100644
--- a/fs/proc/consoles.c
+++ b/fs/proc/consoles.c
@@ -33,7 +33,16 @@ static int show_console_dev(struct seq_file *m, void *v)
if (con->device) {
const struct tty_driver *driver;
int index;
+
+ /*
+ * Take console_lock to serialize device() callback with
+ * other console operations. For example, fg_console is
+ * modified under console_lock when switching vt.
+ */
+ console_lock();
driver = con->device(con, &index);
+ console_unlock();
+
if (driver) {
dev = MKDEV(driver->major, driver->minor_start);
dev += index;
@@ -63,7 +72,12 @@ static void *c_start(struct seq_file *m, loff_t *pos)
struct console *con;
loff_t off = 0;
- console_lock();
+ /*
+ * Hold the console_list_lock to guarantee safe traversal of the
+ * console list. SRCU cannot be used because there is no
+ * place to store the SRCU cookie.
+ */
+ console_list_lock();
for_each_console(con)
if (off++ == *pos)
break;
@@ -74,13 +88,14 @@ static void *c_start(struct seq_file *m, loff_t *pos)
static void *c_next(struct seq_file *m, void *v, loff_t *pos)
{
struct console *con = v;
+
++*pos;
- return con->next;
+ return hlist_entry_safe(con->node.next, struct console, node);
}
static void c_stop(struct seq_file *m, void *v)
{
- console_unlock();
+ console_list_unlock();
}
static const struct seq_operations consoles_op = {
diff --git a/fs/proc/fd.c b/fs/proc/fd.c
index 913bef0d2a36..fc46d6fe080c 100644
--- a/fs/proc/fd.c
+++ b/fs/proc/fd.c
@@ -7,6 +7,7 @@
#include <linux/namei.h>
#include <linux/pid.h>
#include <linux/ptrace.h>
+#include <linux/bitmap.h>
#include <linux/security.h>
#include <linux/file.h>
#include <linux/seq_file.h>
@@ -279,6 +280,30 @@ out:
return 0;
}
+static int proc_readfd_count(struct inode *inode, loff_t *count)
+{
+ struct task_struct *p = get_proc_task(inode);
+ struct fdtable *fdt;
+
+ if (!p)
+ return -ENOENT;
+
+ task_lock(p);
+ if (p->files) {
+ rcu_read_lock();
+
+ fdt = files_fdtable(p->files);
+ *count = bitmap_weight(fdt->open_fds, fdt->max_fds);
+
+ rcu_read_unlock();
+ }
+ task_unlock(p);
+
+ put_task_struct(p);
+
+ return 0;
+}
+
static int proc_readfd(struct file *file, struct dir_context *ctx)
{
return proc_readfd_common(file, ctx, proc_fd_instantiate);
@@ -319,9 +344,29 @@ int proc_fd_permission(struct user_namespace *mnt_userns,
return rv;
}
+static int proc_fd_getattr(struct user_namespace *mnt_userns,
+ const struct path *path, struct kstat *stat,
+ u32 request_mask, unsigned int query_flags)
+{
+ struct inode *inode = d_inode(path->dentry);
+ int rv = 0;
+
+ generic_fillattr(&init_user_ns, inode, stat);
+
+ /* If it's a directory, put the number of open fds there */
+ if (S_ISDIR(inode->i_mode)) {
+ rv = proc_readfd_count(inode, &stat->size);
+ if (rv < 0)
+ return rv;
+ }
+
+ return rv;
+}
+
const struct inode_operations proc_fd_inode_operations = {
.lookup = proc_lookupfd,
.permission = proc_fd_permission,
+ .getattr = proc_fd_getattr,
.setattr = proc_setattr,
};
diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index dff921f7ca33..71157ee35c1a 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -18,7 +18,6 @@
#include <linux/capability.h>
#include <linux/elf.h>
#include <linux/elfcore.h>
-#include <linux/notifier.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>
#include <linux/printk.h>
@@ -541,25 +540,17 @@ read_kcore(struct file *file, char __user *buffer, size_t buflen, loff_t *fpos)
fallthrough;
case KCORE_VMEMMAP:
case KCORE_TEXT:
- if (kern_addr_valid(start)) {
- /*
- * Using bounce buffer to bypass the
- * hardened user copy kernel text checks.
- */
- if (copy_from_kernel_nofault(buf, (void *)start,
- tsz)) {
- if (clear_user(buffer, tsz)) {
- ret = -EFAULT;
- goto out;
- }
- } else {
- if (copy_to_user(buffer, buf, tsz)) {
- ret = -EFAULT;
- goto out;
- }
+ /*
+ * Using bounce buffer to bypass the
+ * hardened user copy kernel text checks.
