Commit-ID: cd026ca2861e7f384d677626a483da797c76b9da Gitweb: https://git.kernel.org/tip/cd026ca2861e7f384d677626a483da797c76b9da Author: Jia Zhang <zhang....@linux.alibaba.com> AuthorDate: Mon, 12 Feb 2018 22:44:54 +0800 Committer: Ingo Molnar <mi...@kernel.org> CommitDate: Tue, 13 Feb 2018 09:15:59 +0100
x86/mm/kcore: Add vsyscall page to /proc/kcore conditionally The vsyscall page should be visible only if vsyscall=emulate/native when dumping /proc/kcore. Signed-off-by: Jia Zhang <zhang....@linux.alibaba.com> Reviewed-by: Jiri Olsa <jo...@kernel.org> Cc: Al Viro <v...@zeniv.linux.org.uk> Cc: Linus Torvalds <torva...@linux-foundation.org> Cc: Peter Zijlstra <pet...@infradead.org> Cc: Thomas Gleixner <t...@linutronix.de> Cc: jo...@redhat.com Link: http://lkml.kernel.org/r/1518446694-21124-3-git-send-email-zhang....@linux.alibaba.com Signed-off-by: Ingo Molnar <mi...@kernel.org> --- arch/x86/mm/init_64.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index 6aa33d1..8ba9c31 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -1193,7 +1193,8 @@ void __init mem_init(void) register_page_bootmem_info(); /* Register memory areas for /proc/kcore */ - kclist_add(&kcore_vsyscall, (void *)VSYSCALL_ADDR, PAGE_SIZE, KCORE_USER); + if (get_gate_vma(&init_mm)) + kclist_add(&kcore_vsyscall, (void *)VSYSCALL_ADDR, PAGE_SIZE, KCORE_USER); mem_init_print_info(NULL); }
