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| author | Djalal Harouni <tixxdz@opendz.org> | 2012-07-30 14:42:28 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-30 17:25:20 -0700 |
| commit | bc452b4b65bd589083a7a7ba4f14f85dfc8454fa (patch) | |
| tree | 43e2d8031fea729f32f7800936d61fbc59fc7cdd | |
| parent | e8905ec27e2f4ea1b9f7e03df68a060b3ae6fca8 (diff) | |
| download | linux-bc452b4b65bd589083a7a7ba4f14f85dfc8454fa.tar.gz linux-bc452b4b65bd589083a7a7ba4f14f85dfc8454fa.tar.bz2 linux-bc452b4b65bd589083a7a7ba4f14f85dfc8454fa.zip | |
proc: do not allow negative offsets on /proc/<pid>/environ
__mem_open() which is called by both /proc/<pid>/environ and
/proc/<pid>/mem ->open() handlers will allow the use of negative offsets.
/proc/<pid>/mem has negative offsets but not /proc/<pid>/environ.
Clean this by moving the 'force FMODE_UNSIGNED_OFFSET flag' to mem_open()
to allow negative offsets only on /proc/<pid>/mem.
Signed-off-by: Djalal Harouni <tixxdz@opendz.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Brad Spengler <spender@grsecurity.net>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/proc/base.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index 39ee093b5e96..1b6c84cbdb73 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -695,8 +695,6 @@ static int __mem_open(struct inode *inode, struct file *file, unsigned int mode) mmput(mm); } - /* OK to pass negative loff_t, we can catch out-of-range */ - file->f_mode |= FMODE_UNSIGNED_OFFSET; file->private_data = mm; return 0; @@ -704,7 +702,12 @@ static int __mem_open(struct inode *inode, struct file *file, unsigned int mode) static int mem_open(struct inode *inode, struct file *file) { - return __mem_open(inode, file, PTRACE_MODE_ATTACH); + int ret = __mem_open(inode, file, PTRACE_MODE_ATTACH); + + /* OK to pass negative loff_t, we can catch out-of-range */ + file->f_mode |= FMODE_UNSIGNED_OFFSET; + + return ret; } static ssize_t mem_rw(struct file *file, char __user *buf, |