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module: make module_address_lookup safe

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module_address_lookup releases preemption then returns a pointer into
the module space.  The only user (kallsyms) copies the result, so just
do that under the preempt disable.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2008-01-29 17:13:22 -05:00
parent bb9d3d56e7
commit 6dd06c9fbe
3 changed files with 30 additions and 25 deletions
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11
kernel/kallsyms.c
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@@ -233,10 +233,11 @@ static unsigned long get_symbol_pos(unsigned long addr,
int kallsyms_lookup_size_offset(unsigned long addr, unsigned long *symbolsize,
unsigned long *offset)
{
char namebuf[KSYM_NAME_LEN];
if (is_ksym_addr(addr))
return !!get_symbol_pos(addr, symbolsize, offset);
return !!module_address_lookup(addr, symbolsize, offset, NULL);
return !!module_address_lookup(addr, symbolsize, offset, NULL, namebuf);
}
/*
@@ -251,8 +252,6 @@ const char *kallsyms_lookup(unsigned long addr,
unsigned long *offset,
char **modname, char *namebuf)
{
const char *msym;
namebuf[KSYM_NAME_LEN - 1] = 0;
namebuf[0] = 0;
@@ -268,10 +267,8 @@ const char *kallsyms_lookup(unsigned long addr,
}
/* see if it's in a module */
msym = module_address_lookup(addr, symbolsize, offset, modname);
if (msym)
return strncpy(namebuf, msym, KSYM_NAME_LEN - 1);
return module_address_lookup(addr, symbolsize, offset, modname,
namebuf);
return NULL;
}