generic: 5.15: add pending patch fixing binfmt compilation warning

Add pending patch fixing binfmt compilation warning on some arch.
This fix compilation warning:
fs/binfmt_elf.c: In function 'parse_elf_properties.isra':
fs/binfmt_elf.c:821:1: error: the frame size of 1040 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
  821 | }
      | ^
cc1: all warnings being treated as errors

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

diff --git a/target/linux/generic/pending-5.15/130-binfmt_elf-dynamically-allocate-note.data-in-parse_e.patch b/target/linux/generic/pending-5.15/130-binfmt_elf-dynamically-allocate-note.data-in-parse_e.patch
new file mode 100644 (file)
index 0000000..f04007e
--- /dev/null
+++ b/target/linux/generic/pending-5.15/130-binfmt_elf-dynamically-allocate-note.data-in-parse_e.patch
@@ -0,0 +1,94 @@
+From ca71e00839fcdd26f122fb6d9e97903c9fe198f7 Mon Sep 17 00:00:00 2001
+From: Christian Marangi <ansuelsmth@gmail.com>
+Date: Sat, 6 May 2023 08:08:35 +0200
+Subject: [PATCH] binfmt_elf: dynamically allocate note.data in
+ parse_elf_properties
+
+Dynamically allocate note.data in parse_elf_properties to fix
+compilation warning on some arch.
+
+On some arch note.data exceet the stack limit for a single function and
+this cause the following compilation warning:
+fs/binfmt_elf.c: In function 'parse_elf_properties.isra':
+fs/binfmt_elf.c:821:1: error: the frame size of 1040 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
+  821 | }
+      | ^
+cc1: all warnings being treated as errors
+
+Fix this by dynamically allocating the array.
+
+Fixes: 00e19ceec80b ("ELF: Add ELF program property parsing support")
+Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
+Cc: stable@vger.kernel.org # v5.8+
+---
+ fs/binfmt_elf.c | 32 +++++++++++++++++++++++---------
+ 1 file changed, 23 insertions(+), 9 deletions(-)
+
+--- a/fs/binfmt_elf.c
++++ b/fs/binfmt_elf.c
+@@ -768,7 +768,7 @@ static int parse_elf_properties(struct f
+ {
+       union {
+               struct elf_note nhdr;
+-              char data[NOTE_DATA_SZ];
++              char *data;
+       } note;
+       loff_t pos;
+       ssize_t n;
+@@ -788,26 +788,38 @@ static int parse_elf_properties(struct f
+       if (phdr->p_filesz > sizeof(note))
+               return -ENOEXEC;
+ 
++      note.data = kcalloc(NOTE_DATA_SZ, sizeof(*note.data), GFP_KERNEL);
++      if (!note.data)
++              return -ENOMEM;
++
+       pos = phdr->p_offset;
+       n = kernel_read(f, &note, phdr->p_filesz, &pos);
+ 
+       BUILD_BUG_ON(sizeof(note) < sizeof(note.nhdr) + NOTE_NAME_SZ);
+-      if (n < 0 || n < sizeof(note.nhdr) + NOTE_NAME_SZ)
+-              return -EIO;
++      if (n < 0 || n < sizeof(note.nhdr) + NOTE_NAME_SZ) {
++              ret = -EIO;
++              goto exit;
++      }
+ 
+       if (note.nhdr.n_type != NT_GNU_PROPERTY_TYPE_0 ||
+           note.nhdr.n_namesz != NOTE_NAME_SZ ||
+           strncmp(note.data + sizeof(note.nhdr),
+-                  GNU_PROPERTY_TYPE_0_NAME, n - sizeof(note.nhdr)))
+-              return -ENOEXEC;
++                  GNU_PROPERTY_TYPE_0_NAME, n - sizeof(note.nhdr))) {
++              ret = -ENOEXEC;
++              goto exit;
++      }
+ 
+       off = round_up(sizeof(note.nhdr) + NOTE_NAME_SZ,
+                      ELF_GNU_PROPERTY_ALIGN);
+-      if (off > n)
+-              return -ENOEXEC;
+-
+-      if (note.nhdr.n_descsz > n - off)
+-              return -ENOEXEC;
++      if (off > n) {
++              ret = -ENOEXEC;
++              goto exit;
++      }
++
++      if (note.nhdr.n_descsz > n - off) {
++              ret = -ENOEXEC;
++              goto exit;
++      }
+       datasz = off + note.nhdr.n_descsz;
+ 
+       have_prev_type = false;
+@@ -817,6 +829,8 @@ static int parse_elf_properties(struct f
+               have_prev_type = true;
+       } while (!ret);
+ 
++exit:
++      kfree(note.data);
+       return ret == -ENOENT ? 0 : ret;
+ }
+