Messages in this thread Patch in this message | | | Date | Fri, 6 Dec 2013 10:57:38 -0800 | From | Kees Cook <> | Subject | [PATCH] test: fix sparse warnings in user_copy tests |
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Sparse fix for "test: check copy_to/from_user boundary validation":
To keep sparse happy with the horrible things being done with the user memory pointers, declare both __user and non-__user cases ahead of time to avoid needing to do the casts later.
Signed-off-by: Kees Cook <keescook@chromium.org> --- lib/test_user_copy.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/lib/test_user_copy.c b/lib/test_user_copy.c index b61f3e406e0b..0ecef3e4690e 100644 --- a/lib/test_user_copy.c +++ b/lib/test_user_copy.c @@ -38,6 +38,7 @@ static int __init test_user_copy_init(void) int ret = 0; char *kmem; char __user *usermem; + char *bad_usermem; unsigned long user_addr; unsigned long value = 0x5A; @@ -55,6 +56,7 @@ static int __init test_user_copy_init(void) } usermem = (char __user *)user_addr; + bad_usermem = (char *)user_addr; /* Legitimate usage: none of these should fail. */ ret |= test(copy_from_user(kmem, usermem, PAGE_SIZE), @@ -70,13 +72,13 @@ static int __init test_user_copy_init(void) ret |= test(!copy_from_user(kmem, (char __user *)(kmem + PAGE_SIZE), PAGE_SIZE), "illegal all-kernel copy_from_user passed"); - ret |= test(!copy_from_user((char *)usermem, (char __user *)kmem, + ret |= test(!copy_from_user(bad_usermem, (char __user *)kmem, PAGE_SIZE), "illegal reversed copy_from_user passed"); ret |= test(!copy_to_user((char __user *)kmem, kmem + PAGE_SIZE, PAGE_SIZE), "illegal all-kernel copy_to_user passed"); - ret |= test(!copy_to_user((char __user *)kmem, (char *)usermem, + ret |= test(!copy_to_user((char __user *)kmem, bad_usermem, PAGE_SIZE), "illegal reversed copy_to_user passed"); ret |= test(!get_user(value, (unsigned long __user *)kmem), -- 1.7.9.5
-- Kees Cook Chrome OS Security
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