projects/linux·commit faf145d6

Merge branch 'exec-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

faf145d6 · Linus Torvalds <[email protected]> · 2020-12-15 19:29:43 -08:00

Pull execve updates from Eric Biederman:
 "This set of changes ultimately fixes the interaction of posix file
  lock and exec. Fundamentally most of the change is just moving where
  unshare_files is called during exec, and tweaking the users of
  files_struct so that the count of files_struct is not unnecessarily
  played with.

  Along the way fcheck and related helpers were renamed to more
  accurately reflect what they do.

  There were also many other small changes that fell out, as this is the
  first time in a long time much of this code has been touched.

  Benchmarks haven't turned up any practical issues but Al Viro has
  observed a possibility for a lot of pounding on task_lock. So I have
  some changes in progress to convert put_files_struct to always rcu
  free files_struct. That wasn't ready for the merge window so that will
  have to wait until next time"

* 'exec-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace: (27 commits)
  exec: Move io_uring_task_cancel after the point of no return
  coredump: Document coredump code exclusively used by cell spufs
  file: Remove get_files_struct
  file: Rename __close_fd_get_file close_fd_get_file
  file: Replace ksys_close with close_fd
  file: Rename __close_fd to close_fd and remove the files parameter
  file: Merge __alloc_fd into alloc_fd
  file: In f_dupfd read RLIMIT_NOFILE once.
  file: Merge __fd_install into fd_install
  proc/fd: In fdinfo seq_show don't use get_files_struct
  bpf/task_iter: In task_file_seq_get_next use task_lookup_next_fd_rcu
  proc/fd: In proc_readfd_common use task_lookup_next_fd_rcu
  file: Implement task_lookup_next_fd_rcu
  kcmp: In get_file_raw_ptr use task_lookup_fd_rcu
  proc/fd: In tid_fd_mode use task_lookup_fd_rcu
  file: Implement task_lookup_fd_rcu
  file: Rename fcheck lookup_fd_rcu
  file: Replace fcheck_files with files_lookup_fd_rcu
  file: Factor files_lookup_fd_locked out of fcheck_files
  file: Rename __fcheck_files to files_lookup_fd_raw
  ...
Commit
faf145d6f3f3d6f2c066f65602ba9d0a03106915
Parents
6febd8be · 9ee1206d

Merge commit. Changes below are compared with the first parent: 6febd8be.

Changes

19 files changed · +158 −244

FileStatusAddDelContent
Documentation/filesystems/files.rstmodified+4−4View file
arch/powerpc/platforms/cell/spufs/coredump.cmodified+1−1View file
drivers/android/binder.cmodified+1−1View file
fs/autofs/dev-ioctl.cmodified+3−2View file
fs/binfmt_elf.cmodified+2−0View file
fs/coredump.cmodified+2−4View file
fs/exec.cmodified+18−21View file
fs/file.cmodified+58−66View file
fs/io_uring.cmodified+1−1View file
fs/locks.cmodified+8−6View file
fs/notify/dnotify/dnotify.cmodified+1−1View file
fs/open.cmodified+1−1View file
fs/proc/fd.cmodified+15−33View file
include/linux/fdtable.hmodified+21−19View file
include/linux/syscalls.hmodified+0−12View file
kernel/bpf/syscall.cmodified+3−17View file
kernel/bpf/task_iter.cmodified+7−26View file
kernel/fork.cmodified+6−6View file
kernel/kcmp.cmodified+6−23View file

Only the first 600 diff lines are shown. Download the complete patch.

