[PATCH 2/2] x86/mm/64: Add vsyscall page to /proc/kcore conditionally

From: Jia Zhang
Date: Tue Jan 30 2018 - 01:47:32 EST


The vsyscall page should be visible only if
vsyscall=emulate/native when dumping /proc/kcore.

Signed-off-by: Jia Zhang <zhang.jia@xxxxxxxxxxxxxxxxx>
---
arch/x86/mm/init_64.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index dab78f6..3d4cf33 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1186,8 +1186,9 @@ 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);
}
--
1.8.3.1