574cf7b59f
It can happen if the file descriptor was opened before lowering the limit. Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
137 lines
4.4 KiB
Text
137 lines
4.4 KiB
Text
/* BEGIN_HEADER */
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#include "mbedtls/net_sockets.h"
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#if defined(unix) || defined(__unix__) || defined(__unix) || \
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defined(__APPLE__) || defined(__QNXNTO__) || \
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defined(__HAIKU__) || defined(__midipix__)
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#define MBEDTLS_PLATFORM_IS_UNIXLIKE
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#endif
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#if defined(MBEDTLS_PLATFORM_IS_UNIXLIKE)
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#include <sys/fcntl.h>
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#include <sys/resource.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#endif
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#if defined(MBEDTLS_PLATFORM_IS_UNIXLIKE)
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/** Open a file on the given file descriptor.
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*
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* This is disruptive if there is already something open on that descriptor.
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* Caller beware.
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*
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* \param ctx An initialized, but unopened socket context.
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* On success, it refers to the opened file (\p wanted_fd).
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* \param wanted_fd The desired file descriptor.
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*
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* \return \c 0 on succes, a negative error code on error.
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*/
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static int open_file_on_fd( mbedtls_net_context *ctx, int wanted_fd )
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{
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int got_fd = open( "/dev/null", O_RDONLY );
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TEST_ASSERT( got_fd >= 0 );
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if( got_fd != wanted_fd )
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{
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TEST_ASSERT( dup2( got_fd, wanted_fd ) >= 0 );
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TEST_ASSERT( close( got_fd ) >= 0 );
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}
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ctx->fd = wanted_fd;
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return( 0 );
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exit:
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return( -1 );
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}
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#endif /* MBEDTLS_PLATFORM_IS_UNIXLIKE */
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/* END_HEADER */
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/* BEGIN_DEPENDENCIES
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* depends_on:MBEDTLS_NET_C
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* END_DEPENDENCIES
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*/
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/* BEGIN_CASE */
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void context_init_free( int reinit )
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{
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mbedtls_net_context ctx;
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mbedtls_net_init( &ctx );
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mbedtls_net_free( &ctx );
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if( reinit )
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mbedtls_net_init( &ctx );
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mbedtls_net_free( &ctx );
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/* This test case always succeeds, functionally speaking. A plausible
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* bug might trigger an invalid pointer dereference or a memory leak. */
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goto exit;
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}
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/* END_CASE */
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/* BEGIN_CASE depends_on:MBEDTLS_PLATFORM_IS_UNIXLIKE */
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void poll_beyond_fd_setsize( )
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{
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/* Test that mbedtls_net_poll does not misbehave when given a file
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* descriptor greater or equal to FD_SETSIZE. This code is specific to
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* platforms with a Unix-like select() function, which is where
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* FD_SETSIZE is a concern. */
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struct rlimit rlim_nofile;
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int restore_rlim_nofile = 0;
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int ret;
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mbedtls_net_context ctx;
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uint8_t buf[1];
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mbedtls_net_init( &ctx );
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/* On many systems, by default, the maximum permitted file descriptor
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* number is less than FD_SETSIZE. If so, raise the limit if
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* possible.
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*
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* If the limit can't be raised, a file descriptor opened by the
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* net_sockets module will be less than FD_SETSIZE, so the test
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* is not necessary and we mark it as skipped.
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* A file descriptor could still be higher than FD_SETSIZE if it was
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* opened before the limit was lowered (which is something an application
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* might do); but we don't do such things in our test code, so the unit
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* test will run if it can.
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*/
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TEST_ASSERT( getrlimit( RLIMIT_NOFILE, &rlim_nofile ) == 0 );
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if( rlim_nofile.rlim_cur < FD_SETSIZE + 1 )
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{
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rlim_t old_rlim_cur = rlim_nofile.rlim_cur;
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rlim_nofile.rlim_cur = FD_SETSIZE + 1;
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TEST_ASSUME( setrlimit( RLIMIT_NOFILE, &rlim_nofile ) == 0 );
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rlim_nofile.rlim_cur = old_rlim_cur;
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restore_rlim_nofile = 1;
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}
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TEST_ASSERT( open_file_on_fd( &ctx, FD_SETSIZE ) == 0 );
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/* In principle, mbedtls_net_poll() with valid arguments should succeed.
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* However, we know that on Unix-like platforms (and others), this function
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* is implemented on top of select() and fd_set, which do not support
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* file descriptors greater or equal to FD_SETSIZE. So we expect to hit
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* this platform limitation.
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*
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* If mbedtls_net_poll() does not proprely check that ctx.fd is in range,
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* it may still happen to return the expected failure code, but if this
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* is problematic on the particular platform where the code is running,
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* a memory sanitizer such as UBSan should catch it.
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*/
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ret = mbedtls_net_poll( &ctx, MBEDTLS_NET_POLL_READ, 0 );
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TEST_EQUAL( ret, MBEDTLS_ERR_NET_POLL_FAILED );
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/* mbedtls_net_recv_timeout() uses select() and fd_set in the same way. */
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ret = mbedtls_net_recv_timeout( &ctx, buf, sizeof( buf ), 0 );
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TEST_EQUAL( ret, MBEDTLS_ERR_NET_POLL_FAILED );
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exit:
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mbedtls_net_free( &ctx );
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if( restore_rlim_nofile )
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setrlimit( RLIMIT_NOFILE, &rlim_nofile );
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}
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/* END_CASE */
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