Documentation/filesystems/files.rst

View file
diff --git a/Documentation/filesystems/files.rst b/Documentation/filesystems/files.rst
index cbf8e57..bcf8445 100644
--- a/Documentation/filesystems/files.rst
+++ b/Documentation/filesystems/files.rst
@@ -62,7 +62,7 @@ the fdtable structure -
be held.
4. To look up the file structure given an fd, a reader
- must use either fcheck() or fcheck_files() APIs. These
+ must use either lookup_fd_rcu() or files_lookup_fd_rcu() APIs. These
take care of barrier requirements due to lock-free lookup.
An example::
@@ -70,7 +70,7 @@ the fdtable structure -
struct file *file;
rcu_read_lock();
- file = fcheck(fd);
+ file = lookup_fd_rcu(fd);
if (file) {
...
}
@@ -84,7 +84,7 @@ the fdtable structure -
on ->f_count::
rcu_read_lock();
- file = fcheck_files(files, fd);
+ file = files_lookup_fd_rcu(files, fd);
if (file) {
if (atomic_long_inc_not_zero(&file->f_count))
*fput_needed = 1;
@@ -104,7 +104,7 @@ the fdtable structure -
lock-free, they must be installed using rcu_assign_pointer()
API. If they are looked up lock-free, rcu_dereference()
must be used. However it is advisable to use files_fdtable()
- and fcheck()/fcheck_files() which take care of these issues.
+ and lookup_fd_rcu()/files_lookup_fd_rcu() which take care of these issues.
7. While updating, the fdtable pointer must be looked up while
holding files->file_lock. If ->file_lock is dropped, then

arch/powerpc/platforms/cell/spufs/coredump.c

View file
diff --git a/arch/powerpc/platforms/cell/spufs/coredump.c b/arch/powerpc/platforms/cell/spufs/coredump.c
index 026c181..60b5583 100644
--- a/arch/powerpc/platforms/cell/spufs/coredump.c
+++ b/arch/powerpc/platforms/cell/spufs/coredump.c
@@ -74,7 +74,7 @@ static struct spu_context *coredump_next_context(int *fd)
*fd = n - 1;
rcu_read_lock();
- file = fcheck(*fd);
+ file = lookup_fd_rcu(*fd);
ctx = SPUFS_I(file_inode(file))->i_ctx;
get_spu_context(ctx);
rcu_read_unlock();

drivers/android/binder.c

View file
diff --git a/drivers/android/binder.c b/drivers/android/binder.c
index 1338209..c119736 100644
--- a/drivers/android/binder.c
+++ b/drivers/android/binder.c
@@ -1836,7 +1836,7 @@ static void binder_deferred_fd_close(int fd)
if (!twcb)
return;
init_task_work(&twcb->twork, binder_do_fd_close);
- __close_fd_get_file(fd, &twcb->file);
+ close_fd_get_file(fd, &twcb->file);
if (twcb->file) {
filp_close(twcb->file, current->files);
task_work_add(current, &twcb->twork, TWA_RESUME);

fs/autofs/dev-ioctl.c

View file
diff --git a/fs/autofs/dev-ioctl.c b/fs/autofs/dev-ioctl.c
index 322b7df..5bf781e 100644
--- a/fs/autofs/dev-ioctl.c
+++ b/fs/autofs/dev-ioctl.c
@@ -4,9 +4,10 @@
* Copyright 2008 Ian Kent <[email protected]>
*/
+#include <linux/module.h>
#include <linux/miscdevice.h>
#include <linux/compat.h>
-#include <linux/syscalls.h>
+#include <linux/fdtable.h>
#include <linux/magic.h>
#include <linux/nospec.h>
@@ -289,7 +290,7 @@ static int autofs_dev_ioctl_closemount(struct file *fp,
struct autofs_sb_info *sbi,
struct autofs_dev_ioctl *param)
{
- return ksys_close(param->ioctlfd);
+ return close_fd(param->ioctlfd);
}
/*

fs/binfmt_elf.c

View file
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index ac0b5fc..950bc17 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -2198,6 +2198,7 @@ static int elf_core_dump(struct coredump_params *cprm)
{
size_t sz = get_note_info_size(&info);
+ /* For cell spufs */
sz += elf_coredump_extra_notes_size();
phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
@@ -2261,6 +2262,7 @@ static int elf_core_dump(struct coredump_params *cprm)
if (!write_note_info(&info, cprm))
goto end_coredump;
+ /* For cell spufs */
if (elf_coredump_extra_notes_write(cprm))
goto end_coredump;

