[v2] nss: Get rid of alloca usage in db-XXX
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redhat-pt-bot/TryBot-apply_patch |
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redhat-pt-bot/TryBot-32bit |
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linaro-tcwg-bot/tcwg_glibc_build--master-aarch64 |
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linaro-tcwg-bot/tcwg_glibc_check--master-arm |
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Commit Message
Replace alloca usage with a scratch_buffer.
---
nss/nss_db/db-XXX.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
Comments
On Sep 27 2023, Joe Simmons-Talbott wrote:
> @@ -160,7 +163,14 @@ enum nss_status \
> else \
> { \
> const size_t size = (keysize) + 1; \
> - key = alloca (size); \
> + if (!scratch_buffer_set_array_size (&sbuf, 1, size)) \
> + { \
> + *errnop = ENOMEM; \
> + H_ERRNO_SET (NETDB_INTERNAL); \
> + status = NSS_STATUS_TRYAGAIN; \
> + goto out; \
The backslash is not aligned. Ok with that change.
On Sep 27 2023, Joe Simmons-Talbott wrote:
> @@ -160,7 +163,14 @@ enum nss_status \
> else \
> { \
> const size_t size = (keysize) + 1; \
> - key = alloca (size); \
> + if (!scratch_buffer_set_array_size (&sbuf, 1, size)) \
> + { \
> + *errnop = ENOMEM; \
One more change: this should be errno, not ENOMEM.
On Thu, Sep 28, 2023 at 01:19:30PM +0200, Andreas Schwab wrote:
> On Sep 27 2023, Joe Simmons-Talbott wrote:
>
> > @@ -160,7 +163,14 @@ enum nss_status \
> > else \
> > { \
> > const size_t size = (keysize) + 1; \
> > - key = alloca (size); \
> > + if (!scratch_buffer_set_array_size (&sbuf, 1, size)) \
> > + { \
> > + *errnop = ENOMEM; \
>
> One more change: this should be errno, not ENOMEM.
Thanks for the review. I've posted a v3 with both changes.
Thanks,
Joe
@@ -18,6 +18,7 @@
#include <dlfcn.h>
#include <fcntl.h>
+#include <scratch_buffer.h>
#include <stdint.h>
#include <sys/mman.h>
#include <libc-lock.h>
@@ -126,6 +127,8 @@ enum nss_status \
char *buffer, size_t buflen, int *errnop H_ERRNO_PROTO)\
{ \
struct parser_data *data = (void *) buffer; \
+ struct scratch_buffer sbuf; \
+ scratch_buffer_init (&sbuf); \
\
if (buflen < sizeof *data) \
{ \
@@ -160,7 +163,14 @@ enum nss_status \
else \
{ \
const size_t size = (keysize) + 1; \
- key = alloca (size); \
+ if (!scratch_buffer_set_array_size (&sbuf, 1, size)) \
+ { \
+ *errnop = ENOMEM; \
+ H_ERRNO_SET (NETDB_INTERNAL); \
+ status = NSS_STATUS_TRYAGAIN; \
+ goto out; \
+ } \
+ key = sbuf.data; \
\
KEYPRINTF keypattern; \
} \
@@ -216,6 +226,7 @@ enum nss_status \
\
out: \
internal_endent (&state); \
+ scratch_buffer_free (&sbuf); \
\
return status; \
}