Bug in setrlimit() on FreeBSD 4.10-RELEASE-p2

[Marcus Grando]

Hi list,

I discovered one bug in setrlimit on 4.10-RELEASE-p2. When setting 
rlim_cur < 1474268*1024, system return SIGBUS, but rlim_cur=1474268*1024 
work.

On 4.10-RELEASE this issue not occurs.

Example and strace above...

--example.c--
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>

int main()
{
         struct rlimit limit;

         limit.rlim_cur=1474267*1024;
         limit.rlim_max=1536000*1024;
         setrlimit(RLIMIT_STACK , &limit);
         exit(0);
}
--

--strace on 4.10-RELEASE-p2--
execve("./setrlimit-bug", ["./setrlimit-bug"], [/* 14 vars */]) = 0
mmap(0, 2048, PROT_READ|PROT_WRITE, MAP_ANON, -1, 0) = 0x65c65000
munmap(0x65c65000, 2048)                = 0
__sysctl([hw.pagesize], 2, "\0\20\0\0", [4], NULL, 0) = 0
mmap(0, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0) = 
0x65c65000
geteuid(0xbfbffca4)                     = 0
getuid()                                = 0 (euid 0)
getegid(0xbfbffca4)                     = 0
getgid()                                = 0 (egid 0)
open("/etc/libmap.conf", O_RDONLY)      = -1 ENOENT (No such file or 
directory)
open("/var/run/ld-elf.so.hints", O_RDONLY) = 3
read(3, "Ehnt\1\0\0\0\200\0\0\0=\0\0\0\0\0\0\0<\0\0\0\0\0\0\0\0"..., 
128) = 128
lseek(3, 128, SEEK_SET)                 = 128
read(3, "/usr/lib:/usr/lib/compat:/usr/lo"..., 61) = 61
close(3)                                = 0
access("/usr/lib/libc.so.4", F_OK)      = 0
open("/usr/lib/libc.so.4", O_RDONLY)    = 3
fstat(3, {st_mode=S_IFREG|0444, st_size=677180, ...}) = 0
read(3, "\177ELF\1\1\1\t\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\254$\1"..., 
4096) = 4096
mmap(0, 724992, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_NOCORE, 3, 0) = 
0x65c6d000
mprotect(0x65d06000, 4096, PROT_READ|PROT_WRITE|PROT_EXEC) = 0
mprotect(0x65d06000, 4096, PROT_READ|PROT_EXEC) = 0
mmap(0x65d07000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 
0x99000) = 0x65d07000
mmap(0x65d0b000, 77824, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_ANON, -1, 0) = 0x65d0b000
close(3)                                = 0
mmap(0, 128, PROT_READ|PROT_WRITE, MAP_ANON, -1, 0) = 0x65d1e000
munmap(0x65d1e000, 128)                 = 0
mmap(0, 13360, PROT_READ|PROT_WRITE, MAP_ANON, -1, 0) = 0x65d1e000
munmap(0x65d1e000, 13360)               = 0
sigaction(SIGILL, {0x65c4f520, [], 0}, {SIG_DFL}) = 0
sigprocmask(SIG_BLOCK, NULL, [])        = 0
sigaction(SIGILL, {SIG_DFL}, NULL)      = 0
sigprocmask(SIG_BLOCK, ~[ILL TRAP ABRT EMT FPE BUS SEGV SYS], []) = 0
sigprocmask(SIG_SETMASK, [], NULL)      = 0
setrlimit(RLIMIT_STACK, {rlim_cur=1474267*1024, rlim_max=1536000*1024}) = 0
--- SIGBUS (Bus error) ---
--- SIGBUS (Bus error) ---
--

--strace on 4.10-RELEASE--
execve("./setrlimit-bug", ["./setrlimit-bug"], [/* 17 vars */]) = 0
mmap(0, 2048, PROT_READ|PROT_WRITE, MAP_ANON, -1, 0) = 0x46865000
munmap(0x46865000, 2048)                = 0
__sysctl([hw.pagesize], 2, "\0\20\0\0", [4], NULL, 0) = 0
mmap(0, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANON, -1, 0) = 
0x46865000
geteuid(0xbfbffc44)                     = 0
getuid()                                = 0 (euid 0)
getegid(0xbfbffc44)                     = 0
getgid()                                = 0 (egid 0)
open("/etc/libmap.conf", O_RDONLY)      = -1 ENOENT (No such file or 
directory)
open("/var/run/ld-elf.so.hints", O_RDONLY) = 3
read(3, "Ehnt\1\0\0\0\200\0\0\0<\3\0\0\0\0\0\0;\3\0\0\0\0\0\0\0"..., 
128) = 128
lseek(3, 128, SEEK_SET)                 = 128
read(3, "/usr/lib:/usr/lib/compat:/usr/lo"..., 828) = 828
close(3)                                = 0
access("/usr/lib/libc.so.4", F_OK)      = 0
open("/usr/lib/libc.so.4", O_RDONLY)    = 3
fstat(3, {st_mode=S_IFREG|0444, st_size=677180, ...}) = 0
read(3, "\177ELF\1\1\1\t\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\254$\1"..., 
4096) = 4096
mmap(0, 724992, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_NOCORE, 3, 0) = 
0x4686d000
mprotect(0x46906000, 4096, PROT_READ|PROT_WRITE|PROT_EXEC) = 0
mprotect(0x46906000, 4096, PROT_READ|PROT_EXEC) = 0
mmap(0x46907000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 
0x99000) = 0x46907000
mmap(0x4690b000, 77824, PROT_READ|PROT_WRITE, 
MAP_PRIVATE|MAP_FIXED|MAP_ANON, -1, 0) = 0x4690b000
close(3)                                = 0
mmap(0, 128, PROT_READ|PROT_WRITE, MAP_ANON, -1, 0) = 0x4691e000
munmap(0x4691e000, 128)                 = 0
mmap(0, 13360, PROT_READ|PROT_WRITE, MAP_ANON, -1, 0) = 0x4691e000
munmap(0x4691e000, 13360)               = 0
sigaction(SIGILL, {0x4684f520, [], 0}, {SIG_DFL}) = 0
sigprocmask(SIG_BLOCK, NULL, [])        = 0
sigaction(SIGILL, {SIG_DFL}, NULL)      = 0
sigprocmask(SIG_BLOCK, ~[ILL TRAP ABRT EMT FPE BUS SEGV SYS], []) = 0
sigprocmask(SIG_SETMASK, [], NULL)      = 0
setrlimit(RLIMIT_STACK, {rlim_cur=1024*1024, rlim_max=1536000*1024}) = 0
exit(0)                                 = ?
--

Regards

-- 
Marcus Grando
Grupos Internet S/A
marcus(at)corp.grupos.com.br