Commit:     e06173bde0ec9830a296720f8cd7cb2f17b76fa4
Parent:     a9b71b6c5473d2c1526deac0a1a207fe476f6088
Author:     Jeff Dike <[EMAIL PROTECTED]>
AuthorDate: Mon Feb 4 22:31:12 2008 -0800
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Tue Feb 5 09:44:30 2008 -0800

    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 <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
 arch/um/os-Linux/skas/process.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index 862fea0..8ab2f5c 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -146,6 +146,9 @@ static void handle_trap(int pid, struct uml_pt_regs *regs,
        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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