Re: bug on chmod command

[Paul Eggert]

Jim Meyering <address@hidden> writes:

> However, I'm not able to reproduce that with 5.93 and a small
> hierarchy created like this (on a RHEL 2.4.28-sparc system):

I can reproduce the problem as follows on a Debian GNU/Linux stable x86
system:

526-penguin $ mkdir d
527-penguin $ cd d
528-penguin $ mkdir -p {a,b,c}/{c,d,e}/{c,d,e}
529-penguin $ valgrind chmod 600 `find ./`
==9774== Memcheck, a memory error detector for x86-linux.
==9774== Copyright (C) 2002-2005, and GNU GPL'd, by Julian Seward et al.
==9774== Using valgrind-2.4.0, a program supervision framework for x86-linux.
==9774== Copyright (C) 2000-2005, and GNU GPL'd, by Julian Seward et al.
==9774== For more details, rerun with: -v
==9774== 
chmod: fts_read failed: Permission denied
==9774== Invalid read of size 4
==9774==    at 0x804B7B1: fts_close (fts.c:363)
==9774==    by 0x8049D9F: main (chmod.c:313)
==9774==  Address 0x1BA553F4 is 44 bytes inside a block of size 162 free'd
==9774==    at 0x1B904B04: free (vg_replace_malloc.c:152)
==9774==    by 0x804C50A: fts_read (fts.c:517)
==9774==    by 0x80494FD: main (chmod.c:295)
==9774== 
==9774== Invalid read of size 4
==9774==    at 0x804B7D1: fts_close (fts.c:365)
==9774==    by 0x8049D9F: main (chmod.c:313)
==9774==  Address 0x1BA553D0 is 8 bytes inside a block of size 162 free'd
==9774==    at 0x1B904B04: free (vg_replace_malloc.c:152)
==9774==    by 0x804C50A: fts_read (fts.c:517)
==9774==    by 0x80494FD: main (chmod.c:295)
==9774== 
==9774== Invalid free() / delete / delete[]
==9774==    at 0x1B904B04: free (vg_replace_malloc.c:152)
==9774==    by 0x804B7C7: fts_close (fts.c:366)
==9774==    by 0x8049D9F: main (chmod.c:313)
==9774==  Address 0x1BA553C8 is 0 bytes inside a block of size 162 free'd
==9774==    at 0x1B904B04: free (vg_replace_malloc.c:152)
==9774==    by 0x804C50A: fts_read (fts.c:517)
==9774==    by 0x80494FD: main (chmod.c:295)
==9774== 
==9774== ERROR SUMMARY: 3 errors from 3 contexts (suppressed: 13 from 1)
==9774== malloc/free: in use at exit: 24 bytes in 1 blocks.
==9774== malloc/free: 49 allocs, 49 frees, 11509 bytes allocated.
==9774== For counts of detected errors, rerun with: -v
==9774== searching for pointers to 1 not-freed blocks.
==9774== checked 77848 bytes.
==9774== 
==9774== LEAK SUMMARY:
==9774==    definitely lost: 0 bytes in 0 blocks.
==9774==      possibly lost: 0 bytes in 0 blocks.
==9774==    still reachable: 24 bytes in 1 blocks.
==9774==         suppressed: 0 bytes in 0 blocks.
==9774== Reachable blocks (those to which a pointer was found) are not shown.
==9774== To see them, rerun with: --show-reachable=yes
530-penguin $