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authorKairui Song <kasong@redhat.com>2019-03-08 11:05:08 +0800
committerThomas Gleixner <tglx@linutronix.de>2019-03-23 12:11:49 +0100
commitffc8599aa9763f39f6736a79da4d1575e7006f9a (patch)
tree564374b91fdfced43fbcbf2310cb05e3ca9759a4 /include
parentf7798711adeebde3c59ddd797a3f2da36c1005be (diff)
downloadlinux-ffc8599aa9763f39f6736a79da4d1575e7006f9a.tar.bz2
x86/gart: Exclude GART aperture from kcore
On machines where the GART aperture is mapped over physical RAM, /proc/kcore contains the GART aperture range. Accessing the GART range via /proc/kcore results in a kernel crash. vmcore used to have the same issue, until it was fixed with commit 2a3e83c6f96c ("x86/gart: Exclude GART aperture from vmcore")', leveraging existing hook infrastructure in vmcore to let /proc/vmcore return zeroes when attempting to read the aperture region, and so it won't read from the actual memory. Apply the same workaround for kcore. First implement the same hook infrastructure for kcore, then reuse the hook functions introduced in the previous vmcore fix. Just with some minor adjustment, rename some functions for more general usage, and simplify the hook infrastructure a bit as there is no module usage yet. Suggested-by: Baoquan He <bhe@redhat.com> Signed-off-by: Kairui Song <kasong@redhat.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Jiri Bohac <jbohac@suse.cz> Acked-by: Baoquan He <bhe@redhat.com> Cc: Borislav Petkov <bp@alien8.de> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Omar Sandoval <osandov@fb.com> Cc: Dave Young <dyoung@redhat.com> Link: https://lkml.kernel.org/r/20190308030508.13548-1-kasong@redhat.com
Diffstat (limited to 'include')
-rw-r--r--include/linux/kcore.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/kcore.h b/include/linux/kcore.h
index 8c3f8c14eeaa..c843f4a9c512 100644
--- a/include/linux/kcore.h
+++ b/include/linux/kcore.h
@@ -44,6 +44,8 @@ void kclist_add_remap(struct kcore_list *m, void *addr, void *vaddr, size_t sz)
m->vaddr = (unsigned long)vaddr;
kclist_add(m, addr, sz, KCORE_REMAP);
}
+
+extern int __init register_mem_pfn_is_ram(int (*fn)(unsigned long pfn));
#else
static inline
void kclist_add(struct kcore_list *new, void *addr, size_t size, int type)