+ */
+ if (copy_from_kernel_nofault(buf, (void *)start, tsz)) {
+ if (clear_user(buffer, tsz)) {
+ ret = -EFAULT;
+ goto out;
}
} else {
- if (clear_user(buffer, tsz)) {
+ if (copy_to_user(buffer, buf, tsz)) {
ret = -EFAULT;
goto out;
}
@@ -638,10 +629,6 @@ static int __meminit kcore_callback(struct notifier_block *self,
return NOTIFY_OK;
}
-static struct notifier_block kcore_callback_nb __meminitdata = {
- .notifier_call = kcore_callback,
- .priority = 0,
-};
static struct kcore_list kcore_vmalloc;
@@ -694,7 +681,7 @@ static int __init proc_kcore_init(void)
add_modules_range();
/* Store direct-map area from physical memory map */
kcore_update_ram();
- register_hotmemory_notifier(&kcore_callback_nb);
+ hotplug_memory_notifier(kcore_callback, DEFAULT_CALLBACK_PRI);
return 0;
}
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 5101131e6047..440960110a42 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -115,7 +115,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
#endif
show_val_kb(m, "PageTables: ",
global_node_page_state(NR_PAGETABLE));
- show_val_kb(m, "SecPageTables: ",
+ show_val_kb(m, "SecPageTables: ",
global_node_page_state(NR_SECONDARY_PAGETABLE));
show_val_kb(m, "NFS_Unstable: ", 0);
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 8b4f3073f8f5..e35a0398db63 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -274,6 +274,7 @@ static void show_vma_header_prefix(struct seq_file *m,
static void
show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
{
+ struct anon_vma_name *anon_name = NULL;
struct mm_struct *mm = vma->vm_mm;
struct file *file = vma->vm_file;
vm_flags_t flags = vma->vm_flags;
@@ -293,6 +294,8 @@ show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
start = vma->vm_start;
end = vma->vm_end;
show_vma_header_prefix(m, start, end, flags, pgoff, dev, ino);
+ if (mm)
+ anon_name = anon_vma_name(vma);
/*
* Print the dentry name for named mappings, and a
@@ -300,7 +303,14 @@ show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
*/
if (file) {
seq_pad(m, ' ');
- seq_file_path(m, file, "\n");
+ /*
+ * If user named this anon shared memory via
+ * prctl(PR_SET_VMA ..., use the provided name.
+ */
+ if (anon_name)
+ seq_printf(m, "[anon_shmem:%s]", anon_name->name);
+ else
+ seq_file_path(m, file, "\n");
goto done;
}
@@ -312,8 +322,6 @@ show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
name = arch_vma_name(vma);
if (!name) {
- struct anon_vma_name *anon_name;
-
if (!mm) {
name = "[vdso]";
goto done;
@@ -330,7 +338,6 @@ show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
goto done;
}
- anon_name = anon_vma_name(vma);
if (anon_name) {
seq_pad(m, ' ');
seq_printf(m, "[anon:%s]", anon_name->name);
@@ -667,6 +674,7 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
[ilog2(VM_RAND_READ)] = "rr",
[ilog2(VM_DONTCOPY)] = "dc",
[ilog2(VM_DONTEXPAND)] = "de",
+ [ilog2(VM_LOCKONFAULT)] = "lf",
[ilog2(VM_ACCOUNT)] = "ac",
[ilog2(VM_NORESERVE)] = "nr",
[ilog2(VM_HUGETLB)] = "ht",
@@ -902,7 +910,7 @@ static int show_smaps_rollup(struct seq_file *m, void *v)
goto out_put_mm;
hold_task_mempolicy(priv);
- vma = mas_find(&mas, 0);
+ vma = mas_find(&mas, ULONG_MAX);
if (unlikely(!vma))
goto empty_set;
diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index f2aa86c421f2..09a81e4b1273 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -199,7 +199,7 @@ ssize_t __weak elfcorehdr_read(char *buf, size_t count, u64 *ppos)
struct kvec kvec = { .iov_base = buf, .iov_len = count };
struct iov_iter iter;
- iov_iter_kvec(&iter, READ, &kvec, 1, count);
+ iov_iter_kvec(&iter, ITER_DEST, &kvec, 1, count);
return read_from_oldmem(&iter, count, ppos, false);
}
@@ -212,7 +212,7 @@ ssize_t __weak elfcorehdr_read_notes(char *buf, size_t count, u64 *ppos)
struct kvec kvec = { .iov_base = buf, .iov_len = count };
struct iov_iter iter;
- iov_iter_kvec(&iter, READ, &kvec, 1, count);
+ iov_iter_kvec(&iter, ITER_DEST, &kvec, 1, count);
return read_from_oldmem(&iter, count, ppos,
cc_platform_has(CC_ATTR_MEM_ENCRYPT));
@@ -437,7 +437,7 @@ static vm_fault_t mmap_vmcore_fault(struct vm_fault *vmf)
offset = (loff_t) index << PAGE_SHIFT;
kvec.iov_base = page_address(page);
kvec.iov_len = PAGE_SIZE;
- iov_iter_kvec(&iter, READ, &kvec, 1, PAGE_SIZE);
+ iov_iter_kvec(&iter, ITER_DEST, &kvec, 1, PAGE_SIZE);
rc = __read_vmcore(&iter, &offset);
if (rc < 0) {
@@ -1567,6 +1567,7 @@ static int __init vmcore_init(void)
return rc;
rc = parse_crash_elf_headers();
if (rc) {
+ elfcorehdr_free(elfcorehdr_addr);
pr_warn("Kdump: vmcore not initialized\n");
return rc;
}
generated by cgit v1.2.3 (git 2.46.0) at 2025-08-25 17:33:49 +0000