diff options
| author | Joe Perches | 2019-12-04 16:50:53 -0800 |
|---|---|---|
| committer | Linus Torvalds | 2019-12-04 19:44:12 -0800 |
| commit | 5e1aada08cd19ea652b2d32a250501d09b02ff2e (patch) | |
| tree | b0722199d6d1f1b432a237e47f02cbb150f89dfa /kernel/sys.c | |
| parent | ef70eff9dea66f38f8c2c2dcc7fe4b7a2bbb4921 (diff) | |
kernel/sys.c: avoid copying possible padding bytes in copy_to_user
Initialization is not guaranteed to zero padding bytes so use an
explicit memset instead to avoid leaking any kernel content in any
possible padding bytes.
Link: http://lkml.kernel.org/r/dfa331c00881d61c8ee51577a082d8bebd61805c.camel@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Dan Carpenter <error27@gmail.com>
Cc: Julia Lawall <julia.lawall@lip6.fr>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Kees Cook <keescook@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/sys.c')
| -rw-r--r-- | kernel/sys.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/kernel/sys.c b/kernel/sys.c index d3aef31e24dc..a9331f101883 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -1279,11 +1279,13 @@ SYSCALL_DEFINE1(uname, struct old_utsname __user *, name) SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name) { - struct oldold_utsname tmp = {}; + struct oldold_utsname tmp; if (!name) return -EFAULT; + memset(&tmp, 0, sizeof(tmp)); + down_read(&uts_sem); memcpy(&tmp.sysname, &utsname()->sysname, __OLD_UTS_LEN); memcpy(&tmp.nodename, &utsname()->nodename, __OLD_UTS_LEN); |