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authorRich Felker <dalias@aerifal.cx>2014-01-02 17:03:34 -0500
committerRich Felker <dalias@aerifal.cx>2014-01-02 17:03:34 -0500
commit7a995fe706e519a4f55399776ef0df9596101f93 (patch)
tree72e03908db98617da9d06eadb8e1d83a0206772d /tools
parent5c81b8fe453994a74afa7cd355dd707ee2d01a24 (diff)
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disable sbrk for all values of increment except 0
use of sbrk is never safe; it conflicts with malloc, and malloc may be
used internally by the implementation basically anywhere. prior to
this change, applications attempting to use sbrk to do their own heap
management simply caused untrackable memory corruption; now, they will
fail with ENOMEM allowing the errors to be fixed.

sbrk(0) is still permitted as a way to get the current brk; some
misguided applications use this as a measurement of their memory
usage or for other related purposes, and such usage is harmless.

eventually sbrk may be re-added if/when malloc is changed to avoid
using the brk by using mmap for all allocations.
Diffstat (limited to 'tools')
0 files changed, 0 insertions, 0 deletions