fs/coredump.c

View file
diff --git a/fs/coredump.c b/fs/coredump.c
index c6acfc6..a2f6ecc 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -586,7 +586,6 @@ void do_coredump(const kernel_siginfo_t *siginfo)
int ispipe;
size_t *argv = NULL;
int argc = 0;
- struct files_struct *displaced;
/* require nonrelative corefile path and be extra careful */
bool need_suid_safe = false;
bool core_dumped = false;
@@ -792,11 +791,10 @@ void do_coredump(const kernel_siginfo_t *siginfo)
}
/* get us an unshared descriptor table; almost always a no-op */
- retval = unshare_files(&displaced);
+ /* The cell spufs coredump code reads the file descriptor tables */
+ retval = unshare_files();
if (retval)
goto close_fail;
- if (displaced)
- put_files_struct(displaced);
if (!dump_interrupted()) {
/*
* umh disabled with CONFIG_STATIC_USERMODEHELPER_PATH="" would

fs/exec.c

View file
diff --git a/fs/exec.c b/fs/exec.c
index aee36e5..81b85f7 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1259,6 +1259,16 @@ int begin_new_exec(struct linux_binprm * bprm)
goto out;
/*
+ * Cancel any io_uring activity across execve
+ */
+ io_uring_task_cancel();
+
+ /* Ensure the files table is not shared. */
+ retval = unshare_files();
+ if (retval)
+ goto out;
+
+ /*
* Must be called _before_ exec_mmap() as bprm->mm is
* not visibile until then. This also enables the update
* to be lockless.
@@ -1779,21 +1789,11 @@ static int bprm_execve(struct linux_binprm *bprm,
int fd, struct filename *filename, int flags)
{
struct file *file;
- struct files_struct *displaced;
int retval;
- /*
- * Cancel any io_uring activity across execve
- */
- io_uring_task_cancel();
-
- retval = unshare_files(&displaced);
- if (retval)
- return retval;
-
retval = prepare_bprm_creds(bprm);
if (retval)
- goto out_files;
+ return retval;
check_unsafe_exec(bprm);
current->in_execve = 1;
@@ -1808,11 +1808,14 @@ static int bprm_execve(struct linux_binprm *bprm,
bprm->file = file;
/*
* Record that a name derived from an O_CLOEXEC fd will be
- * inaccessible after exec. Relies on having exclusive access to
- * current->files (due to unshare_files above).
+ * inaccessible after exec. This allows the code in exec to
+ * choose to fail when the executable is not mmaped into the
+ * interpreter and an open file descriptor is not passed to
+ * the interpreter. This makes for a better user experience
+ * than having the interpreter start and then immediately fail
+ * when it finds the executable is inaccessible.
*/
- if (bprm->fdpath &&
- close_on_exec(fd, rcu_dereference_raw(current->files->fdt)))
+ if (bprm->fdpath && get_close_on_exec(fd))
bprm->interp_flags |= BINPRM_FLAGS_PATH_INACCESSIBLE;
/* Set the unchanging part of bprm->cred */
@@ -1830,8 +1833,6 @@ static int bprm_execve(struct linux_binprm *bprm,
rseq_execve(current);
acct_update_integrals(current);
task_numa_free(current, false);
- if (displaced)
- put_files_struct(displaced);
return retval;
out:
@@ -1848,10 +1849,6 @@ out_unmark:
current->fs->in_exec = 0;
current->in_execve = 0;
-out_files:
- if (displaced)
- reset_files_struct(displaced);
-
return retval;
}

