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| author | WANG Chao <chaowang@redhat.com> | 2014-04-07 15:38:51 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-04-07 16:36:06 -0700 |
| commit | c4082f36fa3eeb5d4fadc50241b6e3a388561f80 (patch) | |
| tree | 1a33e8dcd80e5b73504fd27ad13b985687df438c /fs/proc | |
| parent | 82e0703b6ca8b549952c1e4f04746f27eaec012d (diff) | |
| download | linux-c4082f36fa3eeb5d4fadc50241b6e3a388561f80.tar.gz linux-c4082f36fa3eeb5d4fadc50241b6e3a388561f80.tar.bz2 linux-c4082f36fa3eeb5d4fadc50241b6e3a388561f80.zip | |
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')
| -rw-r--r-- | fs/proc/vmcore.c | 2 |
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; } } |