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uml: don't allow processes to call into stub
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 <jdike@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -146,6 +146,9 @@ static void handle_trap(int pid, struct uml_pt_regs *regs,
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{
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int err, status;
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if ((UPT_IP(regs) >= STUB_START) && (UPT_IP(regs) < STUB_END))
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fatal_sigsegv();
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/* Mark this as a syscall */
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UPT_SYSCALL_NR(regs) = PT_SYSCALL_NR(regs->gp);
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