diff options
| author | Mike Frysinger | 2010-02-12 07:24:34 +0000 |
|---|---|---|
| committer | Mike Frysinger | 2010-03-09 00:30:51 -0500 |
| commit | 9e228ee9eae97b533d3b3133f76478c70dbd4294 (patch) | |
| tree | 401bac08d031de57e8353e83663cb51515c905dd /arch/blackfin | |
| parent | 600482c13d3d3612d71f39d8aaec47f63aafa801 (diff) | |
Blackfin: check for bad syscalls after tracing it
We want to report all system calls (even invalid ones) to the tracing
layers, so check the NR only after we've notified.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'arch/blackfin')
| -rw-r--r-- | arch/blackfin/mach-common/entry.S | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S index 0a9e458d0f7e..6c20044c7f4c 100644 --- a/arch/blackfin/mach-common/entry.S +++ b/arch/blackfin/mach-common/entry.S @@ -626,13 +626,6 @@ ENTRY(_system_call) p0 = [sp + PT_ORIG_P0]; #endif /* CONFIG_IPIPE */ - /* Check the System Call */ - r7 = __NR_syscall; - /* System call number is passed in P0 */ - r6 = p0; - cc = r6 < r7; - if ! cc jump .Lbadsys; - /* are we tracing syscalls?*/ r7 = sp; r6.l = lo(ALIGN_PAGE_MASK); @@ -645,6 +638,12 @@ ENTRY(_system_call) CC = BITTST(r7,TIF_SINGLESTEP); if CC JUMP _sys_trace; + /* Make sure the system call # is valid */ + p4 = __NR_syscall; + /* System call number is passed in P0 */ + cc = p4 <= p0; + if cc jump .Lbadsys; + /* Execute the appropriate system call */ p4 = p0; @@ -741,9 +740,14 @@ _sys_trace: r0 = sp; pseudo_long_call _syscall_trace_enter, p5; - /* Execute the appropriate system call */ - + /* Make sure the system call # is valid */ p4 = [SP + PT_P0]; + p3 = __NR_syscall; + cc = p3 <= p4; + r0 = -ENOSYS; + if cc jump .Lsys_trace_badsys; + + /* Execute the appropriate system call */ p5.l = _sys_call_table; p5.h = _sys_call_table; p5 = p5 + (p4 << 2); @@ -761,6 +765,7 @@ _sys_trace: SP += -12; call (p5); SP += 24; +.Lsys_trace_badsys: [sp + PT_R0] = r0; r0 = sp; |