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SubjectRe: [PATCH 1/1] security: introduce fs caps
Quoting Bill O'Donnell (billodo@sgi.com):
> 8102 execve("/sbin/setfcaps", ["setfcaps", "cap_net_raw=ep", "/bin/ping"], [/* 67 vars */]) = 0
> 8102 brk(0) = 0x6000000000004000
> 8102 uname({sys="Linux", node="certify", ...}) = 0
> 8102 access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
> 8102 open("/etc/ld.so.cache", O_RDONLY) = 3
> 8102 fstat(3, {st_mode=S_IFREG|0644, st_size=111415, ...}) = 0
> 8102 mmap(NULL, 111415, PROT_READ, MAP_PRIVATE, 3, 0) = 0x200000000004c000
> 8102 close(3) = 0
> 8102 open("/lib/libcap.so.1", O_RDONLY) = 3
> 8102 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0002\0\1\0\0\0\340\25"..., 832) = 832
> 8102 fstat(3, {st_mode=S_IFREG|0755, st_size=22672, ...}) = 0
> 8102 mmap(NULL, 85800, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x2000000000068000
> 8102 madvise(0x2000000000068000, 85800, MADV_SEQUENTIAL|0x1) = 0
> 8102 mprotect(0x2000000000070000, 49152, PROT_NONE) = 0
> 8102 mmap(0x200000000007c000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x4000) = 0x200000000007c000
> 8102 close(3) = 0
> 8102 open("/lib/libc.so.6.1", O_RDONLY) = 3
> 8102 read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0002\0\1\0\0\0\3609\2"..., 832) = 832
> 8102 fstat(3, {st_mode=S_IFREG|0755, st_size=2590313, ...}) = 0
> 8102 mmap(NULL, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x2000000000080000
> 8102 mmap(NULL, 2416624, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x2000000000084000
> 8102 madvise(0x2000000000084000, 2416624, MADV_SEQUENTIAL|0x1) = 0
> 8102 mprotect(0x20000000002bc000, 49152, PROT_NONE) = 0
> 8102 mmap(0x20000000002c8000, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x234000) = 0x20000000002c8000
> 8102 mmap(0x20000000002d0000, 8176, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x20000000002d0000
> 8102 close(3) = 0
> 8102 mmap(NULL, 32768, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x20000000002d4000
> 8102 mmap(NULL, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x20000000002dc000
> 8102 munmap(0x200000000004c000, 111415) = 0
> 8102 brk(0) = 0x6000000000004000
> 8102 brk(0x6000000000028000) = 0x6000000000028000
> 8102 capget(0x19980330, 0, {0, 0, 0}) = -1 EINVAL (Invalid argument)

I don't see why this capget is returning -EINVAL. In fact I don't see
why it happens at all - cap_inode_setxattr would check
capable(CAP_SYS_ADMIN), but setxattr hasn't been called yet. Looking at
both libcap and setfcaps.c, I don't see where the capget comes from.

As for the -EINVAL, kernel/capability.c:sys_capget() returns -EINVAL if
the _LINUX_CAPABILITY_VERSION is wrong - you have 0x19980330 which is
correct - if pid < 0 - but you send in 0 - or if security_capget
returns -EINVAL, which cap_capget (and dummy_capget) don't do.

Kaigai, do you have any ideas?

thanks,
-serge
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