On Thu, Oct 27, 2022 at 3:54 PM Alistair Francis
<alistair.fran...@opensource.wdc.com> wrote:
>
> From: Alistair Francis <alistair.fran...@wdc.com>
>
> Add support for the 64-bit time_t syscalls SYS_ppoll_time64
> and SYS_pselect6_time64.
>
> These are the syscalls that exist 32-bit platforms since the 5.1 kernel.
> 32-bit platforms with a 64-bit time_t only have these and don't have the
> original syscalls (such as 32-bit RISC-V).
>
> Fixes: https://github.com/lttng/lttng-tools/pull/162
> Signed-off-by: Alistair Francis <alistair.fran...@wdc.com>
Ping!
Alistair
> ---
> To keep the test_cases[] array clean I have implemented the functions
> for all builds, but the functions are a no-op if the syscall is missing.
>
> v2:
> - Split out a seperate _time64 test
>
> tests/regression/kernel/select_poll_epoll.cpp | 184 ++++++++++++++++++
> 1 file changed, 184 insertions(+)
>
> diff --git a/tests/regression/kernel/select_poll_epoll.cpp
> b/tests/regression/kernel/select_poll_epoll.cpp
> index c0b688217..dfaab52c8 100644
> --- a/tests/regression/kernel/select_poll_epoll.cpp
> +++ b/tests/regression/kernel/select_poll_epoll.cpp
> @@ -5,6 +5,7 @@
> *
> */
>
> +#include <errno.h>
> #include <fcntl.h>
> #include <limits.h>
> #include <poll.h>
> @@ -48,10 +49,14 @@ int lttng_opt_quiet, lttng_opt_verbose, lttng_opt_mi;
>
> static void run_working_cases(FILE *validation_output_file);
> static void pselect_invalid_fd(FILE *validation_output_file);
> +static void pselect_time64_invalid_fd(FILE *validation_output_file);
> static void test_ppoll_big(FILE *validation_output_file);
> static void ppoll_fds_buffer_overflow(FILE *validation_output_file);
> +static void ppoll_time64_fds_buffer_overflow(FILE *validation_output_file);
> static void pselect_invalid_pointer(FILE *validation_output_file);
> +static void pselect_time64_invalid_pointer(FILE *validation_output_file);
> static void ppoll_fds_ulong_max(FILE *validation_output_file);
> +static void ppoll_time64_fds_ulong_max(FILE *validation_output_file);
> static void epoll_pwait_invalid_pointer(FILE *validation_output_file);
> static void epoll_pwait_int_max(FILE *validation_output_file);
> static void ppoll_concurrent_write(FILE *validation_output_file);
> @@ -69,10 +74,14 @@ const struct test_case {
> { .run = run_working_cases, .produces_validation_info = true,
> .timeout = -1 },
> { .run = run_working_cases, .produces_validation_info = true,
> .timeout = 1 },
> { .run = pselect_invalid_fd, .produces_validation_info = false,
> .timeout = 0 },
> + { .run = pselect_time64_invalid_fd, .produces_validation_info =
> false, .timeout = 0 },
> { .run = test_ppoll_big, .produces_validation_info = false, .timeout
> = 0 },
> { .run = ppoll_fds_buffer_overflow, .produces_validation_info =
> false, .timeout = 0 },
> + { .run = ppoll_time64_fds_buffer_overflow, .produces_validation_info
> = false, .timeout = 0 },
> { .run = pselect_invalid_pointer, .produces_validation_info = false,
> .timeout = 0 },
> + { .run = pselect_time64_invalid_pointer, .produces_validation_info =
> false, .timeout = 0 },
> { .run = ppoll_fds_ulong_max, .produces_validation_info = false,
> .timeout = 0 },
> + { .run = ppoll_time64_fds_ulong_max, .produces_validation_info =
> false, .timeout = 0 },
> { .run = epoll_pwait_invalid_pointer, .produces_validation_info =
> true, .timeout = 0 },
> { .run = epoll_pwait_int_max, .produces_validation_info = true,
> .timeout = 0 },
> { .run = ppoll_concurrent_write, .produces_validation_info = false,
> .timeout = 0 },
> @@ -440,6 +449,44 @@ end:
> return;
> }
>
> +/*
> + * Ask for 100 FDs in a buffer for allocated for only 1 FD, should
> + * segfault (eventually with a "*** stack smashing detected ***" message).
