Description Mikael Urankar 2015-06-30 18:29:53 UTC

Created attachment 158195 [details]
sigbus fix

Hi,

I hit the following sigbus on armv6 (texstudio is triggering the sigbus):

gdb texstudio
<snip>

Program received signal SIGBUS, Bus error.
[Switching to Thread 2c462300 (LWP 100271/texstudio)]
cmsMLUsetWide (mlu=0x2cc381e0, Language=0x228bc91c "en", Country=0x228bc379 "US", WideString=0x228bc128)
    at cmsnamed.c:224
224	    cmsUInt16Number Cntry = _cmsAdjustEndianess16(*(cmsUInt16Number*) Country);
Current language:  auto; currently minimal

(gdb) where
#0  cmsMLUsetWide (mlu=0x2cc381e0, Language=0x228bc91c "en", Country=0x228bc379 "US", WideString=0x228bc128)
    at cmsnamed.c:224
#1  0x22897730 in SetTextTags (hProfile=0x2ccd1c00, Description=0x228bc128) at cmsvirt.c:44
#2  0x228972f8 in cmsCreateRGBProfileTHR (ContextID=0x0, WhitePoint=0xbe5f0aa0, Primaries=0xbe5f0a58, 
    TransferFunction=0xbe5f0a4c) at cmsvirt.c:141
#3  0x22898b3c in cmsCreate_sRGBProfileTHR (ContextID=0x0) at cmsvirt.c:658
#4  0x22898c8c in cmsCreate_sRGBProfile () at cmsvirt.c:672
#5  0x224dd158 in GfxColorSpace::setupColorProfiles () from /usr/local/lib/libpoppler.so.49
#6  0x224f1180 in GfxState::GfxState () from /usr/local/lib/libpoppler.so.49
#7  0x2cc3f140 in ?? ()

(gdb) disassemble $pc-18 $pc+16
Dump of assembler code from 0x2289223c to 0x2289225c:
0x2289223c <cmsMLUsetWide+64>:	str	r5, [sp, #12]
0x22892240 <cmsMLUsetWide+68>:	bl	0x2285e138 <$a+96>
0x22892244 <cmsMLUsetWide+72>:	strh	r0, [r11, #-30]
0x22892248 <cmsMLUsetWide+76>:	ldr	r0, [r11, #-24]
0x2289224c <cmsMLUsetWide+80>:	ldrh	r0, [r0]
0x22892250 <cmsMLUsetWide+84>:	bl	0x2285e138 <$a+96>
0x22892254 <cmsMLUsetWide+88>:	strh	r0, [sp, #32]
0x22892258 <cmsMLUsetWide+92>:	ldr	r0, [r11, #-16]
End of assembler dump.

(gdb) info registers
r0             0x228bc379	579584889
<snip>

r0 is not 2-byte aligned.

The attached patch (from debian [1]) fixes that. It was successfully tested by Ulrich Grey.

[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=644473

Thanks.