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linux: Implement PTRACE_GETREGSET NT_PRFPREG and NT_X86_XSTATE

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Implement NT_PRFPREG and NT_X86_XSTATE for PTRACE_GETREGSET on amd64.
Chrome's crashpad handler uses these to collect floating-point and
extended CPU register state for crash dumps.

Other architectures retain the previous EINVAL stub behavior.

Signed-off-by:	Ricardo Branco <[email protected]>
PR:		289285
Reviewed by:	kib
Pull-Request:	https://github.com/freebsd/freebsd-src/pull/2165

(cherry picked from commit c515e60406)
This commit is contained in:
Ricardo Branco authored and Pouria Mousavizadeh Tehrani committed 2026-10-26 01:23:16 +03:30
1 parent d8f8031923
commit 8328ca324c
1 file changed
+85 -6
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sys/compat/linux/linux_ptrace.c
+85 -6
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@@ -335,6 +335,87 @@ linux_ptrace_getregset_prstatus(struct thread *td, pid_t pid, l_ulong data)
return (error);
}
#ifdef __amd64__
static int
linux_ptrace_getregset_prfpreg(struct thread *td, pid_t pid, l_ulong data)
{
struct fpreg b_fpreg;
struct linux_pt_fpregset l_fpregset;
struct iovec iov;
size_t len;
int error;
error = copyin((const void *)data, &iov, sizeof(iov));
if (error != 0) {
linux_msg(td, "copyin error %d", error);
return (error);
}
error = kern_ptrace(td, PT_GETFPREGS, pid, &b_fpreg, 0);
if (error != 0)
return (error);
bsd_to_linux_fpregset(&b_fpreg, &l_fpregset);
len = MIN(iov.iov_len, sizeof(l_fpregset));
error = copyout(&l_fpregset, iov.iov_base, len);
if (error != 0) {
linux_msg(td, "copyout error %d", error);
return (error);
}
iov.iov_len = len;
error = copyout(&iov, (void *)data, sizeof(iov));
if (error != 0)
linux_msg(td, "iov copyout error %d", error);
return (error);
}
static int
linux_ptrace_getregset_xstate(struct thread *td, pid_t pid, l_ulong data)
{
struct ptrace_xstate_info info;
struct iovec iov;
void *xstate;
size_t len;
int error;
error = copyin((const void *)data, &iov, sizeof(iov));
if (error != 0) {
linux_msg(td, "copyin error %d", error);
return (error);
}
error = kern_ptrace(td, PT_GETXSTATE_INFO, pid, &info, sizeof(info));
if (error != 0)
return (error);
xstate = malloc(info.xsave_len, M_LINUX, M_WAITOK | M_ZERO);
error = kern_ptrace(td, PT_GETXSTATE, pid, xstate, info.xsave_len);
if (error != 0) {
free(xstate, M_LINUX);
return (error);
}
len = MIN(iov.iov_len, info.xsave_len);
error = copyout(xstate, iov.iov_base, len);
free(xstate, M_LINUX);
if (error != 0) {
linux_msg(td, "copyout error %d", error);
return (error);
}
iov.iov_len = len;
error = copyout(&iov, (void *)data, sizeof(iov));
if (error != 0)
linux_msg(td, "iov copyout error %d", error);
return (error);
}
#endif /* __amd64__ */
static int
linux_ptrace_getregset(struct thread *td, pid_t pid, l_ulong addr, l_ulong data)
{
@@ -342,14 +423,12 @@ linux_ptrace_getregset(struct thread *td, pid_t pid, l_ulong addr, l_ulong data)
switch (addr) {
case LINUX_NT_PRSTATUS:
return (linux_ptrace_getregset_prstatus(td, pid, data));
#ifdef __amd64__
case LINUX_NT_PRFPREG:
linux_msg(td, "PTRAGE_GETREGSET NT_PRFPREG not implemented; "
"returning EINVAL");
return (EINVAL);
return (linux_ptrace_getregset_prfpreg(td, pid, data));
case LINUX_NT_X86_XSTATE:
linux_msg(td, "PTRAGE_GETREGSET NT_X86_XSTATE not implemented; "
"returning EINVAL");
return (EINVAL);
return (linux_ptrace_getregset_xstate(td, pid, data));
#endif
default:
linux_msg(td, "PTRACE_GETREGSET request %#lx not implemented; "
"returning EINVAL", addr);