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Subject[PATCH 2/2] x86/mm/64: Add vsyscall page to /proc/kcore conditionally
Date
The vsyscall page should be visible only if
vsyscall=emulate/native when dumping /proc/kcore.

Signed-off-by: Jia Zhang <zhang.jia@linux.alibaba.com>
Reviewed-by: Jiri Olsa <jolsa@kernel.org>
---
arch/x86/mm/init_64.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 14cd7f8..cbd6ea4 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1193,8 +1193,10 @@ 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
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