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Implement PTRACE_GETSIGINFO. This makes Linux strace(1) quieter

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in some cases (strace -f man id > /dev/null).

Reviewed by:	dchagin
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D20691
This commit is contained in:
Edward Tomasz Napierala 2019-07-04 19:44:13 +00:00
parent 2478d444d1
commit de7ea4e414
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=349747
1 changed files with 29 additions and 0 deletions
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29
sys/amd64/linux/linux_ptrace.c
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@ -68,6 +68,7 @@ __FBSDID("$FreeBSD$");
#define LINUX_PTRACE_DETACH 17
#define LINUX_PTRACE_SYSCALL 24
#define LINUX_PTRACE_SETOPTIONS 0x4200
#define LINUX_PTRACE_GETSIGINFO 0x4202
#define LINUX_PTRACE_GETREGSET 0x4204
#define LINUX_PTRACE_SEIZE 0x4206
@ -366,6 +367,31 @@ linux_ptrace_setoptions(struct thread *td, pid_t pid, l_ulong data)
return (kern_ptrace(td, PT_SET_EVENT_MASK, pid, &mask, sizeof(mask)));
}
static int
linux_ptrace_getsiginfo(struct thread *td, pid_t pid, l_ulong data)
{
struct ptrace_lwpinfo lwpinfo;
l_siginfo_t l_siginfo;
int error, sig;
error = kern_ptrace(td, PT_LWPINFO, pid, &lwpinfo, sizeof(lwpinfo));
if (error != 0) {
linux_msg(td, "PT_LWPINFO failed with error %d", error);
return (error);
}
if ((lwpinfo.pl_flags & PL_FLAG_SI) == 0) {
error = EINVAL;
linux_msg(td, "no PL_FLAG_SI, returning %d", error);
return (error);
}
sig = bsd_to_linux_signal(lwpinfo.pl_siginfo.si_signo);
siginfo_to_lsiginfo(&lwpinfo.pl_siginfo, &l_siginfo, sig);
error = copyout(&l_siginfo, (void *)data, sizeof(l_siginfo));
return (error);
}
static int
linux_ptrace_getregs(struct thread *td, pid_t pid, void *data)
{
@ -580,6 +606,9 @@ linux_ptrace(struct thread *td, struct linux_ptrace_args *uap)
case LINUX_PTRACE_SETOPTIONS:
error = linux_ptrace_setoptions(td, pid, uap->data);
break;
case LINUX_PTRACE_GETSIGINFO:
error = linux_ptrace_getsiginfo(td, pid, uap->data);
break;
case LINUX_PTRACE_GETREGSET:
error = linux_ptrace_getregset(td, pid, uap->addr, uap->data);
break;