From d5dc20f69049c0b8e76df2b0c7d77565a9f3ef7d Mon Sep 17 00:00:00 2001 From: rstone Date: Thu, 24 Nov 2011 18:44:14 +0000 Subject: [PATCH] MFC r227290 and r227291: r227290: Fix the DTrace pid return trap interrupt vector. Previously we were using 31, but that vector is reserved. Without this fix, running dtrace -p would either cause the target process to crash or the kernel to page fault r227291: Replace fasttrap_copyout() with uwrite(). FreeBSD copyout() is not able to write to the .text section of a process. Approved by: re (kib) git-svn-id: svn://svn.freebsd.org/base/releng/9.0@227946 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f --- sys/amd64/amd64/trap.c | 21 ++++++++++--------- sys/amd64/include/segments.h | 2 +- sys/amd64/include/trap.h | 4 ++-- .../uts/intel/dtrace/fasttrap_isa.c | 11 +++++++--- sys/i386/i386/trap.c | 13 +++++++----- sys/i386/include/segments.h | 2 +- sys/i386/include/trap.h | 4 ++-- 7 files changed, 33 insertions(+), 24 deletions(-) diff --git a/sys/amd64/amd64/trap.c b/sys/amd64/amd64/trap.c index 9c72a693..c5f0a71e 100644 --- a/sys/amd64/amd64/trap.c +++ b/sys/amd64/amd64/trap.c @@ -125,7 +125,7 @@ void dblfault_handler(struct trapframe *frame); static int trap_pfault(struct trapframe *, int); static void trap_fatal(struct trapframe *, vm_offset_t); -#define MAX_TRAP_MSG 30 +#define MAX_TRAP_MSG 33 static char *trap_msg[] = { "", /* 0 unused */ "privileged instruction fault", /* 1 T_PRIVINFLT */ @@ -158,6 +158,9 @@ static char *trap_msg[] = { "machine check trap", /* 28 T_MCHK */ "SIMD floating-point exception", /* 29 T_XMMFLT */ "reserved (unknown) fault", /* 30 T_RESERVED */ + "", /* 31 unused (reserved) */ + "DTrace pid return trap", /* 32 T_DTRACE_RET */ + "DTrace fasttrap probe trap", /* 33 T_DTRACE_PROBE */ }; #ifdef KDB @@ -245,28 +248,26 @@ trap(struct trapframe *frame) * handled the trap and modified the trap frame so that this * function can return normally. */ - if (dtrace_trap_func != NULL) - if ((*dtrace_trap_func)(frame, type)) - goto out; if (type == T_DTRACE_PROBE || type == T_DTRACE_RET || type == T_BPTFLT) { struct reg regs; - + fill_frame_regs(frame, ®s); if (type == T_DTRACE_PROBE && dtrace_fasttrap_probe_ptr != NULL && dtrace_fasttrap_probe_ptr(®s) == 0) - goto out; - if (type == T_BPTFLT && + goto out; + else if (type == T_BPTFLT && dtrace_pid_probe_ptr != NULL && dtrace_pid_probe_ptr(®s) == 0) - goto out; - if (type == T_DTRACE_RET && + goto out; + else if (type == T_DTRACE_RET && dtrace_return_probe_ptr != NULL && dtrace_return_probe_ptr(®s) == 0) goto out; - } + if (dtrace_trap_func != NULL && (*dtrace_trap_func)(frame, type)) + goto out; #endif if ((frame->tf_rflags & PSL_I) == 0) { diff --git a/sys/amd64/include/segments.h b/sys/amd64/include/segments.h index 22dc95ab..27965116 100644 --- a/sys/amd64/include/segments.h +++ b/sys/amd64/include/segments.h @@ -214,7 +214,7 @@ struct region_descriptor { #define IDT_XF 19 /* #XF: SIMD Floating-Point Exception */ #define IDT_IO_INTS NRSVIDT /* Base of IDT entries for I/O interrupts. */ #define IDT_SYSCALL 0x80 /* System Call Interrupt Vector */ -#define IDT_DTRACE_RET 0x92 /* DTrace pid provider Interrupt Vector */ +#define IDT_DTRACE_RET 0x20 /* DTrace pid provider Interrupt Vector */ /* * Entries in the Global Descriptor Table (GDT) diff --git a/sys/amd64/include/trap.h b/sys/amd64/include/trap.h index d8e36b5a..a395d624 100644 --- a/sys/amd64/include/trap.h +++ b/sys/amd64/include/trap.h @@ -62,8 +62,8 @@ #define T_MCHK 28 /* machine check trap */ #define T_XMMFLT 29 /* SIMD floating-point exception */ #define T_RESERVED 30 /* reserved (unknown) */ -#define T_DTRACE_RET 31 /* DTrace pid return */ -#define T_DTRACE_PROBE 32 /* DTrace fasttrap probe */ +#define T_DTRACE_RET 32 /* DTrace pid return */ +#define T_DTRACE_PROBE 33 /* DTrace fasttrap probe */ /* XXX most of the following codes aren't