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| author | Benjamin Randazzo <benjamin@randazzo.fr> | 2015-07-25 16:36:50 +0200 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2015-10-13 03:46:11 +0100 |
| commit | 06f0f9d843af52573c7dad0d81ee9df984e0b6be (patch) | |
| tree | 08c844bca6f240fbe54b9a9b7be9315e49c475df | |
| parent | cbea57119272755ccfd710fdaf4669ae05512b02 (diff) | |
| download | kernel_samsung_smdk4412-06f0f9d843af52573c7dad0d81ee9df984e0b6be.zip kernel_samsung_smdk4412-06f0f9d843af52573c7dad0d81ee9df984e0b6be.tar.gz kernel_samsung_smdk4412-06f0f9d843af52573c7dad0d81ee9df984e0b6be.tar.bz2 | |
md: use kzalloc() when bitmap is disabled
commit b6878d9e03043695dbf3fa1caa6dfc09db225b16 upstream.
In drivers/md/md.c get_bitmap_file() uses kmalloc() for creating a
mdu_bitmap_file_t called "file".
5769 file = kmalloc(sizeof(*file), GFP_NOIO);
5770 if (!file)
5771 return -ENOMEM;
This structure is copied to user space at the end of the function.
5786 if (err == 0 &&
5787 copy_to_user(arg, file, sizeof(*file)))
5788 err = -EFAULT
But if bitmap is disabled only the first byte of "file" is initialized
with zero, so it's possible to read some bytes (up to 4095) of kernel
space memory from user space. This is an information leak.
5775 /* bitmap disabled, zero the first byte and copy out */
5776 if (!mddev->bitmap_info.file)
5777 file->pathname[0] = '\0';
Signed-off-by: Benjamin Randazzo <benjamin@randazzo.fr>
Signed-off-by: NeilBrown <neilb@suse.com>
[bwh: Backported to 3.2: patch both possible allocation calls]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | drivers/md/md.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/md/md.c b/drivers/md/md.c index ea8a181..d7e9242 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -5384,9 +5384,9 @@ static int get_bitmap_file(struct mddev * mddev, void __user * arg) int err = -ENOMEM; if (md_allow_write(mddev)) - file = kmalloc(sizeof(*file), GFP_NOIO); + file = kzalloc(sizeof(*file), GFP_NOIO); else - file = kmalloc(sizeof(*file), GFP_KERNEL); + file = kzalloc(sizeof(*file), GFP_KERNEL); if (!file) goto out; |