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5913ea1ba2
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>
95 lines
2.6 KiB
Diff
95 lines
2.6 KiB
Diff
From ca71e00839fcdd26f122fb6d9e97903c9fe198f7 Mon Sep 17 00:00:00 2001
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From: Christian Marangi <ansuelsmth@gmail.com>
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Date: Sat, 6 May 2023 08:08:35 +0200
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Subject: [PATCH] binfmt_elf: dynamically allocate note.data in
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parse_elf_properties
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Dynamically allocate note.data in parse_elf_properties to fix
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compilation warning on some arch.
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On some arch note.data exceet the stack limit for a single function and
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this cause the following compilation warning:
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fs/binfmt_elf.c: In function 'parse_elf_properties.isra':
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fs/binfmt_elf.c:821:1: error: the frame size of 1040 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
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821 | }
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| ^
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cc1: all warnings being treated as errors
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Fix this by dynamically allocating the array.
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Fixes: 00e19ceec80b ("ELF: Add ELF program property parsing support")
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Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
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Cc: stable@vger.kernel.org # v5.8+
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---
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fs/binfmt_elf.c | 32 +++++++++++++++++++++++---------
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1 file changed, 23 insertions(+), 9 deletions(-)
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--- a/fs/binfmt_elf.c
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+++ b/fs/binfmt_elf.c
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@@ -768,7 +768,7 @@ static int parse_elf_properties(struct f
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{
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union {
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struct elf_note nhdr;
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- char data[NOTE_DATA_SZ];
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+ char *data;
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} note;
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loff_t pos;
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ssize_t n;
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@@ -788,26 +788,38 @@ static int parse_elf_properties(struct f
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if (phdr->p_filesz > sizeof(note))
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return -ENOEXEC;
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+ note.data = kcalloc(NOTE_DATA_SZ, sizeof(*note.data), GFP_KERNEL);
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+ if (!note.data)
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+ return -ENOMEM;
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+
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pos = phdr->p_offset;
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n = kernel_read(f, ¬e, phdr->p_filesz, &pos);
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BUILD_BUG_ON(sizeof(note) < sizeof(note.nhdr) + NOTE_NAME_SZ);
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- if (n < 0 || n < sizeof(note.nhdr) + NOTE_NAME_SZ)
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- return -EIO;
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+ if (n < 0 || n < sizeof(note.nhdr) + NOTE_NAME_SZ) {
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+ ret = -EIO;
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+ goto exit;
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+ }
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if (note.nhdr.n_type != NT_GNU_PROPERTY_TYPE_0 ||
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note.nhdr.n_namesz != NOTE_NAME_SZ ||
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strncmp(note.data + sizeof(note.nhdr),
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- GNU_PROPERTY_TYPE_0_NAME, n - sizeof(note.nhdr)))
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- return -ENOEXEC;
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+ GNU_PROPERTY_TYPE_0_NAME, n - sizeof(note.nhdr))) {
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+ ret = -ENOEXEC;
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+ goto exit;
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+ }
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off = round_up(sizeof(note.nhdr) + NOTE_NAME_SZ,
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ELF_GNU_PROPERTY_ALIGN);
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- if (off > n)
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- return -ENOEXEC;
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-
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- if (note.nhdr.n_descsz > n - off)
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- return -ENOEXEC;
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+ if (off > n) {
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+ ret = -ENOEXEC;
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+ goto exit;
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+ }
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+
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+ if (note.nhdr.n_descsz > n - off) {
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+ ret = -ENOEXEC;
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+ goto exit;
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+ }
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datasz = off + note.nhdr.n_descsz;
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have_prev_type = false;
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@@ -817,6 +829,8 @@ static int parse_elf_properties(struct f
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have_prev_type = true;
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} while (!ret);
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+exit:
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+ kfree(note.data);
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return ret == -ENOENT ? 0 : ret;
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}
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