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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/um/kernel/skas/clone.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | arch/um/kernel/skas/clone.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/arch/um/kernel/skas/clone.c b/arch/um/kernel/skas/clone.c new file mode 100644 index 000000000..ff5061f29 --- /dev/null +++ b/arch/um/kernel/skas/clone.c @@ -0,0 +1,47 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de) + * Copyright (C) 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) + */ + +#include <signal.h> +#include <sched.h> +#include <asm/unistd.h> +#include <sys/time.h> +#include <as-layout.h> +#include <ptrace_user.h> +#include <stub-data.h> +#include <sysdep/stub.h> + +/* + * This is in a separate file because it needs to be compiled with any + * extraneous gcc flags (-pg, -fprofile-arcs, -ftest-coverage) disabled + * + * Use UM_KERN_PAGE_SIZE instead of PAGE_SIZE because that calls getpagesize + * on some systems. + */ + +void __attribute__ ((__section__ (".__syscall_stub"))) +stub_clone_handler(void) +{ + struct stub_data *data = get_stub_page(); + long err; + + err = stub_syscall2(__NR_clone, CLONE_PARENT | CLONE_FILES | SIGCHLD, + (unsigned long)data + UM_KERN_PAGE_SIZE / 2); + if (err) { + data->parent_err = err; + goto done; + } + + err = stub_syscall4(__NR_ptrace, PTRACE_TRACEME, 0, 0, 0); + if (err) { + data->child_err = err; + goto done; + } + + remap_stack_and_trap(); + + done: + trap_myself(); +} |