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8420e08fe3
When in seccomp mode, we would hang forever on the futex if a child has died unexpectedly. In contrast, ptrace mode will notice it and kill the corresponding thread when it fails to run it. Fix this issue using a new IRQ that is fired after a SIGCHLD and keeping an (internal) list of all MMs. In the IRQ handler, find the affected MM and set its PID to -1 as well as the futex variable to FUTEX_IN_KERN. This, together with futex returning -EINTR after the signal is sufficient to implement a race-free detection of a child dying. Note that this also enables IRQ handling while starting a userspace process. This should be safe and SECCOMP requires the IRQ in case the process does not come up properly. Signed-off-by: Benjamin Berg <benjamin@sipsolutions.net> Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Link: https://patch.msgid.link/20250602130052.545733-5-benjamin@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com>
21 lines
462 B
C
21 lines
462 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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*/
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#ifndef __SKAS_H
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#define __SKAS_H
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#include <sysdep/ptrace.h>
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extern int using_seccomp;
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extern int userspace_pid[];
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extern void new_thread_handler(void);
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extern void handle_syscall(struct uml_pt_regs *regs);
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extern unsigned long current_stub_stack(void);
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extern struct mm_id *current_mm_id(void);
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extern void current_mm_sync(void);
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#endif
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