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Bug 200621 - getxattr() with zero value makes strace call free on invalid pointer.
getxattr() with zero value makes strace call free on invalid pointer.
Product: Fedora
Classification: Fedora
Component: strace (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Roland McGrath
Brian Brock
Depends On:
Blocks: xattrs-tracker
  Show dependency treegraph
Reported: 2006-07-29 00:35 EDT by James Antill
Modified: 2007-11-30 17:11 EST (History)
1 user (show)

See Also:
Fixed In Version: 4.5.15-1
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2007-01-16 22:07:09 EST
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RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

Attachments (Terms of Use)
strace-4.5.14-alt-print_xattr_val.patch (517 bytes, patch)
2006-09-01 11:24 EDT, Dmitry V. Levin
no flags Details | Diff

  None (edit)
Description James Antill 2006-07-29 00:35:55 EDT
 getxattr()/lgetxattr() and presumably fgetxattr() make strace call free() on an
invalid pointer when they return 0 byte values. Eg.

% attr -s mime_type -V '' foo
Attribute "mime_type" set to a 0 byte value for foo:

% attr -g mime_type foo
Attribute "mime_type" had a 0 byte value for foo:

% strace attr -g mime_type foo
lgetxattr("j/src/and-httpd", "user.mime_type"*** glibc detected *** strace:
free(): invalid pointer: 0x082fa530 ***

How reproducible:
Comment 1 Dmitry V. Levin 2006-09-01 11:24:04 EDT
Created attachment 135384 [details]

Proposed fix for the memory corruption bug.
Comment 2 Dmitry V. Levin 2006-11-26 06:41:32 EST
Fixed upstream.
Comment 3 Roland McGrath 2007-01-11 06:15:14 EST
these bugs are fixed upstream in the coming 4.5.15 release
Comment 4 Roland McGrath 2007-01-16 22:07:09 EST
4.5.15 in rawhide and in updates for fc5 and fc6 fixes this.

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