* [PATCH] vmcore: continue vmcore initialization if PT_NOTE is found empty
@ 2014-03-21 3:20 ` WANG Chao
0 siblings, 0 replies; 2+ messages in thread
From: WANG Chao @ 2014-03-21 3:20 UTC (permalink / raw)
To: Vivek Goyal, Greg Pearson, Andrew Morton, HATAYAMA Daisuke, bhe
Cc: kexec, linux-kernel
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>
---
fs/proc/vmcore.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index 88d4585..dc71bf9 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;
}
}
--
1.8.5.3
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [PATCH] vmcore: continue vmcore initialization if PT_NOTE is found empty
@ 2014-03-21 3:20 ` WANG Chao
0 siblings, 0 replies; 2+ messages in thread
From: WANG Chao @ 2014-03-21 3:20 UTC (permalink / raw)
To: Vivek Goyal, Greg Pearson, Andrew Morton, HATAYAMA Daisuke, bhe
Cc: kexec, linux-kernel
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>
---
fs/proc/vmcore.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index 88d4585..dc71bf9 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;
}
}
--
1.8.5.3
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2014-03-21 3:20 [PATCH] vmcore: continue vmcore initialization if PT_NOTE is found empty WANG Chao
2014-03-21 3:20 ` WANG Chao
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