used, but could be. */ diff --git a/sys/cddl/contrib/opensolaris/uts/intel/dtrace/fasttrap_isa.c b/sys/cddl/contrib/opensolaris/uts/intel/dtrace/fasttrap_isa.c index 85d9649f..d0db8080 100644 --- a/sys/cddl/contrib/opensolaris/uts/intel/dtrace/fasttrap_isa.c +++ b/sys/cddl/contrib/opensolaris/uts/intel/dtrace/fasttrap_isa.c @@ -97,7 +97,7 @@ uwrite(proc_t *p, void *kaddr, size_t len, uintptr_t uaddr) return (proc_ops(UIO_WRITE, p, kaddr, uaddr, len)); } -#endif +#endif /* sun */ #ifdef __i386__ #define r_rax r_eax #define r_rbx r_ebx @@ -1380,6 +1380,7 @@ fasttrap_pid_probe(struct reg *rp) { int ret = 0; uintptr_t addr = 0; + #ifdef __amd64 if (p->p_model == DATAMODEL_NATIVE) { addr = rp->r_rsp - sizeof (uintptr_t); @@ -1558,7 +1559,7 @@ fasttrap_pid_probe(struct reg *rp) * ------------------------ ----- * a: <= 15 * jmp ftt_size> 5 - * b: <= 15 + * b: <= 15 * int T_DTRACE_RET 2 * ----- * <= 37 @@ -1731,12 +1732,16 @@ fasttrap_pid_probe(struct reg *rp) ASSERT(i <= sizeof (scratch)); + +#if defined(sun) if (fasttrap_copyout(scratch, (char *)addr, i)) { +#else + if (uwrite(curproc, scratch, i, addr)) { +#endif fasttrap_sigtrap(p, curthread, pc); new_pc = pc; break; } - if (tp->ftt_retids != NULL) { curthread->t_dtrace_step = 1; curthread->t_dtrace_ret = 1; diff --git a/sys/i386/i386/trap.c b/sys/i386/i386/trap.c index 5006f41b..b241757e 100644 --- a/sys/i386/i386/trap.c +++ b/sys/i386/i386/trap.c @@ -136,7 +136,7 @@ void dblfault_handler(void); extern inthand_t IDTVEC(lcall_syscall); -#define MAX_TRAP_MSG 30 +#define MAX_TRAP_MSG 33 static char *trap_msg[] = { "", /* 0 unused */ "privileged instruction fault", /* 1 T_PRIVINFLT */ @@ -169,6 +169,10 @@ static char *trap_msg[] = { "machine check trap", /* 28 T_MCHK */ "SIMD floating-point exception", /* 29 T_XMMFLT */ "reserved (unknown) fault", /* 30 T_RESERVED */ + "", /* 31 unused (reserved) */ + "DTrace pid return trap", /* 32 T_DTRACE_RET */ + "DTrace fasttrap probe trap", /* 33 T_DTRACE_PROBE */ + }; #if defined(I586_CPU) && !defined(NO_F00F_HACK) @@ -265,10 +269,6 @@ trap(struct trapframe *frame) * handled the trap and modified the trap frame so that this * function can return normally. */ - if ((type == T_PROTFLT || type == T_PAGEFLT) && - dtrace_trap_func != NULL) - if ((*dtrace_trap_func)(frame, type)) - goto out; if (type == T_DTRACE_PROBE || type == T_DTRACE_RET || type == T_BPTFLT) { struct reg regs; @@ -287,6 +287,9 @@ trap(struct trapframe *frame) dtrace_return_probe_ptr(®s) == 0) goto out; } + if ((type == T_PROTFLT || type == T_PAGEFLT) && + dtrace_trap_func != NULL && (*dtrace_trap_func)(frame, type)) + goto out; #endif if ((frame->tf_eflags & PSL_I) == 0) { diff --git a/sys/i386/include/segments.h b/sys/i386/include/segments.h index 1c1ddee8..9e65c3ce 100644 --- a/sys/i386/include/segments.h +++ b/sys/i386/include/segments.h @@ -207,7 +207,7 @@ struct region_descriptor { #define IDT_XF 19 /* #XF: SIMD Floating-Point Exception */ #define IDT_IO_INTS NRSVIDT /* Base of IDT entries for I/O interrupts. */ #define IDT_SYSCALL 0x80 /* System Call Interrupt Vector */ -#define IDT_DTRACE_RET 0x92 /* DTrace pid provider Interrupt Vector */ +#define IDT_DTRACE_RET 0x20 /* DTrace pid provider Interrupt Vector */ /* * Entries in the Global Descriptor Table (GDT) diff --git a/sys/i386/include/trap.h b/sys/i386/include/trap.h index d8e36b5a..a395d624 100644 --- a/sys/i386/include/trap.h +++ b/sys/i386/include/trap.h @@ -62,8 +62,8 @@ #define T_MCHK 28 /* machine check trap */ #define T_XMMFLT 29 /* SIMD floating-point exception */ #define T_RESERVED 30 /* reserved (unknown) */ -#define T_DTRACE_RET 31 /* DTrace pid return */ -#define T_DTRACE_PROBE 32 /* DTrace fasttrap probe */ +#define T_DTRACE_RET 32 /* DTrace pid return */ +#define T_DTRACE_PROBE 33 /* DTrace fasttrap probe */ /* XXX most of the following codes aren't used, but could be. */ -- 2.42.0