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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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6952a4f646
We recently regressed (cf. [1] and its corresponding fix in [2]) returning ENOMEM when trying to create a process in a pid namespace whose init process/child subreaper has already died. This has caused confusion at least once before that (cf. [3]). Let's add a simple regression test to catch this in the future. [1]:49cb2fc42c("fork: extend clone3() to support setting a PID") [2]:b26ebfe12f("pid: Fix error return value in some cases") [3]:35f71bc0a0("fork: report pid reservation failure properly") Cc: Corey Minyard <cminyard@mvista.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Adrian Reber <areber@redhat.com> Cc: Dmitry Safonov <0x7f454c46@gmail.com> Cc: Andrei Vagin <avagin@gmail.com> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
46 lines
820 B
C
46 lines
820 B
C
#define _GNU_SOURCE
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/types.h>
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#include <sched.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syscall.h>
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#include <sys/wait.h>
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#include "../kselftest.h"
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#include "../kselftest_harness.h"
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#include "../pidfd/pidfd.h"
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/*
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* Regression test for:
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* 35f71bc0a09a ("fork: report pid reservation failure properly")
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* b26ebfe12f34 ("pid: Fix error return value in some cases")
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*/
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TEST(regression_enomem)
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{
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pid_t pid;
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if (geteuid())
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EXPECT_EQ(0, unshare(CLONE_NEWUSER));
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EXPECT_EQ(0, unshare(CLONE_NEWPID));
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pid = fork();
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ASSERT_GE(pid, 0);
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if (pid == 0)
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exit(EXIT_SUCCESS);
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EXPECT_EQ(0, wait_for_pid(pid));
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pid = fork();
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ASSERT_LT(pid, 0);
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ASSERT_EQ(errno, ENOMEM);
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}
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TEST_HARNESS_MAIN
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