From: Ian Wienand Date: Tue, 20 Nov 2007 03:12:46 +0000 (+1100) Subject: [IA64] set_thread_area fails in IA32 chroot X-Git-Tag: MMI-PSA29.97-13-9~37940^2~6 X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=e384f41409cb9e543fbc84b375e2ba46cbcbec6a;p=GitHub%2FMotorolaMobilityLLC%2Fkernel-slsi.git [IA64] set_thread_area fails in IA32 chroot I tried to upgrade an IA32 chroot on my IA64 to a new glibc with TLS. It kept dying because set_thread_area was returning -ESRCH (bugs.debian.org/451939). I instrumented arch/ia64/ia32/sys_ia32.c:get_free_idx() and ended up seeing output like [pid] idx desc->a desc->b ----------------------------- [2710] 0 -> c6b0ffff 40dff31b [2710] 1 -> 0 0 [2710] 2 -> 0 0 [2710] 0 -> c6b0ffff 40dff31b [2710] 1 -> c6b0ffff 40dff31b [2710] 2 -> 0 0 [2711] 0 -> c6b0ffff 40dff31b [2711] 1 -> c6b0ffff 40dff31b [2711] 2 -> 48c0ffff 40dff317 which suggested to me that TLS pointers were surviving exec() calls, leading to GDT pointers filling up and the eventual failure of get_free_idx(). I think the solution is flushing the tls array on exec. Signed-Off-By: Ian Wienand Signed-off-by: Tony Luck --- diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c index a70ad185725c..7377d323131d 100644 --- a/arch/ia64/kernel/process.c +++ b/arch/ia64/kernel/process.c @@ -739,6 +739,7 @@ flush_thread (void) ia32_drop_ia64_partial_page_list(current); current->thread.task_size = IA32_PAGE_OFFSET; set_fs(USER_DS); + memset(current->thread.tls_array, 0, sizeof(current->thread.tls_array)); } #endif }