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authorWANG Chao <chaowang@redhat.com>2014-04-08 02:38:51 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2014-04-08 03:36:06 +0400
commitc4082f36fa3eeb5d4fadc50241b6e3a388561f80 (patch)
tree1a33e8dcd80e5b73504fd27ad13b985687df438c /fs/proc/vmcore.c
parent82e0703b6ca8b549952c1e4f04746f27eaec012d (diff)
downloadlinux-c4082f36fa3eeb5d4fadc50241b6e3a388561f80.tar.xz
vmcore: continue vmcore initialization if PT_NOTE is found empty
Currently when an empty PT_NOTE is detected, vmcore initialization fails. It sounds too harsh. Because PT_NOTE could be empty, for example, one offlined a cpu but never restarted kdump service, and after crash, PT_NOTE program header is there but no data contains. It's better to warn about the empty PT_NOTE and continue to initialise vmcore. And ultimately the multiple PT_NOTE are merged into a single one, all empty PT_NOTE are discarded naturally during the merge. So empty PT_NOTE is not visible to user space and vmcore is as good as expected. Signed-off-by: WANG Chao <chaowang@redhat.com> Cc: Vivek Goyal <vgoyal@redhat.com> Cc: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com> Cc: Greg Pearson <greg.pearson@hp.com> Cc: Baoquan He <bhe@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc/vmcore.c')
-rw-r--r--fs/proc/vmcore.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index ab852715916d..6a8e785b29da 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -484,7 +484,6 @@ static int __init update_note_header_size_elf64(const Elf64_Ehdr *ehdr_ptr)
phdr_ptr->p_memsz = real_sz;
if (real_sz == 0) {
pr_warn("Warning: Zero PT_NOTE entries found\n");
- return -EINVAL;
}
}
@@ -671,7 +670,6 @@ static int __init update_note_header_size_elf32(const Elf32_Ehdr *ehdr_ptr)
phdr_ptr->p_memsz = real_sz;
if (real_sz == 0) {
pr_warn("Warning: Zero PT_NOTE entries found\n");
- return -EINVAL;
}
}