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sigreturn: add bad behavior checks and mask flags

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Matheus
2026-04-16 17:59:57 -03:00
parent 5eb98748a8
commit a9d874c32d
1 changed files with 6 additions and 1 deletions
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kernel-src/sys/syscalls/sigreturn.c
+6 -1
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@@ -11,11 +11,16 @@
__attribute__((noreturn)) void syscall_sigreturn(context_t *context) { __attribute__((noreturn)) void syscall_sigreturn(context_t *context) {
sigframe_t *sigframe = __builtin_alloca(ARCH_SIGFRAME_SIZE); sigframe_t *sigframe = __builtin_alloca(ARCH_SIGFRAME_SIZE);
int error = usercopy_fromuser(sigframe, (void *)CTX_SP(context), ARCH_SIGFRAME_SIZE); int error = usercopy_fromuser(sigframe, (void *)CTX_SP(context), ARCH_SIGFRAME_SIZE);
if (error || ARCH_CONTEXT_ISUSER(&sigframe->context) == false) { if (error || ARCH_CONTEXT_ISUSER(&sigframe->context) == false || !IS_USER_ADDRESS(CTX_IP(&sigframe->context))) {
printf("syscall_sigreturn: bad return stack or bad return information\n"); printf("syscall_sigreturn: bad return stack or bad return information\n");
proc_terminate(SIGSEGV); proc_terminate(SIGSEGV);
} }
#ifdef __x86_64__
// CF PF AF ZF SF TF DF OF RF AC
sigframe->context.rflags &= 0x50DD5;
#endif
interrupt_set(false); interrupt_set(false);
signal_altstack(current_thread(), &sigframe->oldstack, NULL); signal_altstack(current_thread(), &sigframe->oldstack, NULL);
signal_changemask(current_thread(), SIG_SETMASK, &sigframe->oldmask, NULL); signal_changemask(current_thread(), SIG_SETMASK, &sigframe->oldmask, NULL);