fs/file.c

View file
diff --git a/fs/file.c b/fs/file.c
index e08e4da..8434e0a 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -158,7 +158,7 @@ static int expand_fdtable(struct files_struct *files, unsigned int nr)
spin_unlock(&files->file_lock);
new_fdt = alloc_fdtable(nr);
- /* make sure all __fd_install() have seen resize_in_progress
+ /* make sure all fd_install() have seen resize_in_progress
* or have finished their rcu_read_lock_sched() section.
*/
if (atomic_read(&files->count) > 1)
@@ -181,7 +181,7 @@ static int expand_fdtable(struct files_struct *files, unsigned int nr)
rcu_assign_pointer(files->fdt, new_fdt);
if (cur_fdt != &files->fdtab)
call_rcu(&cur_fdt->rcu, free_fdtable_rcu);
- /* coupled with smp_rmb() in __fd_install() */
+ /* coupled with smp_rmb() in fd_install() */
smp_wmb();
return 1;
}
@@ -411,19 +411,6 @@ static struct fdtable *close_files(struct files_struct * files)
return fdt;
}
-struct files_struct *get_files_struct(struct task_struct *task)
-{
- struct files_struct *files;
-
- task_lock(task);
- files = task->files;
- if (files)
- atomic_inc(&files->count);
- task_unlock(task);
-
- return files;
-}
-
void put_files_struct(struct files_struct *files)
{
if (atomic_dec_and_test(&files->count)) {
@@ -436,18 +423,6 @@ void put_files_struct(struct files_struct *files)
}
}
-void reset_files_struct(struct files_struct *files)
-{
- struct task_struct *tsk = current;
- struct files_struct *old;
-
- old = tsk->files;
- task_lock(tsk);
- tsk->files = files;
- task_unlock(tsk);
- put_files_struct(old);
-}
-
void exit_files(struct task_struct *tsk)
{
struct files_struct * files = tsk->files;
@@ -492,9 +467,9 @@ static unsigned int find_next_fd(struct fdtable *fdt, unsigned int start)
/*
* allocate a file descriptor, mark it busy.
*/
-int __alloc_fd(struct files_struct *files,
- unsigned start, unsigned end, unsigned flags)
+static int alloc_fd(unsigned start, unsigned end, unsigned flags)
{
+ struct files_struct *files = current->files;
unsigned int fd;
int error;
struct fdtable *fdt;
@@ -550,14 +525,9 @@ out:
return error;
}
-static int alloc_fd(unsigned start, unsigned flags)
-{
- return __alloc_fd(current->files, start, rlimit(RLIMIT_NOFILE), flags);
-}
-
int __get_unused_fd_flags(unsigned flags, unsigned long nofile)
{
- return __alloc_fd(current->files, 0, nofile, flags);
+ return alloc_fd(0, nofile, flags);
}
int get_unused_fd_flags(unsigned flags)
@@ -596,17 +566,13 @@ EXPORT_SYMBOL(put_unused_fd);
* It should never happen - if we allow dup2() do it, _really_ bad things
* will follow.
*
- * NOTE: __fd_install() variant is really, really low-level; don't
- * use it unless you are forced to by truly lousy API shoved down
- * your throat. 'files' *MUST* be either current->files or obtained
- * by get_files_struct(current) done by whoever had given it to you,
- * or really bad things will happen. Normally you want to use
- * fd_install() instead.
+ * This consumes the "file" refcount, so callers should treat it
+ * as if they had called fput(file).
*/
-void __fd_install(struct files_struct *files, unsigned int fd,
- struct file *file)
+void fd_install(unsigned int fd, struct file *file)
{
+ struct files_struct *files = current->files;
struct fdtable *fdt;
rcu_read_lock_sched();
@@ -628,15 +594,6 @@ void __fd_install(struct files_struct *files, unsigned int fd,
rcu_read_unlock_sched();
}
-/*
- * This consumes the "file" refcount, so callers should treat it
- * as if they had called fput(file).
- */
-void fd_install(unsigned int fd, struct file *file)
-{
- __fd_install(current->files, fd, file);
-}
-
EXPORT_SYMBOL(fd_install);
static struct file *pick_file(struct files_struct *files, unsigned fd)
@@ -659,11 +616,9 @@ out_unlock:
return file;
}
-/*
- * The same warnings as for __alloc_fd()/__fd_install() apply here...
