5.15-stable patches

added patches:
	fs-clear-or-set-fmode_lseek-based-on-llseek-function.patch

diff --git a/queue-5.15/fs-clear-or-set-fmode_lseek-based-on-llseek-function.patch b/queue-5.15/fs-clear-or-set-fmode_lseek-based-on-llseek-function.patch
new file mode 100644 (file)
index 0000000..0cc98fa
--- /dev/null
+++ b/queue-5.15/fs-clear-or-set-fmode_lseek-based-on-llseek-function.patch
@@ -0,0 +1,51 @@
+From e7478158e1378325907edfdd960eca98a1be405b Mon Sep 17 00:00:00 2001
+From: "Jason A. Donenfeld" <Jason@zx2c4.com>
+Date: Wed, 29 Jun 2022 15:06:57 +0200
+Subject: fs: clear or set FMODE_LSEEK based on llseek function
+
+From: Jason A. Donenfeld <Jason@zx2c4.com>
+
+commit e7478158e1378325907edfdd960eca98a1be405b upstream.
+
+Pipe-like behaviour on llseek(2) (i.e. unconditionally failing with
+-ESPIPE) can be expresses in 3 ways:
+       1) ->llseek set to NULL in file_operations
+       2) ->llseek set to no_llseek in file_operations
+       3) FMODE_LSEEK *not* set in ->f_mode.
+
+Enforce (3) in cases (1) and (2); that will allow to simplify the
+checks and eventually get rid of no_llseek boilerplate.
+
+Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
+Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Signed-off-by: Saeed Mirzamohammadi <saeed.mirzamohammadi@oracle.com>
+---
+ fs/file_table.c |    2 ++
+ fs/open.c       |    4 ++++
+ 2 files changed, 6 insertions(+)
+
+--- a/fs/file_table.c
++++ b/fs/file_table.c
+@@ -198,6 +198,8 @@ static struct file *alloc_file(const str
+       file->f_mapping = path->dentry->d_inode->i_mapping;
+       file->f_wb_err = filemap_sample_wb_err(file->f_mapping);
+       file->f_sb_err = file_sample_sb_err(file);
++      if (fop->llseek && fop->llseek != no_llseek)
++              file->f_mode |= FMODE_LSEEK;
+       if ((file->f_mode & FMODE_READ) &&
+            likely(fop->read || fop->read_iter))
+               file->f_mode |= FMODE_CAN_READ;
+--- a/fs/open.c
++++ b/fs/open.c
+@@ -834,6 +834,10 @@ static int do_dentry_open(struct file *f
+       if ((f->f_mode & FMODE_WRITE) &&
+            likely(f->f_op->write || f->f_op->write_iter))
+               f->f_mode |= FMODE_CAN_WRITE;
++      if ((f->f_mode & FMODE_LSEEK) && !f->f_op->llseek)
++              f->f_mode &= ~FMODE_LSEEK;
++      if ((f->f_mode & FMODE_LSEEK) && f->f_op->llseek == no_llseek)
++              f->f_mode &= ~FMODE_LSEEK;
+ 
+       f->f_write_hint = WRITE_LIFE_NOT_SET;
+       f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);

diff --git a/queue-5.15/series b/queue-5.15/series
index ba23b38c4ee021b34ba0132db21f9b96e8bd4934..82bc8b10c8a60dce7e6140b48524b704547dab96 100644 (file)
--- a/queue-5.15/series
+++ b/queue-5.15/series
@@ -29,3 +29,4 @@ media-mceusb-set-timeout-to-at-least-timeout-provided.patch
 media-venus-dec-handle-the-case-where-find_format-fails.patch
 x86-topology-fix-multiple-packages-shown-on-a-single-package-system.patch
 x86-topology-fix-duplicated-core-id-within-a-package.patch
+fs-clear-or-set-fmode_lseek-based-on-llseek-function.patch