diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/x86_64/tst-cet-setcontext-1.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/tst-cet-setcontext-1.c | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/tst-cet-setcontext-1.c b/sysdeps/unix/sysv/linux/x86_64/tst-cet-setcontext-1.c new file mode 100644 index 0000000000..388931f5f3 --- /dev/null +++ b/sysdeps/unix/sysv/linux/x86_64/tst-cet-setcontext-1.c @@ -0,0 +1,126 @@ +/* Check getcontext and setcontext on the context from makecontext + with shadow stack. + Copyright (C) 2018-2024 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <https://www.gnu.org/licenses/>. */ + +#include <stdio.h> +#include <stdint.h> +#include <stdlib.h> +#include <ucontext.h> +#include <unistd.h> +#include <sys/mman.h> +#include <stdatomic.h> +#include <x86intrin.h> + +static ucontext_t ctx[5]; +static atomic_int done; + +static void +__attribute__((noinline, noclone)) +f2 (void) +{ + printf ("start f2\n"); + done++; + if (setcontext (&ctx[2]) != 0) + { + printf ("%s: setcontext: %m\n", __FUNCTION__); + exit (EXIT_FAILURE); + } +} + +static void +f1 (void) +{ + printf ("start f1\n"); + if (getcontext (&ctx[2]) != 0) + { + printf ("%s: getcontext: %m\n", __FUNCTION__); + exit (EXIT_FAILURE); + } + if (done) + exit (EXIT_SUCCESS); + f2 (); +} + +static int +do_test (void) +{ + char st1[32768]; + puts ("making contexts"); + if (getcontext (&ctx[0]) != 0) + { + printf ("%s: getcontext: %m\n", __FUNCTION__); + exit (EXIT_FAILURE); + } + if (getcontext (&ctx[1]) != 0) + { + printf ("%s: getcontext: %m\n", __FUNCTION__); + exit (EXIT_FAILURE); + } + + ctx[3].uc_stack.ss_sp = st1; + ctx[3].uc_stack.ss_size = sizeof st1; + ctx[3].uc_link = &ctx[0]; + makecontext (&ctx[3], (void (*) (void)) f1, 0); + + ctx[1].uc_stack.ss_sp = st1; + ctx[1].uc_stack.ss_size = sizeof st1; + ctx[1].uc_link = &ctx[0]; + makecontext (&ctx[1], (void (*) (void)) f1, 0); + + ctx[4].uc_stack.ss_sp = st1; + ctx[4].uc_stack.ss_size = sizeof st1; + ctx[4].uc_link = &ctx[0]; + makecontext (&ctx[4], (void (*) (void)) f1, 0); + + /* NB: When shadow stack is enabled, makecontext calls map_shadow_stack + to allocate a new shadow stack which can be unmapped. The base + address and size of the new shadow stack are returned in __ssp[1] + and __ssp[2]. makecontext is called for CTX1, CTX3 and CTX4. But + only CTX1 is used. New shadow stacks are allocated in the order + of CTX3, CTX1, CTX4. It is very likely that CTX1's shadow stack is + placed between CTX3 and CTX4. We munmap CTX3's and CTX4's shadow + stacks to create gaps above and below CTX1's shadow stack. We check + that setcontext CTX1 works correctly in this case. */ + if (_get_ssp () != 0) + { + if (ctx[3].__ssp[1] != 0 + && munmap ((void *) (uintptr_t) ctx[3].__ssp[1], + (size_t) ctx[3].__ssp[2]) != 0) + { + printf ("%s: munmap: %m\n", __FUNCTION__); + exit (EXIT_FAILURE); + } + + if (ctx[4].__ssp[1] != 0 + && munmap ((void *) (uintptr_t) ctx[4].__ssp[1], + (size_t) ctx[4].__ssp[2]) != 0) + { + printf ("%s: munmap: %m\n", __FUNCTION__); + exit (EXIT_FAILURE); + } + } + + if (setcontext (&ctx[1]) != 0) + { + printf ("%s: setcontext: %m\n", __FUNCTION__); + exit (EXIT_FAILURE); + } + exit (EXIT_FAILURE); +} + +#include <support/test-driver.c> |