- */
-int __close_fd(struct files_struct *files, unsigned fd)
+int close_fd(unsigned fd)
{
+ struct files_struct *files = current->files;
struct file *file;
file = pick_file(files, fd);
@@ -672,7 +627,7 @@ int __close_fd(struct files_struct *files, unsigned fd)
return filp_close(file, files);
}
-EXPORT_SYMBOL(__close_fd); /* for ksys_close() */
+EXPORT_SYMBOL(close_fd); /* for ksys_close() */
static inline void __range_cloexec(struct files_struct *cur_fds,
unsigned int fd, unsigned int max_fd)
@@ -777,11 +732,11 @@ int __close_range(unsigned fd, unsigned max_fd, unsigned int flags)
}
/*
- * variant of __close_fd that gets a ref on the file for later fput.
+ * variant of close_fd that gets a ref on the file for later fput.
* The caller must ensure that filp_close() called on the file, and then
* an fput().
*/
-int __close_fd_get_file(unsigned int fd, struct file **res)
+int close_fd_get_file(unsigned int fd, struct file **res)
{
struct files_struct *files = current->files;
struct file *file;
@@ -850,7 +805,7 @@ static struct file *__fget_files(struct files_struct *files, unsigned int fd,
rcu_read_lock();
loop:
- file = fcheck_files(files, fd);
+ file = files_lookup_fd_rcu(files, fd);
if (file) {
/* File object ref couldn't be taken.
* dup2() atomicity guarantee is the reason
@@ -901,6 +856,42 @@ struct file *fget_task(struct task_struct *task, unsigned int fd)
return file;
}
+struct file *task_lookup_fd_rcu(struct task_struct *task, unsigned int fd)
+{
+ /* Must be called with rcu_read_lock held */
+ struct files_struct *files;
+ struct file *file = NULL;
+
+ task_lock(task);
+ files = task->files;
+ if (files)
+ file = files_lookup_fd_rcu(files, fd);
+ task_unlock(task);
+
+ return file;
+}
+
+struct file *task_lookup_next_fd_rcu(struct task_struct *task, unsigned int *ret_fd)
+{
+ /* Must be called with rcu_read_lock held */
+ struct files_struct *files;
+ unsigned int fd = *ret_fd;
+ struct file *file = NULL;
+
+ task_lock(task);
+ files = task->files;
+ if (files) {
+ for (; fd < files_fdtable(files)->max_fds; fd++) {
+ file = files_lookup_fd_rcu(files, fd);
+ if (file)
+ break;
+ }
+ }
+ task_unlock(task);
+ *ret_fd = fd;
+ return file;
+}
+
/*
* Lightweight file lookup - no refcnt increment if fd table isn't shared.
*
@@ -923,7 +914,7 @@ static unsigned long __fget_light(unsigned int fd, fmode_t mask)
struct file *file;
if (atomic_read(&files->count) == 1) {
- file = __fcheck_files(files, fd);
+ file = files_lookup_fd_raw(files, fd);
if (!file || unlikely(file->f_mode & mask))
return 0;
return (unsigned long)file;
@@ -1045,7 +1036,7 @@ int replace_fd(unsigned fd, struct file *file, unsigned flags)
struct files_struct *files = current->files;
if (!file)
- return __close_fd(files, fd);
+ return close_fd(fd);
if (fd >= rlimit(RLIMIT_NOFILE))
return -EBADF;
@@ -1134,7 +1125,7 @@ static int ksys_dup3(unsigned int oldfd, unsigned int newfd, int flags)
spin_lock(&files->file_lock);
err = expand_files(files, newfd);
- file = fcheck(oldfd);
+ file = files_lookup_fd_locked(files, oldfd);
if (unlikely(!file))
goto Ebadf;
if (unlikely(err < 0)) {
@@ -1163,7 +1154,7 @@ SYSCALL_DEFINE2(dup2, unsigned int, oldfd, unsigned int, newfd)
int retval = oldfd;
rcu_read_lock();
- if (!fcheck_files(files, oldfd))
+ if (!files_lookup_fd_rcu(files, oldfd))
retval = -EBADF;
rcu_read_unlock();
return retval;
@@ -1188,10 +1179,11 @@ SYSCALL_DEFINE1(dup, unsigned int, fildes)
int f_dupfd(unsigned int from, struct file *file, unsigned flags)
{
+ unsigned long nofile = rlimit(RLIMIT_NOFILE);
int err;
- if (from >= rlimit(RLIMIT_NOFILE))
+ if (from >= nofile)
return -EINVAL;
- err = alloc_fd(from, flags);
+ err = alloc_fd(from, nofile, flags);
if (err >= 0) {
get_file(file);
fd_install(err, file);

