Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
signal/x86: In emulate_vsyscall force a signal instead of calling do_exit
Directly calling do_exit with a signal number has the problem that
all of the side effects of the signal don't happen, such as
killing all of the threads of a process instead of just the
calling thread.
So replace do_exit(SIGSYS) with force_fatal_sig(SIGSYS) which
causes the signal handling to take it's normal path and work
as expected.
Cc: Andy Lutomirski <luto@kernel.org>
Link: https://lkml.kernel.org/r/20211020174406.17889-17-ebiederm@xmission.com
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
+2
-1
+2
-1
arch/x86/entry/vsyscall/vsyscall_64.c
+2
-1
arch/x86/entry/vsyscall/vsyscall_64.c
···
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226
if ((!tmp && regs->orig_ax != syscall_nr) || regs->ip != address) {
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warn_bad_vsyscall(KERN_DEBUG, regs,
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"seccomp tried to change syscall nr or ip");
229
-
do_exit(SIGSYS);
229
+
force_fatal_sig(SIGSYS);
230
+
return true;
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}
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regs->orig_ax = -1;
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if (tmp)