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SubjectRe: Segfault on the i386 enter instruction
Date
On Friday 12 May 2006 16:16, Tomasz Malesinski wrote:
> The code attached below segfaults on the enter instruction. It works
> when a stack frame is created by the three commented out
> instructions and also when the first operand of the enter instruction
> is small (less than about 6500 on my system).
>
> AFAIK, the only difference between creating a stack frame with the
> enter instruction or push/mov/sub is that enter checks if the new
> value of esp is inside the stack segment limit.
>
> I tested it on a vanilla kernel 2.4.26 on Intel Celeron and also on
> probably non-vanilla 2.6.16.13 running on 3 dual core AMD Opteron,
> quite busy, server. It is working in 32-bit mode. Interestingly, on
> the second machine sometimes the program worked correctly.

Does not segfault for me:

# gcc Segfault.S

# ./a.out
asdf

# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 11
model name : Intel(R) Celeron(TM) CPU 1200MHz
stepping : 1
cpu MHz : 1196.201
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse
bogomips : 2395.77

# gcc -v 2>&1 | tail -1
gcc version 3.4.3

--
vda
--
vda
-
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