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Fix sloppiness around stricly less-than vs less or equal

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Fix sloppy wording around stricly less-than vs less or equal in
comments. Also fix an off-by-one error in a comparison which led to
calling setrlimit if the limit was exactly the minimum required for
the test, which was unnecessary but harmless.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2021-03-01 11:40:56 +01:00
parent c8dab5b41e
commit 97c57fe439
1 changed files with 10 additions and 9 deletions
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19
tests/suites/test_suite_net.function
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@ -75,8 +75,9 @@ void context_init_free( int reinit )
void poll_beyond_fd_setsize( )
{
/* Test that mbedtls_net_poll does not misbehave when given a file
* descriptor beyond FD_SETSIZE. This code is specific to platforms
* with a Unix-like select() function. */
* descriptor greater or equal to FD_SETSIZE. This code is specific to
* platforms with a Unix-like select() function, which is where
* FD_SETSIZE is a concern. */
struct rlimit rlim_nofile;
int restore_rlim_nofile = 0;
@ -87,15 +88,15 @@ void poll_beyond_fd_setsize( )
mbedtls_net_init( &ctx );
/* On many systems, by default, the maximum permitted file descriptor
* number is less or equal to FD_SETSIZE. If so, raise the limit if
* number is less than FD_SETSIZE. If so, raise the limit if
* possible.
*
* If the limit can't be raised, a newly open file descriptor
* won't be higher than FD_SETSIZE, so the test is not necessary and we
* mark it as skipped.
* If the limit can't be raised, a file descriptor opened by the
* net_sockets module will be less than FD_SETSIZE, so the test
* is not necessary and we mark it as skipped.
*/
TEST_ASSERT( getrlimit( RLIMIT_NOFILE, &rlim_nofile ) == 0 );
if( rlim_nofile.rlim_cur <= FD_SETSIZE + 1 )
if( rlim_nofile.rlim_cur < FD_SETSIZE + 1 )
{
rlim_t old_rlim_cur = rlim_nofile.rlim_cur;
rlim_nofile.rlim_cur = FD_SETSIZE + 1;
@ -109,8 +110,8 @@ void poll_beyond_fd_setsize( )
/* In principle, mbedtls_net_poll() with valid arguments should succeed.
* However, we know that on Unix-like platforms (and others), this function
* is implemented on top of select() and fd_set, which do not support
* file descriptors beyond FD_SETSIZE. So we expect to hit this platform
* limitation.
* file descriptors greater or equal to FD_SETSIZE. So we expect to hit
* this platform limitation.
*
* If mbedtls_net_poll() does not proprely check that ctx.fd is in range,
* it may still happen to return the expected failure code, but if this