> + * The event should contain an array of 100 FDs filled with garbage.
> + */
> +static
> +void ppoll_time64_fds_buffer_overflow(
> + FILE *validation_output_file __attribute__((unused)))
> +{
> +#ifdef SYS_ppoll_time64
> + struct pollfd ufds[NB_FD];
> + char buf[BUF_SIZE];
> + int ret;
> +
> + ufds[0].fd = wait_fd;
> + ufds[0].events = POLLIN|POLLPRI;
> +
> + /*
> + * As there is no timeout value, we don't convert to/from
> + * 64/32-bit time_t.
> + */
> + ret = syscall(SYS_ppoll_time64, ufds, 100, NULL, NULL);
> + /*
> + * There is no fallback to SYS_ppoll, we expect SYS_ppoll_time64
> + * to work and if it doesn't we fail.
> + */
> +
> + if (ret < 0) {
> + PERROR("ppoll_time64");
> + } else if (ret > 0) {
> + ret = read(wait_fd, buf, BUF_SIZE);
> + if (ret < 0) {
> + PERROR("[ppoll_time64] read");
> + }
> + }
> +#endif
> +}
> +
> /*
> * Ask for 100 FDs in a buffer for allocated for only 1 FD, should
> * segfault (eventually with a "*** stack smashing detected ***" message).
> @@ -449,6 +496,7 @@ static
> void ppoll_fds_buffer_overflow(
> FILE *validation_output_file __attribute__((unused)))
> {
> +#ifdef SYS_ppoll
> struct pollfd ufds[NB_FD];
> char buf[BUF_SIZE];
> int ret;
> @@ -466,6 +514,46 @@ void ppoll_fds_buffer_overflow(
> PERROR("[ppoll] read");
> }
> }
> +#endif
> +}
> +
> +/*
> + * Ask for ULONG_MAX FDs in a buffer for allocated for only 1 FD, should
> + * cleanly fail with a "Invalid argument".
> + * The event should contain an empty array of FDs and overflow = 1.
> + */
> +static
> +void ppoll_time64_fds_ulong_max(FILE *validation_output_file
> __attribute__((unused)))
> +{
> +#ifdef SYS_ppoll_time64
> + struct pollfd ufds[NB_FD];
> + char buf[BUF_SIZE];
> + int ret;
> +
> + ufds[0].fd = wait_fd;
> + ufds[0].events = POLLIN|POLLPRI;
> +
> + /*
> + * As there is no timeout value, we don't convert to/from
> + * 64/32-bit time_t.
> + */
> + ret = syscall(SYS_ppoll_time64, ufds, ULONG_MAX, NULL, NULL);
> + /*
> + * There is no fallback to SYS_ppoll, we expect SYS_ppoll_time64
> + * to work and if it doesn't we fail.
> + */
> +
> + if (ret < 0 && errno != ENOSYS) {
> + /* Expected error. */
> + } else if (errno == ENOSYS) {
> + PERROR("[ppoll_time64] missing syscall");
> + } else if (ret > 0) {
> + ret = read(wait_fd, buf, BUF_SIZE);
> + if (ret < 0) {
> + PERROR("[ppoll_time64] read");
> + }
> + }
> +#endif
> }
>
> /*
> @@ -476,6 +564,7 @@ void ppoll_fds_buffer_overflow(
> static
> void ppoll_fds_ulong_max(FILE *validation_output_file
> __attribute__((unused)))
> {
> +#ifdef SYS_ppoll
> struct pollfd ufds[NB_FD];
> char buf[BUF_SIZE];
> int ret;
> @@ -492,6 +581,59 @@ void ppoll_fds_ulong_max(FILE *validation_output_file
> __attribute__((unused)))
> PERROR("[ppoll] read");
> }
> }
> +#endif
> +}
> +
> +/*
> + * Pass an invalid file descriptor to pselect6(). The syscall should return
> + * -EBADF. The recorded event should contain a "ret = -EBADF (-9)".
