[dpdk-dev] [PATCH] eal: fix crash on mmap error in rte_eal_hugepage_attach()

[Sergio Gonzalez Monroy]

On 28/09/2016 11:52, maciej.czekaj at caviumnetworks.com wrote:
> From: Maciej Czekaj <maciej.czekaj at caviumnetworks.com>
>
> In ASLR-enabled system, it is possible that selected
> virtual space is occupied by program segments. Therefore,
> error path should not blindly unmap all memmory segments
> but only those already mapped.
>
> Steps that lead to crash:
> 1. memeseg 0 in secondary process overlaps
>     with libc.so
> 2. mmap of /dev/zero fails for virtual space of memseg 0
> 3. munmap of memseg 0 leads to unmapping libc.so itself
> 4. app gets SIGSEGV after returning from syscall to libc
>
> Fixes: ea329d7f8e34 ("mem: fix leak after mapping failure")
>
> Signed-off-by: Maciej Czekaj <maciej.czekaj at caviumnetworks.com>
> ---
>   lib/librte_eal/linuxapp/eal/eal_memory.c | 11 ++++++-----
>   1 file changed, 6 insertions(+), 5 deletions(-)

Acked-by: Sergio Gonzalez Monroy <sergio.gonzalez.monroy at intel.com>