1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2019 ARM Limited 4 * 5 * Place a fake sigframe on the stack at a misaligned SP: on sigreturn 6 * Kernel must spot this attempt and the test case is expected to be 7 * terminated via SEGV. 8 */ 9 10 #include <signal.h> 11 #include <ucontext.h> 12 13 #include "test_signals_utils.h" 14 #include "testcases.h" 15 16 struct fake_sigframe sf; 17 18 static int fake_sigreturn_misaligned_run(struct tdescr *td, 19 siginfo_t *si, ucontext_t *uc) 20 { 21 /* just to fill the ucontext_t with something real */ 22 if (!get_current_context(td, &sf.uc, sizeof(sf.uc))) 23 return 1; 24 25 /* Forcing sigframe on misaligned SP (16 + 3) */ 26 fake_sigreturn(&sf, sizeof(sf), 3); 27 28 return 1; 29 } 30 31 struct tdescr tde = { 32 .name = "FAKE_SIGRETURN_MISALIGNED_SP", 33 .descr = "Triggers a sigreturn with a misaligned sigframe", 34 .sig_ok = SIGSEGV, 35 .timeout = 3, 36 .run = fake_sigreturn_misaligned_run, 37 }; 38