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bug #46481: install-info can "corrupt" dir file if interrupted.

Submitted by:  Pedrum Mohageri <pd5rm>
Submitted on:  Thu 19 Nov 2015 09:48:09 PM UTC  
Category: install-infoRelease: 6.0
Priority: 7 - HighSeverity: 3 - Normal
Item Group: bugPrivacy: Public
Open/Closed: OpenAssigned to: None
Status: None

Thu 19 Nov 2015 09:48:09 PM UTC, original submission:

I use Arch and the package manager bailed out on several packages during the install. I traced this to a failed install-info call to add entries for package to the 'dir' that info use.

After strace'ng the code, I observe it will do a open with O_TRUNC flag, and then write out some data. If the process is killed between the open and write, it will leave 0 byte dir file which can't written to by subsequent install-info calls. You should consider replacing this with a 'write to temp/rename temp to dir' changeover that's atomic.

While this is rare occurrence, I've seen numerous failures like this reported on Redhat and Arch forums.

Strace results:
open("dir", O_WRONLY|O_CREAT|O_TRUNC, 0666) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fcf1c842000
write(3, "This is the file .../info/dir, w"..., 867) = 867

Pedrum Mohageri <pd5rm>


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