Kill a process that tries to branch into a stub and execute a system
call. There are no security implications here - a system call in a
stub is treated the same as a system call anywhere else. But if a
process is trying to branch into a stub, either it is trying something
nasty or it has gone haywire, so it's a good idea to get rid of it in
either case.
Signed-off-by: Jeff Dike <[email protected]>
---
arch/um/os-Linux/skas/process.c | 3 +++
1 file changed, 3 insertions(+)
Index: linux-2.6.22/arch/um/os-Linux/skas/process.c
===================================================================
--- linux-2.6.22.orig/arch/um/os-Linux/skas/process.c 2007-12-05 12:51:53.000000000 -0500
+++ linux-2.6.22/arch/um/os-Linux/skas/process.c 2007-12-05 16:34:55.000000000 -0500
@@ -146,6 +146,9 @@ static void handle_trap(int pid, struct
{
int err, status;
+ if ((UPT_IP(regs) >= STUB_START) && (UPT_IP(regs) < STUB_END))
+ fatal_sigsegv();
+
/* Mark this as a syscall */
UPT_SYSCALL_NR(regs) = PT_SYSCALL_NR(regs->gp);
--
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