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| author | kib <kib@FreeBSD.org> | 2010-01-23 11:45:35 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2010-01-23 11:45:35 +0000 |
| commit | ddbe48bd563ccf41f12cf0b706b4a5c7637cccbe (patch) | |
| tree | a22c8a20fb7f2ce9b1f9c1c3c2cdc8e817568cc0 /sys/kern/sys_process.c | |
| parent | a22fc66b6e80c44e0ad8bc552f3c955b8ab5d737 (diff) | |
| download | FreeBSD-src-ddbe48bd563ccf41f12cf0b706b4a5c7637cccbe.zip FreeBSD-src-ddbe48bd563ccf41f12cf0b706b4a5c7637cccbe.tar.gz | |
For PT_TO_SCE stop that stops the ptraced process upon syscall entry,
syscall arguments are collected before ptracestop() is called. As a
consequence, debugger cannot modify syscall or its arguments.
For i386, amd64 and ia32 on amd64 MD syscall(), reread syscall number
and arguments after ptracestop(), if debugger modified anything in the
process environment. Since procfs stopeven requires number of syscall
arguments in p_xstat, this cannot be solved by moving stop/trace point
before argument fetching.
Move the code to read arguments into separate function
fetch_syscall_args() to avoid code duplication. Note that ktrace point
for modified syscall is intentionally recorded twice, once with original
arguments, and second time with the arguments set by debugger.
PT_TO_SCX stop is executed after cpu_syscall_set_retval() already.
Reported by: Ali Polatel <alip exherbo org>
Briefly discussed with: jhb
MFC after: 3 weeks
Diffstat (limited to 'sys/kern/sys_process.c')
| -rw-r--r-- | sys/kern/sys_process.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/sys/kern/sys_process.c b/sys/kern/sys_process.c index dfc36ba..3c6394c 100644 --- a/sys/kern/sys_process.c +++ b/sys/kern/sys_process.c @@ -816,6 +816,7 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) case PT_WRITE_I: case PT_WRITE_D: + td2->td_dbgflags |= TDB_USERWR; write = 1; /* FALLTHROUGH */ case PT_READ_I: @@ -884,6 +885,7 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) break; case PIOD_WRITE_D: case PIOD_WRITE_I: + td2->td_dbgflags |= TDB_USERWR; uio.uio_rw = UIO_WRITE; break; default: @@ -906,6 +908,7 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) goto sendsig; /* in PT_CONTINUE above */ case PT_SETREGS: + td2->td_dbgflags |= TDB_USERWR; error = PROC_WRITE(regs, td2, addr); break; @@ -914,6 +917,7 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) break; case PT_SETFPREGS: + td2->td_dbgflags |= TDB_USERWR; error = PROC_WRITE(fpregs, td2, addr); break; @@ -922,6 +926,7 @@ kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) break; case PT_SETDBREGS: + td2->td_dbgflags |= TDB_USERWR; error = PROC_WRITE(dbregs, td2, addr); break; |