> + */
> +static
> +void pselect_time64_invalid_fd(FILE *validation_output_file
> __attribute__((unused)))
> +{
> +#ifdef SYS_pselect6_time64
> + fd_set rfds;
> + int ret;
> + int fd;
> + char buf[BUF_SIZE];
> +
> + /*
> + * Open a file, close it and use the closed FD in the pselect6 call.
> + */
> + fd = open("/dev/null", O_RDONLY);
> + if (fd == -1) {
> + PERROR("open");
> + goto error;
> + }
> +
> + ret = close(fd);
> + if (ret == -1) {
> + PERROR("close");
> + goto error;
> + }
> +
> + FD_ZERO(&rfds);
> + FD_SET(fd, &rfds);
> +
> + ret = syscall(SYS_pselect6_time64, fd + 1, &rfds, NULL, NULL, NULL,
> NULL);
> + /*
> + * There is no fallback to SYS_pselect6, we expect SYS_pselect6_time64
> + * to work and if it doesn't we fail.
> + */
> +
> + if (ret == -1 && errno != ENOSYS) {
> + /* Expected error. */
> + } else if (errno == ENOSYS) {
> + PERROR("[pselect_time64] missing syscall");
> + } else if (ret) {
> + ret = read(wait_fd, buf, BUF_SIZE);
> + if (ret < 0) {
> + PERROR("[pselect_time64] read");
> + }
> + }
> +error:
> + return;
> +#endif
> }
>
> /*
> @@ -501,6 +643,7 @@ void ppoll_fds_ulong_max(FILE *validation_output_file
> __attribute__((unused)))
> static
> void pselect_invalid_fd(FILE *validation_output_file __attribute__((unused)))
> {
> +#ifdef SYS_pselect6
> fd_set rfds;
> int ret;
> int fd;
> @@ -525,6 +668,7 @@ void pselect_invalid_fd(FILE *validation_output_file
> __attribute__((unused)))
> FD_SET(fd, &rfds);
>
> ret = syscall(SYS_pselect6, fd + 1, &rfds, NULL, NULL, NULL, NULL);
> +
> if (ret == -1) {
> /* Expected error. */
> } else if (ret) {
> @@ -535,6 +679,44 @@ void pselect_invalid_fd(FILE *validation_output_file
> __attribute__((unused)))
> }
> error:
> return;
> +#endif
> +}
> +
> +/*
> + * Invalid pointer as writefds, should output a ppoll event
> + * with 0 FDs.
> + */
> +static
> +void pselect_time64_invalid_pointer(
> + FILE *validation_output_file __attribute__((unused)))
> +{
> +#ifdef SYS_pselect6_time64
> + fd_set rfds;
> + int ret;
> + char buf[BUF_SIZE];
> + void *invalid = (void *) 0x42;
> +
> + FD_ZERO(&rfds);
> + FD_SET(wait_fd, &rfds);
> +
> + ret = syscall(SYS_pselect6_time64, 1, &rfds, (fd_set *) invalid,
> NULL, NULL,
> + NULL);
> + /*
> + * There is no fallback to SYS_pselect6, we expect SYS_pselect6_time64
> + * to work and if it doesn't we fail.
> + */
> +
> + if (ret == -1 && errno != ENOSYS) {
> + /* Expected error. */
> + } else if (errno == ENOSYS) {
> + PERROR("[pselect_time64] missing syscall");
> + } else if (ret) {
> + ret = read(wait_fd, buf, BUF_SIZE);
> + if (ret < 0) {
> + PERROR("[pselect_time64] read");
> + }
> + }
> +#endif
> }
>
> /*
> @@ -545,6 +727,7 @@ static
> void pselect_invalid_pointer(
> FILE *validation_output_file __attribute__((unused)))
> {
> +#ifdef SYS_pselect6
> fd_set rfds;
> int ret;
> char buf[BUF_SIZE];
> @@ -563,6 +746,7 @@ void pselect_invalid_pointer(
> PERROR("[pselect] read");
> }
> }
> +#endif
> }
>
> /*
> --
> 2.37.3
>
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