elf: Do not duplicate the GLIBC_TUNABLES string

The tunable parsing duplicates the tunable environment variable so it
null-terminates each one since it simplifies the later parsing. It has
the drawback of adding another point of failure (__minimal_malloc
failing), and the memory copy requires tuning the compiler to avoid mem
operations calls.

The parsing now tracks the tunable start and its size. The
dl-tunable-parse.h adds helper functions to help parsing, like a strcmp
that also checks for size and an iterator for suboptions that are
comma-separated (used on hwcap parsing by x86, powerpc, and s390x).

Since the environment variable is allocated on the stack by the kernel,
it is safe to keep the references to the suboptions for later parsing
of string tunables (as done by set_hwcaps by multiple architectures).

Checked on x86_64-linux-gnu, powerpc64le-linux-gnu, and
aarch64-linux-gnu.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

1 files changed, 20 insertions, 13 deletions

diff --git a/sysdeps/unix/sysv/linux/aarch64/cpu-features.c b/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
index a11a86efab..c57f154b48 100644
--- a/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
+++ b/sysdeps/unix/sysv/linux/aarch64/cpu-features.c
@@ -16,10 +16,12 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
+#include <array_length.h>
 #include <cpu-features.h>
 #include <sys/auxv.h>
 #include <elf/dl-hwcaps.h>
 #include <sys/prctl.h>
+#include <dl-tunables-parse.h>
 
 #define DCZID_DZP_MASK (1 << 4)
 #define DCZID_BS_MASK (0xf)
@@ -33,25 +35,28 @@
 struct cpu_list
 {
   const char *name;
+  size_t len;
   uint64_t midr;
 };
 
-static struct cpu_list cpu_list[] = {
-      {"thunderxt88",	 0x430F0A10},
-      {"thunderx2t99",   0x431F0AF0},
-      {"thunderx2t99p1", 0x420F5160},
-      {"ares",		 0x411FD0C0},
-      {"emag",		 0x503F0001},
-      {"kunpeng920", 	 0x481FD010},
-      {"a64fx",		 0x460F0010},
-      {"generic", 	 0x0}
+static const struct cpu_list cpu_list[] =
+{
+#define CPU_LIST_ENTRY(__str, __num) { __str, sizeof (__str) - 1, __num }
+  CPU_LIST_ENTRY ("thunderxt88",    0x430F0A10),
+  CPU_LIST_ENTRY ("thunderx2t99",   0x431F0AF0),
+  CPU_LIST_ENTRY ("thunderx2t99p1", 0x420F5160),
+  CPU_LIST_ENTRY ("ares",           0x411FD0C0),
+  CPU_LIST_ENTRY ("emag",           0x503F0001),
+  CPU_LIST_ENTRY ("kunpeng920",     0x481FD010),
+  CPU_LIST_ENTRY ("a64fx",          0x460F0010),
+  CPU_LIST_ENTRY ("generic",        0x0),
 };
 
 static uint64_t
-get_midr_from_mcpu (const char *mcpu)
+get_midr_from_mcpu (const struct tunable_str_t *mcpu)
 {
-  for (int i = 0; i < sizeof (cpu_list) / sizeof (struct cpu_list); i++)
-    if (strcmp (mcpu, cpu_list[i].name) == 0)
+  for (int i = 0; i < array_length (cpu_list); i++)
+    if (tunable_strcmp (mcpu, cpu_list[i].name, cpu_list[i].len))
       return cpu_list[i].midr;
 
   return UINT64_MAX;
@@ -63,7 +68,9 @@ init_cpu_features (struct cpu_features *cpu_features)
   register uint64_t midr = UINT64_MAX;
 
   /* Get the tunable override.  */
-  const char *mcpu = TUNABLE_GET (glibc, cpu, name, const char *, NULL);
+  const struct tunable_str_t *mcpu = TUNABLE_GET (glibc, cpu, name,
+						  struct tunable_str_t *,
+						  NULL);
   if (mcpu != NULL)
     midr = get_midr_from_mcpu (mcpu);