On 01/08/2012 12:44 AM, Hershkovitz, Koby (Koby) wrote:
> Indeed I have check this patch is correctly in place.
> The relevant strace output is:
> mmap2(0x62290000, 1064960, PROT_READ|PROT_WRITE|PROT_EXEC,
> MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, 0, 0) = 0x62290000
That mmap2 is OK because the MAP_FIXED address 0x62290000 is a multiple
of 0x4000 (16KB).
[snip]
> open("/tmp/vgdb-pipe-shared-mem-vgdb-1793-by-root-on-???",
> O_RDWR|O_CREAT, 0666) = 3
> write(3,
> "\0\0\0\0\0\0\0\0\0\0\0\0\360\240\0068\0\210\2468\240\26\0\0\4\0\0\0\350
> \24\0\0", 32) = 32
> mmap2(0x401d000, 32, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_FIXED, 3, 0) =
> -1 EINVAL (Invalid argument)
That mmap2 is bad because the MAP_FIXED address 0x401d000 is not a multiple
of 0x4000 (the remainder is 0x1000.)
The file descriptor "3" in the bad mmap2() is the result of the open() on
"/tmp/vgdb-pipe-shared-mem-vgdb-1793-by-root-on-???". This proves that
vgdb is at fault for not aligning the address appropriately.
I have entered a bug report (https://bugs.kde.org/show_bug.cgi?id=290974
"vgdb must align pages to VKI_SHMLBA (16KB) on ARM")
for this case.
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