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Use syscall directly in write_validate to avoid ASAN errors

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ASAN will complain about this write call with the following error:

ERROR: AddressSanitizer: stack-buffer-underflow on address
HINT: this may be a false positive if your program uses some custom stack unwind mechanism or swapcontext

This is similar to what google's abseil does to work around the issue.

Reported-by: qiwang@fb.com
This commit is contained in:
Dave Watson 2018-01-17 08:04:05 -08:00
parent e1ca874882
commit 7d6cc6696a
2 changed files with 6 additions and 2 deletions
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4
src/s390x/Ginit.c
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@ -35,6 +35,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/syscall.h>
#include "unwind_i.h"
@ -131,7 +132,8 @@ write_validate (void *addr)
do
{
ret = write (mem_validate_pipe[1], addr, 1);
/* use syscall insteadof write() so that ASAN does not complain */
ret = syscall (SYS_write, mem_validate_pipe[1], addr, 1);
}
while ( errno == EINTR );

4
src/x86_64/Ginit.c
View file

@ -34,6 +34,7 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/syscall.h>
#include "unwind_i.h"
@ -107,7 +108,8 @@ write_validate (void *addr)
do
{
ret = write (mem_validate_pipe[1], addr, 1);
/* use syscall insteadof write() so that ASAN does not complain */
ret = syscall (SYS_write, mem_validate_pipe[1], addr, 1);
}
while ( errno == EINTR );