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Date: Mon, 15 Jan 2007 23:33:03 +0200
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Subject: Re: [devel] q: glibc malloc s*cks?
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On Mon, Jan 15, 2007 at 05:13:42PM +0300, Dmitry V. Levin wrote:
> =F3=CB=C1=D6=C9=D4=C5 sr@, =DE=D4=CF glibc malloc =D5=D6=C5 =C4=C1=D7=CE=
=CF =C9=D3=D0=CF=CC=D8=DA=D5=C5=D4 mmap.
> =F3=CD. =D4=D6. http://sourceware.org/ml/libc-alpha/2006-11/msg00061.ht=
ml

=E1=C7=C1=DD=C1=DA=C2=CC=C9=CE.

$ echo "int main() { return malloc( 1) ? 0 : 1; }" > 1.c
$ gcc 1.c
$ strace ./a.out
execve("./a.out", ["./a.out"], [/* 49 vars */]) =3D 0
brk(0)                                  =3D 0x804a000
access("/etc/ld.so.preload", R_OK)      =3D -1 ENOENT (No such file or di=
rectory)
open("/etc/ld.so.cache", O_RDONLY)      =3D 4
fstat64(4, {st_mode=3DS_IFREG|0644, st_size=3D62887, ...}) =3D 0
mmap2(NULL, 62887, PROT_READ, MAP_PRIVATE, 4, 0) =3D 0xb7f82000
close(4)                                =3D 0
open("/lib/libc.so.6", O_RDONLY)        =3D 4
read(4, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\232b\1"..., 512)=
 =3D 512
fstat64(4, {st_mode=3DS_IFREG|0755, st_size=3D1167868, ...}) =3D 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)=
 =3D 0xb7f81000
mmap2(NULL, 1173764, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 4, 0=
) =3D 0xb7e62000
mmap2(0xb7f7b000, 12288, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_=
DENYWRITE, 4, 0x119) =3D 0xb7f7b000
mmap2(0xb7f7e000, 10500, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_=
ANONYMOUS, -1, 0) =3D 0xb7f7e000
close(4)                                =3D 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0)=
 =3D 0xb7e61000
set_thread_area({entry_number:-1 -> 6, base_addr:0xb7e616c0, limit:104857=
5, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_p=
resent:0, useable:1}) =3D 0
mprotect(0xb7f7b000, 4096, PROT_READ)   =3D 0
munmap(0xb7f82000, 62887)               =3D 0
brk(0)                                  =3D 0x804a000
brk(0x806b000)                          =3D 0x806b000
exit_group(0)                           =3D ?
Process 6119 detached

$ rpm -q glibc
glibc-2.5-alt3