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Fix bug with disabling sigaltstack()

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Justine Tunney 2024-07-20 01:00:16 -07:00
parent 493ffc9b7f
commit 6a5d4ed65b
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GPG key ID: BE714B4575D6E328
2 changed files with 43 additions and 1 deletions
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3
libc/calls/sigaltstack.c
View file

@ -132,7 +132,8 @@ int sigaltstack(const struct sigaltstack *neu, struct sigaltstack *old) {
if (neu && ((neu->ss_size >> 32) || //
(neu->ss_flags & ~(SS_ONSTACK | SS_DISABLE)))) {
rc = einval();
} else if (neu && neu->ss_size < __get_minsigstksz()) {
} else if (neu && !(neu->ss_flags & SS_DISABLE) &&
neu->ss_size < __get_minsigstksz()) {
rc = enomem();
} else if (IsLinux()) {
rc = sys_sigaltstack(neu, old);

41
test/libc/calls/sigaltstack_test.c Normal file
View file

@ -0,0 +1,41 @@
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2024 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/struct/sigaltstack.h"
#include "libc/calls/calls.h"
#include "libc/errno.h"
#include "libc/sysv/consts/ss.h"
#include "libc/testlib/testlib.h"
TEST(sigaltstack, badFlag) {
struct sigaltstack ss;
ss.ss_flags = -1;
ss.ss_size = 0;
ss.ss_sp = 0;
EXPECT_SYS(EINVAL, -1, sigaltstack(&ss, 0));
}
TEST(sigaltstack, disable) {
struct sigaltstack ss;
ss.ss_flags = SS_DISABLE;
ss.ss_size = 0;
ss.ss_sp = 0;
EXPECT_SYS(0, 0, sigaltstack(&ss, 0));
EXPECT_SYS(0, 0, sigaltstack(0, &ss));
EXPECT_EQ(SS_DISABLE, ss.ss_flags);
}