Re: [PATCH] kdb: use memmove instead of overlapping memcpy

[Jason Wessel]

On 02/02/2018 08:59 AM, Arnd Bergmann wrote:

gcc discovered that the memcpy() arguments in kdbnearsym() overlap, so
we should really use memmove(), which is defined to handle that correctly:

In function 'memcpy',
 inlined from 'kdbnearsym' at 
/git/arm-soc/kernel/debug/kdb/kdb_support.c:132:4:
/git/arm-soc/include/linux/string.h:353:9: error: '__builtin_memcpy' accessing 
792 bytes at offsets 0 and 8 overlaps 784 bytes at offset 8 [-Werror=restrict]
   return __builtin_memcpy(p, q, size);

Signed-off-by: Arnd Bergmann 
---
  kernel/debug/kdb/kdb_support.c | 4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/debug/kdb/kdb_support.c b/kernel/debug/kdb/kdb_support.c
index 5d8ef3a07ecd..1ad4370ccbf0 100644
--- a/kernel/debug/kdb/kdb_support.c
+++ b/kernel/debug/kdb/kdb_support.c
@@ -129,13 +129,13 @@ int kdbnearsym(unsigned long addr, kdb_symtab_t *symtab)
}
if (i >= ARRAY_SIZE(kdb_name_table)) {
debug_kfree(kdb_name_table[0]);
-   memcpy(kdb_name_table, kdb_name_table+1,
+   memmove(kdb_name_table, kdb_name_table+1,
   sizeof(kdb_name_table[0]) *
   (ARRAY_SIZE(kdb_name_table)-1));
} else {
debug_kfree(knt1);
knt1 = kdb_name_table[i];
-   memcpy(kdb_name_table+i, kdb_name_table+i+1,
+   memmove(kdb_name_table+i, kdb_name_table+i+1,
   sizeof(kdb_name_table[0]) *
   (ARRAY_SIZE(kdb_name_table)-i-1));
}




That is good by me.   Many thanks!  Added to queue.

Reviewed-by: Jason Wessel 

Jason.

Re: [PATCH] kdb: use memmove instead of overlapping memcpy

[Jason Wessel]

On 02/02/2018 08:59 AM, Arnd Bergmann wrote:

gcc discovered that the memcpy() arguments in kdbnearsym() overlap, so
we should really use memmove(), which is defined to handle that correctly:

In function 'memcpy',
 inlined from 'kdbnearsym' at 
/git/arm-soc/kernel/debug/kdb/kdb_support.c:132:4:
/git/arm-soc/include/linux/string.h:353:9: error: '__builtin_memcpy' accessing 
792 bytes at offsets 0 and 8 overlaps 784 bytes at offset 8 [-Werror=restrict]
   return __builtin_memcpy(p, q, size);

Signed-off-by: Arnd Bergmann 
---
  kernel/debug/kdb/kdb_support.c | 4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/debug/kdb/kdb_support.c b/kernel/debug/kdb/kdb_support.c
index 5d8ef3a07ecd..1ad4370ccbf0 100644
--- a/kernel/debug/kdb/kdb_support.c
+++ b/kernel/debug/kdb/kdb_support.c
@@ -129,13 +129,13 @@ int kdbnearsym(unsigned long addr, kdb_symtab_t *symtab)
}
if (i >= ARRAY_SIZE(kdb_name_table)) {
debug_kfree(kdb_name_table[0]);
-   memcpy(kdb_name_table, kdb_name_table+1,
+   memmove(kdb_name_table, kdb_name_table+1,
   sizeof(kdb_name_table[0]) *
   (ARRAY_SIZE(kdb_name_table)-1));
} else {
debug_kfree(knt1);
knt1 = kdb_name_table[i];
-   memcpy(kdb_name_table+i, kdb_name_table+i+1,
+   memmove(kdb_name_table+i, kdb_name_table+i+1,
   sizeof(kdb_name_table[0]) *
   (ARRAY_SIZE(kdb_name_table)-i-1));
}




That is good by me.   Many thanks!  Added to queue.

