mirrors/Astral
1
0
Fork 0
mirror of https://github.com/Mathewnd/Astral.git synced 2026-10-27 20:58:22 +00:00
Code Issues Packages Projects Releases Wiki Activity

sigreturn: add bad behavior checks and mask flags

Browse Source
This commit is contained in:
Matheus
2026-04-16 17:59:57 -03:00
parent 5eb98748a8
commit a9d874c32d
1 changed files with 6 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files
kernel-src/sys/syscalls/sigreturn.c
+6 -1
View File
@@ -11,11 +11,16 @@
__attribute__((noreturn)) void syscall_sigreturn(context_t *context) {
sigframe_t *sigframe = __builtin_alloca(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");
proc_terminate(SIGSEGV);
}
#ifdef __x86_64__
// CF PF AF ZF SF TF DF OF RF AC
sigframe->context.rflags &= 0x50DD5;
#endif
interrupt_set(false);
signal_altstack(current_thread(), &sigframe->oldstack, NULL);
signal_changemask(current_thread(), SIG_SETMASK, &sigframe->oldmask, NULL);