fs/io_uring.c

View file
diff --git a/fs/io_uring.c b/fs/io_uring.c
index b3544ec..2b588bd 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4236,7 +4236,7 @@ static int io_close(struct io_kiocb *req, bool force_nonblock,
/* might be already done during nonblock submission */
if (!close->put_file) {
- ret = __close_fd_get_file(close->fd, &close->put_file);
+ ret = close_fd_get_file(close->fd, &close->put_file);
if (ret < 0)
return (ret == -ENOENT) ? -EBADF : ret;
}

fs/locks.c

View file
diff --git a/fs/locks.c b/fs/locks.c
index ed95cd8..99ca97e 100644
--- a/fs/locks.c
+++ b/fs/locks.c
@@ -2539,14 +2539,15 @@ int fcntl_setlk(unsigned int fd, struct file *filp, unsigned int cmd,
*/
if (!error && file_lock->fl_type != F_UNLCK &&
!(file_lock->fl_flags & FL_OFDLCK)) {
+ struct files_struct *files = current->files;
/*
* We need that spin_lock here - it prevents reordering between
* update of i_flctx->flc_posix and check for it done in
* close(). rcu_read_lock() wouldn't do.
*/
- spin_lock(&current->files->file_lock);
- f = fcheck(fd);
- spin_unlock(&current->files->file_lock);
+ spin_lock(&files->file_lock);
+ f = files_lookup_fd_locked(files, fd);
+ spin_unlock(&files->file_lock);
if (f != filp) {
file_lock->fl_type = F_UNLCK;
error = do_lock_file_wait(filp, cmd, file_lock);
@@ -2670,14 +2671,15 @@ int fcntl_setlk64(unsigned int fd, struct file *filp, unsigned int cmd,
*/
if (!error && file_lock->fl_type != F_UNLCK &&
!(file_lock->fl_flags & FL_OFDLCK)) {
+ struct files_struct *files = current->files;
/*
* We need that spin_lock here - it prevents reordering between
* update of i_flctx->flc_posix and check for it done in
* close(). rcu_read_lock() wouldn't do.
*/
- spin_lock(&current->files->file_lock);
- f = fcheck(fd);
- spin_unlock(&current->files->file_lock);
+ spin_lock(&files->file_lock);
+ f = files_lookup_fd_locked(files, fd);
+ spin_unlock(&files->file_lock);
if (f != filp) {
file_lock->fl_type = F_UNLCK;
error = do_lock_file_wait(filp, cmd, file_lock);

fs/notify/dnotify/dnotify.c

View file
diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c
index 5dcda8f..5486aac 100644
--- a/fs/notify/dnotify/dnotify.c
+++ b/fs/notify/dnotify/dnotify.c
@@ -327,7 +327,7 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg)
}
rcu_read_lock();
- f = fcheck(fd);
+ f = lookup_fd_rcu(fd);
rcu_read_unlock();
/* if (f != filp) means that we lost a race and another task/thread

fs/open.c

View file
diff --git a/fs/open.c b/fs/open.c
index 4d7537a..1e06e44 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -1296,7 +1296,7 @@ EXPORT_SYMBOL(filp_close);
*/
SYSCALL_DEFINE1(close, unsigned int, fd)
{
- int retval = __close_fd(current->files, fd);
+ int retval = close_fd(fd);
/* can't restart close syscall because file table entry was cleared */
if (unlikely(retval == -ERESTARTSYS ||

fs/proc/fd.c

View file
diff --git a/fs/proc/fd.c b/fs/proc/fd.c
index 81882a1..cb51763 100644
--- a/fs/proc/fd.c
+++ b/fs/proc/fd.c
@@ -28,14 +28,13 @@ static int seq_show(struct seq_file *m, void *v)
if (!task)
return -ENOENT;
- files = get_files_struct(task);
- put_task_struct(task);
-
+ task_lock(task);
+ files = task->files;
if (files) {
unsigned int fd = proc_fd(m->private);
spin_lock(&files->file_lock);
- file = fcheck_files(files, fd);
+ file = files_lookup_fd_locked(files, fd);
if (file) {
struct fdtable *fdt = files_fdtable(files);
@@ -47,8 +46,9 @@ static int seq_show(struct seq_file *m, void *v)
ret = 0;
}
spin_unlock(&files->file_lock);
- put_files_struct(files);
}
+ task_unlock(task);
+ put_task_struct(task);
if (ret)
return ret;

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include/linux/fdtable.h

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include/linux/syscalls.h

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kernel/bpf/syscall.c

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kernel/bpf/task_iter.c

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kernel/fork.c

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kernel/kcmp.c

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