Reviewed-by: Jason Wessel 

Jason.

[PATCH] kdb: use memmove instead of overlapping memcpy

[Arnd Bergmann]

gcc discovered that the memcpy() arguments in kdbnearsym() overlap, so
we should really use memmove(), which is defined to handle that correctly:

In function 'memcpy',
inlined from 'kdbnearsym' at 
/git/arm-soc/kernel/debug/kdb/kdb_support.c:132:4:
/git/arm-soc/include/linux/string.h:353:9: error: '__builtin_memcpy' accessing 
792 bytes at offsets 0 and 8 overlaps 784 bytes at offset 8 [-Werror=restrict]
  return __builtin_memcpy(p, q, size);

Signed-off-by: Arnd Bergmann 
---
 kernel/debug/kdb/kdb_support.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/debug/kdb/kdb_support.c b/kernel/debug/kdb/kdb_support.c
index 5d8ef3a07ecd..1ad4370ccbf0 100644
--- a/kernel/debug/kdb/kdb_support.c
+++ b/kernel/debug/kdb/kdb_support.c
@@ -129,13 +129,13 @@ int kdbnearsym(unsigned long addr, kdb_symtab_t *symtab)
}
if (i >= ARRAY_SIZE(kdb_name_table)) {
debug_kfree(kdb_name_table[0]);
-   memcpy(kdb_name_table, kdb_name_table+1,
+   memmove(kdb_name_table, kdb_name_table+1,
   sizeof(kdb_name_table[0]) *
   (ARRAY_SIZE(kdb_name_table)-1));
} else {
debug_kfree(knt1);
knt1 = kdb_name_table[i];
-   memcpy(kdb_name_table+i, kdb_name_table+i+1,
+   memmove(kdb_name_table+i, kdb_name_table+i+1,
   sizeof(kdb_name_table[0]) *
   (ARRAY_SIZE(kdb_name_table)-i-1));
}
-- 
2.9.0

[PATCH] kdb: use memmove instead of overlapping memcpy

[Arnd Bergmann]

gcc discovered that the memcpy() arguments in kdbnearsym() overlap, so
we should really use memmove(), which is defined to handle that correctly:

In function 'memcpy',
inlined from 'kdbnearsym' at 
/git/arm-soc/kernel/debug/kdb/kdb_support.c:132:4:
/git/arm-soc/include/linux/string.h:353:9: error: '__builtin_memcpy' accessing 
792 bytes at offsets 0 and 8 overlaps 784 bytes at offset 8 [-Werror=restrict]
  return __builtin_memcpy(p, q, size);

Signed-off-by: Arnd Bergmann 
---
 kernel/debug/kdb/kdb_support.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/debug/kdb/kdb_support.c b/kernel/debug/kdb/kdb_support.c
index 5d8ef3a07ecd..1ad4370ccbf0 100644
--- a/kernel/debug/kdb/kdb_support.c
+++ b/kernel/debug/kdb/kdb_support.c
@@ -129,13 +129,13 @@ int kdbnearsym(unsigned long addr, kdb_symtab_t *symtab)
}
if (i >= ARRAY_SIZE(kdb_name_table)) {
debug_kfree(kdb_name_table[0]);
-   memcpy(kdb_name_table, kdb_name_table+1,
+   memmove(kdb_name_table, kdb_name_table+1,
   sizeof(kdb_name_table[0]) *
   (ARRAY_SIZE(kdb_name_table)-1));
} else {
debug_kfree(knt1);
knt1 = kdb_name_table[i];
-   memcpy(kdb_name_table+i, kdb_name_table+i+1,
+   memmove(kdb_name_table+i, kdb_name_table+i+1,
   sizeof(kdb_name_table[0]) *
   (ARRAY_SIZE(kdb_name_table)-i-1));
}
-- 
2.9.0