Re: [LTP] [PATCH V4] readlink03: fix return value for the syscall readlink()

[Caspar Zhang <czhang@redhat.com>]

On 03/15/2012 12:32 PM, Wanlong Gao wrote:
> Since commit http://git.kernel.org/linus/65cfc672
> which added O_PATH support to the *at() calls,
> the error return for readlink/readlinkat
> for the empty pathname has switched from
> ENOENT to EINVAL. And this patch merged to linux v2.6.39,
> So LTP commit https://github.com/linux-test-project/ltp/commit/0cc7514
> fix this with the kernel version v2.6.39 compared.
> 
> But recently, commit http://git.kernel.org/linus/1fa1e7f6
> which ensure we return ENOENT for the empty pathname
> for normal lookups.
> 
> Now, the patch whitch switch the return value back again
> is already queued for 3.0 and 3.1 stable release.
> 
> So, if the return value is EINVAL for empty pathname,
> it may be a kernel bug, so we needn't to check the kernel
> version but return the "kernel bug" warning  to LTP the users.
> 
> Signed-off-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
> Acked-by: Jan Stancek <jstancek@redhat.com>

Acked-by: Caspar Zhang <caspar@casparzhang.com>

> ---
>  testcases/kernel/syscalls/readlink/readlink03.c |    9 ++++-----
>  1 file changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/testcases/kernel/syscalls/readlink/readlink03.c b/testcases/kernel/syscalls/readlink/readlink03.c
> index 370bf7d..5ae8513 100644
> --- a/testcases/kernel/syscalls/readlink/readlink03.c
> +++ b/testcases/kernel/syscalls/readlink/readlink03.c
> @@ -173,11 +173,6 @@ int main(int ac, char **av)
>  				buf_size = sizeof(buffer);
>  			}
>  
> -			if (strncmp(test_desc, "Symlink Pathname is empty", 25) == 0) {
> -				if ((tst_kvercmp(2, 6, 39)) >= 0)
> -					Test_cases[i].exp_errno = EINVAL;
> -			}
> -
>  			/*
>  			 * Call readlink(2) to test different test conditions.
>  			 * verify that it fails with -1 return value and sets
> @@ -204,6 +199,10 @@ int main(int ac, char **av)
>  					 "errno=%d, expected errno=%d",
>  					 test_desc, TEST_ERRNO,
>  					 Test_cases[i].exp_errno);
> +				if ((strncmp(test_desc, "Symlink Pathname is empty", 25) == 0) &&
> +				     TEST_ERRNO == EINVAL)
> +					tst_resm(TWARN, "It may be a Kernel Bug, see the patch:"
> +						 "http://git.kernel.org/linus/1fa1e7f6");
>  			}
>  		}
>  	}


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