* [LTP] [PATCH v2] syscalls/sockioctl: Make buf a struct ifreq array
@ 2023-03-27 11:02 Teo Couprie Diaz
2023-03-28 2:50 ` Li Wang
2023-05-12 11:48 ` Cyril Hrubis
0 siblings, 2 replies; 5+ messages in thread
From: Teo Couprie Diaz @ 2023-03-27 11:02 UTC (permalink / raw)
To: ltp
In setup3, the following line can lead to an undefined behavior:
ifr = *(struct ifreq *)ifc.ifc_buf;
Indeed, at this point it can be assumed that ifc.ifc_buf is suitably
aligned for struct ifreq.
However, ifc.ifc_buf is assigned to buf, a char array, which has no
alignment constraints. This means there exists cases where buf is not
suitably aligned to load a struct ifreq, which can generate a SIGBUS.
Change buf from a char to a struct ifreq array, as it isn't used for
anything else in this test.
This guarantees that buff will be properly aligned.
Signed-off-by: Teo Couprie Diaz <teo.coupriediaz@arm.com>
---
I changed the cast from Cyril suggestion from (void*) to (char*) just
to be consistent with the type of (struct ifconf).ifc_buf.
From my understanding this should be equivalent.
v2:
- As per Cyril comments, make buf a struct ifreq array rather than
align it with __attribute__
- Update commit message accordingly
CI Build: https://github.com/Teo-CD/ltp/actions/runs/4531482995
testcases/kernel/syscalls/sockioctl/sockioctl01.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/testcases/kernel/syscalls/sockioctl/sockioctl01.c b/testcases/kernel/syscalls/sockioctl/sockioctl01.c
index 51dac9c16309..ff3738f327ef 100644
--- a/testcases/kernel/syscalls/sockioctl/sockioctl01.c
+++ b/testcases/kernel/syscalls/sockioctl/sockioctl01.c
@@ -52,7 +52,7 @@ static struct ifreq ifr;
static int sinlen;
static int optval;
-static char buf[8192];
+static struct ifreq buf[200];
static void setup(void);
static void setup0(void);
@@ -218,7 +218,7 @@ static void setup2(void)
s = SAFE_SOCKET(cleanup, tdat[testno].domain, tdat[testno].type,
tdat[testno].proto);
ifc.ifc_len = sizeof(buf);
- ifc.ifc_buf = buf;
+ ifc.ifc_buf = (char *)buf;
}
static void setup3(void)
--
2.34.1
--
Mailing list info: https://lists.linux.it/listinfo/ltp
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [LTP] [PATCH v2] syscalls/sockioctl: Make buf a struct ifreq array
2023-03-27 11:02 [LTP] [PATCH v2] syscalls/sockioctl: Make buf a struct ifreq array Teo Couprie Diaz
@ 2023-03-28 2:50 ` Li Wang
2023-05-05 16:57 ` Petr Vorel
2023-05-12 11:48 ` Cyril Hrubis
1 sibling, 1 reply; 5+ messages in thread
From: Li Wang @ 2023-03-28 2:50 UTC (permalink / raw)
To: Teo Couprie Diaz; +Cc: ltp
LGTM.
Reviewed-by: Li Wang <liwang@redhat.com>
--
Regards,
Li Wang
--
Mailing list info: https://lists.linux.it/listinfo/ltp
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [LTP] [PATCH v2] syscalls/sockioctl: Make buf a struct ifreq array
2023-03-28 2:50 ` Li Wang
@ 2023-05-05 16:57 ` Petr Vorel
0 siblings, 0 replies; 5+ messages in thread
From: Petr Vorel @ 2023-05-05 16:57 UTC (permalink / raw)
To: Li Wang; +Cc: ltp
Hi all,
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Kind regards,
Petr
--
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [LTP] [PATCH v2] syscalls/sockioctl: Make buf a struct ifreq array
2023-03-27 11:02 [LTP] [PATCH v2] syscalls/sockioctl: Make buf a struct ifreq array Teo Couprie Diaz
2023-03-28 2:50 ` Li Wang
@ 2023-05-12 11:48 ` Cyril Hrubis
2023-05-12 12:25 ` Petr Vorel
1 sibling, 1 reply; 5+ messages in thread
From: Cyril Hrubis @ 2023-05-12 11:48 UTC (permalink / raw)
To: Teo Couprie Diaz; +Cc: ltp
Hi!
Reviewed-by: Cyril Hrubis <chrubis@suse.cz>
--
Cyril Hrubis
chrubis@suse.cz
--
Mailing list info: https://lists.linux.it/listinfo/ltp
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [LTP] [PATCH v2] syscalls/sockioctl: Make buf a struct ifreq array
2023-05-12 11:48 ` Cyril Hrubis
@ 2023-05-12 12:25 ` Petr Vorel
0 siblings, 0 replies; 5+ messages in thread
From: Petr Vorel @ 2023-05-12 12:25 UTC (permalink / raw)
To: Cyril Hrubis; +Cc: ltp
Hi all,
thanks, merged!
Kind regards,
Petr
--
Mailing list info: https://lists.linux.it/listinfo/ltp
^ permalink raw reply [flat|nested] 5+ messages in thread
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2023-03-27 11:02 [LTP] [PATCH v2] syscalls/sockioctl: Make buf a struct ifreq array Teo Couprie Diaz
2023-03-28 2:50 ` Li Wang
2023-05-05 16:57 ` Petr Vorel
2023-05-12 11:48 ` Cyril Hrubis
2023-05-12 12:25 ` Petr Vorel
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