-stable review patch. If anyone has any objections, please let us know. --------------------- From: Jeff Dike Make the PTRACE_SYSEMU checking more robust. It will make sure that system call numbers are reported correctly. If there is a problem, it will disable PTRACE_SYSEMU use and use PTRACE_SYSCALL instead. This fixes a hang on boot on FC6 hosts with a broken PTRACE_SYSEMU. Signed-off-by: Jeff Dike Signed-off-by: Chris Wright Signed-off-by: Greg Kroah-Hartman -- arch/um/os-Linux/start_up.c | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-) --- linux-2.6.21.4.orig/arch/um/os-Linux/start_up.c +++ linux-2.6.21.4/arch/um/os-Linux/start_up.c @@ -144,9 +144,7 @@ static int stop_ptraced_child(int pid, v int exit_with = WEXITSTATUS(status); if (exit_with == 2) non_fatal("check_ptrace : child exited with status 2. " - "Serious trouble happening! Try updating " - "your host skas patch!\nDisabling SYSEMU " - "support."); + "\nDisabling SYSEMU support.\n"); non_fatal("check_ptrace : child exited with exitcode %d, while " "expecting %d; status 0x%x\n", exit_with, exitcode, status); @@ -209,6 +207,7 @@ __uml_setup("nosysemu", nosysemu_cmd_par static void __init check_sysemu(void) { void *stack; + unsigned long regs[MAX_REG_NR]; int pid, n, status, count=0; non_fatal("Checking syscall emulation patch for ptrace..."); @@ -225,11 +224,20 @@ static void __init check_sysemu(void) fatal("check_sysemu : expected SIGTRAP, got status = %d", status); - n = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET, - os_getpid()); - if(n < 0) - fatal_perror("check_sysemu : failed to modify system call " - "return"); + if(ptrace(PTRACE_GETREGS, pid, 0, regs) < 0) + fatal_perror("check_sysemu : PTRACE_GETREGS failed"); + if(PT_SYSCALL_NR(regs) != __NR_getpid){ + non_fatal("check_sysemu got system call number %d, " + "expected %d...", PT_SYSCALL_NR(regs), __NR_getpid); + goto fail; + } + + n = ptrace(PTRACE_POKEUSR, pid, PT_SYSCALL_RET_OFFSET, os_getpid()); + if(n < 0){ + non_fatal("check_sysemu : failed to modify system call " + "return"); + goto fail; + } if (stop_ptraced_child(pid, stack, 0, 0) < 0) goto fail_stopped; -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/