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authorHATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>2013-10-16 13:47:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-10-16 21:35:53 -0700
commit2cbe3b0af82279f14cfb3195f2406651f28ee9b8 (patch)
tree98888ef9e9799eb9e174f45c008df43bc033960a /fs
parente3b6c655b91e01a1dade056cfa358581b47a5351 (diff)
downloadlinux-2cbe3b0af82279f14cfb3195f2406651f28ee9b8.tar.gz
procfs: fix unintended truncation of returned mapped address
Currently, proc_reg_get_unmapped_area truncates upper 32-bit of the mapped virtual address returned from get_unmapped_area method in pde->proc_fops due to the variable rv of signed integer on x86_64. This is too small to have vitual address of unsigned long on x86_64 since on x86_64, signed integer is of 4 bytes while unsigned long is of 8 bytes. To fix this issue, use unsigned long instead. Fixes a regression added in commit c4fe24485729 ("sparc: fix PCI device proc file mmap(2)"). Signed-off-by: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: David S. Miller <davem@davemloft.net> Tested-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
-rw-r--r--fs/proc/inode.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 9f8ef9b7674..6c501c4d996 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -288,7 +288,7 @@ static int proc_reg_mmap(struct file *file, struct vm_area_struct *vma)
static unsigned long proc_reg_get_unmapped_area(struct file *file, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
{
struct proc_dir_entry *pde = PDE(file_inode(file));
- int rv = -EIO;
+ unsigned long rv = -EIO;
unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
if (use_pde(pde)) {
get_unmapped_area = pde->proc_fops->get_unmapped_area;